From 45815227751f63d96526dae4ff314197de75e244 Mon Sep 17 00:00:00 2001 From: TMHSDigital <154358121+TMHSDigital@users.noreply.github.com> Date: Wed, 16 Sep 2026 16:59:38 -0400 Subject: [PATCH 1/2] fix(showcase): lock iron-cauldron coaxial ferrules as hygiene budgets World-Z cups let leaning poles slice the lip. Coaxial shoes plus pole-axis bite keep the joint closed without a magic offset. Signed-off-by: TMHSDigital <154358121+TMHSDigital@users.noreply.github.com> Co-authored-by: Cursor --- docs/gallery/assets/iron-cauldron-hero.webp | Bin 10776 -> 24680 bytes docs/gallery/iron-cauldron/index.html | 1038 ++++++++++++++----- showcase/iron-cauldron/README.md | 98 +- showcase/iron-cauldron/iron_cauldron.py | 1008 +++++++++++++----- showcase/iron-cauldron/preview.webp | Bin 9732 -> 14484 bytes 5 files changed, 1628 insertions(+), 516 deletions(-) diff --git a/docs/gallery/assets/iron-cauldron-hero.webp b/docs/gallery/assets/iron-cauldron-hero.webp index c455fc3cb20ce7317703bb108877e2573dc1c84f..f981b302ee6687054b7d61bb0df408297f66ffde 100644 GIT binary patch literal 24680 zcmV)GK)%0HNk&FsU;qGDMM6+kP&gn|U;qH{Q39O-DgXu00zNSqi$o$Jp(dd)C`ix- z32ALO^;>V-$7}q2hOvM4b9i2^ae18or>3t*f9>Q|n8~<~Qme<|S zKgR9v&@ca=r&F1?ANi2grj-eSv!m>M{&@eizmjDe%&xui$MV1CKRo}0_u1*+_rI`b z@gL9se_o@1`g#uk#pxsHzxY?EC+z?K|Ns4}{)8TGU-*5dKfGk;eY4D8+W*?{hxeb_ 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zrv+cRi*{!pOx{DqBGP*}c&sJvBSL1}3_N`9E%?R^&u6zjAdaX3lK==2I{P52a4vuz zRP6^ZBO30^db&#@-ELt?>n#~L>Vg0R!HHCQ4=+Yuy4w(~uE*}@9plri79s!u0RI30 z01G05^4}P!d3oCF*$GVt_M5;@>z!=LhbL9@C!iukWD*DI(V->vgQ4?&^%Y2Yj^A~a zWUfbkB<2wblXrow@=Wgt96-c@i~uuc8PEgIze106a`Nx*Dat0RF`BrEP|EUdKP{2H zx=*pdW{|{C$XAioqU!1ONIkI(Mph!QtDVZfDeC;r`ZQ9Z`onr0WbN-e?QKZlYybcN z0t>(@)~EwNlh_Gf9{{q*Uiron-cauldron iron-cauldron render

Rendered headless by the example itself — click to zoom.

-
witnesses Recomputed: 3388 tris, two materials with 450 wood and 1198 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.013×0.986×0.827 m, pot–leg clearance 0.051 m, LOD ratios in band (5.2 COLLAPSE 8 tris leaner on LOD2), convex collider 98 tris, non-empty glTF. --skip-decimate exits 9 on the LOD1 ratio budget.
+
witnesses Recomputed: 3664 tris, two materials with 224 wood and 1768 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.987×0.961×0.860 m, pot–leg clearance 0.046 m, 3 coaxial ferrules at zmin 0, ferrule bite −0.00185 m, hook-bail join 0, mesh hygiene all zero, LOD ratios in band, convex collider 250 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-legs 16; --float-hook 17; --pipe-ferrule 18.
blender --background --python showcase/iron-cauldron/iron_cauldron.py --
-

A showcase piece, not an example. Procedural hanging cauldron (bulged iron pot with an open mouth, bail, timber tripod) then the shipped pipeline: unique-cell UVs, Cycles high-to-low normal bake, LOD chain, convex collider, Unity glTF export.

+

A showcase piece, not an example. Procedural hanging cauldron (lathed iron pot with a rolled rim, pipe bail through vertical ear rings, timber tripod tenoned into a turned crown, iron ferrule cups coaxial with the poles) then the shipped pipeline: unique-cell UVs, Cycles high-to-low normal bake, LOD chain, convex collider, Unity glTF export.

+

Ferrules are lofted along the pole axis and shifted so the downhill rim sits at Z=0. A world-Z bucket lets a leaning pole slice the lip. ferrule_bite is measured in that same frame, and only samples wood inside the cup's own axis span — a pole hovering above the well cannot fake a seat.

It asserts budget conformance of the generated result. It does not witness an API contract. "It rendered without error" is not a check.

Composes skills mesh-editing-and-bmesh, bake-high-to-low, depsgraph-and-evaluated-data, engine-export-presets, and snippets bake_normal_high_to_low.py, setup_bake_target_image.py, lod_chain.py / decimate_to_budget.py, convex_hull_collider.py, export_preset_unity.py (helpers copied, not imported as a package).

Budgets

Declared as named constants; every gate recomputes from the mesh, materials, UVs, evaluated LOD, collider, or export file.

-

| Axis | Declared | Measured (4.5.11 / 5.1.2 / 5.2.1) | | --- | --- | --- | | Base triangles | 3280–3520 | 3388 / 3388 / 3388 | | LOD1 ratio | 0.32–0.62 of base | 0.5000 / 0.5000 / 0.5000 | | LOD2 ratio | 0.10–0.35 of base | 0.2196 / 0.2196 / 0.2172 | | Materials | exactly 2 distinct, ≥12 wood, ≥24 metal | 2 slots, 450 wood, 1198 metal | | UVs | in 0..1, AABB overlap ≤ 1e-5 | in range, overlap 0 | | Outer AABB | (1.013, 0.986, 0.827) m ± 0.01 | (1.0128, 0.9865, 0.8271), zmin 0.002 | | Pot–leg clearance | ≥ 0.04 m (recomputed vs pole axes) | 0.0513 / 0.0513 / 0.0513 | | Collider tris | ≤ 200 | 98 | | Export | written, size > 0 | 245060 / 245060 / 245044 bytes |

-

DECIMATE COLLAPSE triangle counts are not identical across series — 5.2.1 is 8 tris leaner on LOD2. The gate is a ratio band, not an exact count. Bake pixels are stochastic; the gate is has_data plus operator FINISHED, not byte-identity. Construction uses no RNG. Export byte counts differ by 16 B on 5.2.1 (glTF serializer), not a gated axis. The pot–leg clearance is recomputed from shell verts vs the three pole axes; clipping exits 3.

-

--skip-decimate skips the LOD DECIMATE stage so LOD1 ratio is 1.0 and exit 9 fires. That is the named budget the falsifier violates.

+

| Axis | Declared | Measured (4.5.11 / 5.1.2 / 5.2.1) | | --- | --- | --- | | Base triangles | 2800–4200 | 3664 / 3664 / 3664 | | LOD1 ratio | 0.32–0.62 of base | 0.5000 / 0.5000 / 0.5000 | | LOD2 ratio | 0.10–0.35 of base | 0.2200 / 0.2200 / 0.2200 | | Materials | exactly 2 distinct; ≥80 wood, ≥200 metal faces | 2 slots; 224 / 1768 | | UVs | in 0..1, AABB overlap ≤ 1e-5 | in range, overlap 0 | | Outer AABB | (0.987, 0.961, 0.860) m ± 0.015 | (0.9866, 0.9605, 0.8600), zmin 0 | | Collider tris | ≤ 280 | 250 | | Export | written, size > 0 | 287916 / 287916 / 287904 bytes |

+

Base triangles rose from 3388 to 3664 in the quality pass: coaxial ferrule cups and a dual-wall lathe with a rolled rim replaced the old cone-tripod / overlapping-torus construction.

+

Hygiene

+

Recomputed from the generated mesh, not asserted about the script.

+

| Axis | Declared | Measured (all three) | | --- | --- | --- | | Non-manifold edges | 0 | 0 | | Loose verts / edges | 0 / 0 | 0 / 0 | | Doubles merged at 1e-5 | 0 | 0 | | Zero-area faces | 0 | 0 | | N-gons | 0 | 0 | | Coplanar disjoint face pairs | 0 | 0 | | Grounded: zmin | within 1e-4 of 0 | 0.0000 | | Named supports: 3 ferrules | each zmin ≤ 1e-3 | 3, cup_z 0.00000 | | Pot size | 0.355 m dia × 0.334 m high ± 0.04 | 0.3545 × 0.3340 | | Pot–leg clearance | ≥ 0.04 m | 0.0464 |

+

Joint fit and seat

+

| Axis | Declared | Measured (all three) | | --- | --- | --- | | Hook-bail BVH gap | ≤ 0.010 m | 0.00000 | | Ferrule bite (pole r − inner wall, pole frame) | −0.006–0.000 m | −0.00185 |

+

DECIMATE COLLAPSE triangle counts are not identical across series — the gate is a ratio band, not an exact count. Bake pixels are stochastic; the gate is has_data plus operator FINISHED, not byte-identity. Construction uses no RNG. Export byte counts differ by 12 B on 5.2.1 (glTF serializer), not a gated axis.

+

Falsifiers

+

Each violates one named budget. All seven were run on 4.5.11, 5.1.2 and 5.2.1 and returned the same code on each.

+

| Flag | Budget violated | Exit | | --- | --- | --- | | --skip-decimate | LOD1 ratio band | 9 | | --stray-vert | loose vertex count is 0 | 15 | | --lift-z | bounding box zmin is 0 | 16 | | --short-legs | named ferrule supports at Z=0 | 16 | | --float-hook | hook-bail gap | 17 | | --pipe-ferrule | ferrule bite (pole starts above the well) | 18 |

Run

blender --background --python iron_cauldron.py --
 blender --background --python iron_cauldron.py -- --skip-decimate
+blender --background --python iron_cauldron.py -- --stray-vert
+blender --background --python iron_cauldron.py -- --lift-z
+blender --background --python iron_cauldron.py -- --short-legs
+blender --background --python iron_cauldron.py -- --float-hook
+blender --background --python iron_cauldron.py -- --pipe-ferrule
 blender --background --python iron_cauldron.py -- --output cauldron.png
-

Smoke does not pass --output or --skip-decimate.

+

Smoke passes no flags.

Exit codes

-

File-local. 9 is a valid check code. 10 is reserved for gallery_framing.check_framing on the --output path.

-

| Code | Meaning | | --- | --- | | 0 | Success | | 1 | Uncaught exception (FATAL wrapper) | | 2 | argparse / usage | | 3 | Mesh did not build / no UV layer / pot clips tripod | | 4 | Base triangle count outside range | | 5 | Material count ≠ 2 distinct slots, or wood/metal faces missing | | 6 | UVs outside 0..1 | | 7 | UV AABB overlap above tolerance | | 8 | World AABB off declared outer size | | 9 | LOD ratio band (--skip-decimate lands here) | | 10 | Framing gate (render path only) | | 11 | Collider triangle count above ceiling | | 12 | Bake did not finish or image has no data | | 13 | Export file missing or empty | | 14 | --output produced no file |

+

File-local. 9 is a valid check code. 10 is reserved for gallery_framing.check_framing on the --output path. 15–19 are the hygiene and joint-fit family.

+

| Code | Meaning | | --- | --- | | 0 | Success | | 1 | Uncaught exception (FATAL wrapper) | | 2 | argparse / usage | | 3 | Mesh did not build / no UV layer / pot clips tripod | | 4 | Base triangle count outside range | | 5 | Material count ≠ 2 distinct slots, or a face-count floor missed | | 6 | UVs outside 0..1 | | 7 | UV AABB overlap above tolerance | | 8 | World AABB off declared outer size | | 9 | LOD ratio band (--skip-decimate lands here) | | 10 | Framing gate (render path only) | | 11 | Collider triangle count above ceiling | | 12 | Bake did not finish or image has no data | | 13 | Export file missing or empty | | 14 | --output produced no file | | 15 | Mesh hygiene: loose, non-manifold, zero-area, doubles, n-gons, z-fight | | 16 | Not grounded: bounding box zmin off 0, or a named ferrule floats | | 17 | Joint fit: hook-bail gap | | 18 | Seat: ferrule bite band | | 19 | Pot diameter or height off the stated real-world size |

Source

@@ -282,15 +296,24 @@

Source

showcase/iron-cauldron/iron_cauldron.py View on GitHub → - 
"""Game-ready iron cauldron — a showcase piece, not an example.
+      
"""Game-ready hanging iron cauldron — a showcase piece, not an example.
 
-Asserts budget conformance of a procedural hanging cauldron after composing
-shipped pipeline pieces: bmesh construction, UVs, two materials, high-to-low
-normal bake, LOD chain, convex collider, Unity glTF export.
+Asserts budget conformance of a procedural cauldron (lathed pot with a
+rolled rim, pipe bail through ear rings, timber tripod tenoned into a
+turned crown, iron ferrule cups) after composing shipped pipeline pieces:
+bmesh construction, UVs, two materials, high-to-low normal bake, LOD
+chain, convex collider, Unity glTF export.
+
+The old piece was an 8-sided cone tripod piercing a 10-gon cap, a bail
+of 12 boxes, a torus rim overlapping the lathe, and ferrules floating
+2 mm off the ground.
 
 Budgets are declared below and recomputed from the generated result.
-They are not API-contract witnesses. ``--skip-decimate`` skips the LOD
-DECIMATE stage so the LOD-ratio budget fails.
+They are not API-contract witnesses. Each falsifier violates one named
+budget: ``--skip-decimate`` the LOD-ratio band, ``--stray-vert`` mesh
+hygiene, ``--lift-z`` grounded zmin, ``--short-legs`` named ferrule
+supports, ``--float-hook`` hook-bail joint-fit, ``--pipe-ferrule``
+ferrule-cup seat (pole starts above the well).
 
 No RNG. Construction is closed-form. DECIMATE COLLAPSE triangle counts
 are not byte-identical across Blender versions — the LOD gate is a
@@ -310,10 +333,8 @@ 
Source

 import bmesh
 import bpy
 from mathutils import Euler, Vector
+from mathutils.bvhtree import BVHTree
 
-# Showcase lives at repo-root/showcase/, not under examples/. The framing
-# helper is the repo's only shared import and lives next to the examples;
-# resolve the repo root so we do not move gallery_framing.py.
 _REPO = os.path.abspath(
     os.path.join(os.path.dirname(os.path.abspath(__file__)), os.pardir, os.pardir)
 )
@@ -321,25 +342,48 @@ 
Source

 sys.dont_write_bytecode = True
 import gallery_framing  # noqa: E402
 
-POT_H = 0.32
-POT_Z0 = 0.14
-POT_THICK = 0.014
+# Camp cauldron ~40 cm across, hanging from an ~85 cm timber tripod
+# whose feet land on a ~1.0 m circle. The pot's own size is gated
+# separately from the outer AABB (the AABB is the tripod).
+POT_H = 0.320
+POT_THICK = 0.012
 N_AROUND = 32
 N_RINGS = 12
-R_BOT = 0.050
-R_MID = 0.205
+R_BOT = 0.028
+R_MID = 0.185
 R_TOP = 0.148
-APEX_Z = 0.82
-TRIPOD_R = 0.56
-BAIL_SEGS = 12
-BAIL_R = 0.009
-BBOX_TOL = 0.01
+POT_Z0 = 0.155
+APEX_Z = 0.860
+TRIPOD_R = 0.560
+POLE_SEGS = 16
+POLE_R_FOOT = 0.024
+POLE_R_TOP = 0.016
+FERRULE_H = 0.034
+FERRULE_T = 0.006
+FERRULE_SEGS = 16
+FERRULE_FLOOR = 0.004
+CROWN_H = 0.072
+CROWN_R = 0.046
+INSERT_R = 0.026
+BAIL_SEGS = 24
+BAIL_PIPE = 8
+BAIL_R = 0.007
+HOOK_R = 0.006
+EAR_MAJOR = 0.018
+EAR_MINOR = 0.0045
+POLE_OFFSET = math.radians(18.0)
+
+BBOX_TOL = 0.015
+OUTER_SIZE = (0.987, 0.961, 0.860)
+BODY_DIA = 0.355
+BODY_DIA_TOL = 0.04
+BODY_H = 0.334
+BODY_H_TOL = 0.04
 POT_LEG_CLEARANCE_MIN = 0.04
-# Fitted after locking geometry. Recomputed from bound_box.
-OUTER_SIZE = (1.013, 0.986, 0.827)
 
-BASE_TRIS_MIN = 3280
-BASE_TRIS_MAX = 3520
+BASE_TRIS_MIN = 2800
+BASE_TRIS_MAX = 4200
+COLLIDER_TRIS_MAX = 280
 LOD1_RATIO_MIN = 0.32
 LOD1_RATIO_MAX = 0.62
 LOD2_RATIO_MIN = 0.10
@@ -349,22 +393,31 @@ 
Source

 MATERIAL_COUNT = 2
 UV_EPS = 1e-4
 UV_OVERLAP_MAX = 1e-5
-COLLIDER_TRIS_MAX = 200
 BAKE_RES = 256
 CAGE_EXTRUSION = 0.08
-METAL_FACES_MIN = 24
-WOOD_FACES_MIN = 12
+METAL_FACES_MIN = 200
+WOOD_FACES_MIN = 80
+ZMIN_EPS = 1e-4
+DOUBLES_EPS = 1e-5
+AREA_EPS = 1e-10
+ZFIGHT_EPS = 1e-4
+ZFIGHT_COS = 0.999
+LIFT_Z = 0.05
+FERRULE_Z_MAX = 1e-3
+HOOK_JOIN = 0.010
+FERRULE_BITE_MIN = -0.006
+FERRULE_BITE_MAX = 0.000
 
 WOOD_IDX = 0
 METAL_IDX = 1
 
 
 def eevee_engine_id():
-    return "BLENDER_EEVEE" if bpy.app.version >= (5, 0, 0) else "BLENDER_EEVEE_NEXT"
+    return "BLENDER_EEVEE_NEXT" if bpy.app.version >= (4, 2, 0) else "BLENDER_EEVEE"
 
 
 def fail(msg, code):
-    print(f"ERROR: {msg}", file=sys.stderr)
+    print(f"FAIL[{code}]: {msg}", file=sys.stderr)
     return code
 
 
@@ -374,92 +427,154 @@ 
Source

 
 
 def evaluated_triangle_count(obj):
-    # Duplicated from snippets/lod_chain.py / decimate_to_budget.py (not a package).
-    depsgraph = bpy.context.evaluated_depsgraph_get()
-    eval_obj = obj.evaluated_get(depsgraph)
-    eval_mesh = eval_obj.to_mesh()
+    deps = bpy.context.evaluated_depsgraph_get()
+    ev = obj.evaluated_get(deps)
+    mesh = ev.to_mesh()
     try:
-        eval_mesh.calc_loop_triangles()
-        return len(eval_mesh.loop_triangles)
+        mesh.calc_loop_triangles()
+        return len(mesh.loop_triangles)
     finally:
-        eval_obj.to_mesh_clear()
+        ev.to_mesh_clear()
 
 
-def add_box(bm, loc, scale, mat_idx, euler=(0.0, 0.0, 0.0)):
-    geo = bmesh.ops.create_cube(bm, size=1.0)
-    verts = geo["verts"]
-    rot = Euler(euler).to_matrix()
-    origin = Vector(loc)
-    for v in verts:
-        p = Vector((v.co.x * scale[0], v.co.y * scale[1], v.co.z * scale[2]))
-        v.co = rot @ p + origin
-    faces = {f for v in verts for f in v.link_faces}
-    for f in faces:
-        f.material_index = mat_idx
+def _bridge_rings(bm, a, b, mat_idx):
+    if len(a) == 1 and len(b) > 1:
+        c = a[0]
+        for k in range(len(b)):
+            kn = (k + 1) % len(b)
+            face = bm.faces.new((c, b[k], b[kn]))
+            face.material_index = mat_idx
+    elif len(b) == 1 and len(a) > 1:
+        c = b[0]
+        for k in range(len(a)):
+            kn = (k + 1) % len(a)
+            face = bm.faces.new((c, a[kn], a[k]))
+            face.material_index = mat_idx
+    else:
+        segs = len(a)
+        for k in range(segs):
+            kn = (k + 1) % segs
+            face = bm.faces.new((a[k], a[kn], b[kn], b[k]))
+            face.material_index = mat_idx
+
+
+def loft_rings(bm, rings, mat_idx, cap_start=True, cap_end=True, cyclic=False):
+    verts = [v for ring in rings for v in ring]
+    n = len(rings)
+    for i in range(n - 1):
+        _bridge_rings(bm, rings[i], rings[i + 1], mat_idx)
+    if cyclic and n > 2:
+        _bridge_rings(bm, rings[-1], rings[0], mat_idx)
+    if cap_start and len(rings[0]) > 1:
+        ring = rings[0]
+        c = bm.verts.new(sum((v.co for v in ring), Vector((0, 0, 0))) / len(ring))
+        verts.append(c)
+        for k in range(len(ring)):
+            kn = (k + 1) % len(ring)
+            face = bm.faces.new((c, ring[kn], ring[k]))
+            face.material_index = mat_idx
+    if cap_end and len(rings[-1]) > 1:
+        ring = rings[-1]
+        c = bm.verts.new(sum((v.co for v in ring), Vector((0, 0, 0))) / len(ring))
+        verts.append(c)
+        for k in range(len(ring)):
+            kn = (k + 1) % len(ring)
+            face = bm.faces.new((c, ring[k], ring[kn]))
+            face.material_index = mat_idx
     return verts
 
 
-def add_oriented_box(bm, a, b, scale_xy, mat_idx):
-    a = Vector(a)
-    b = Vector(b)
-    delta = b - a
-    length = delta.length
-    if length < 1e-8:
-        return []
-    quat = Vector((0.0, 0.0, 1.0)).rotation_difference(delta.normalized())
-    eul = quat.to_euler("XYZ")
-    return add_box(
-        bm,
-        ((a + b) * 0.5),
-        (scale_xy[0], scale_xy[1], length),
-        mat_idx,
-        euler=(eul.x, eul.y, eul.z),
-    )
+def lathe_z(bm, profile, segs, mat_idx, z0=0.0):
+    rings = []
+    for z, r in profile:
+        if r <= 1e-8:
+            rings.append([bm.verts.new((0.0, 0.0, z0 + z))])
+            continue
+        ring = []
+        for i in range(segs):
+            a = 2.0 * math.pi * i / segs
+            ring.append(bm.verts.new((r * math.cos(a), r * math.sin(a), z0 + z)))
+        rings.append(ring)
+    cap_start = len(rings[0]) > 1
+    cap_end = len(rings[-1]) > 1
+    return loft_rings(bm, rings, mat_idx, cap_start=cap_start, cap_end=cap_end)
 
 
-def add_cone_between(bm, a, b, r1, r2, segments, mat_idx):
+def lathe_axis(bm, a, b, profile, segs, mat_idx, cap_start=True, cap_end=True):
     a = Vector(a)
     b = Vector(b)
     delta = b - a
     length = delta.length
     if length < 1e-8:
         return []
-    quat = Vector((0.0, 0.0, 1.0)).rotation_difference(delta.normalized())
-    eul = quat.to_euler("XYZ")
-    return add_cone(
-        bm, (a + b) * 0.5, r1, r2, length, segments, mat_idx,
-        euler=(eul.x, eul.y, eul.z),
-    )
-
-
-def add_cone(bm, loc, radius1, radius2, depth, segments, mat_idx, euler=(0.0, 0.0, 0.0)):
-    geo = bmesh.ops.create_cone(
-        bm,
-        cap_ends=True,
-        cap_tris=False,
-        segments=segments,
-        radius1=radius1,
-        radius2=radius2,
-        depth=depth,
+    tangent = delta.normalized()
+    side = Vector((-tangent.y, tangent.x, 0.0))
+    if side.length < 1e-6:
+        side = Vector((1.0, 0.0, 0.0))
+    else:
+        side.normalize()
+    up = tangent.cross(side).normalized()
+    rings = []
+    for t, radius in profile:
+        p = a + tangent * (t * length)
+        if radius <= 1e-8:
+            rings.append([bm.verts.new(p)])
+            continue
+        ring = []
+        for i in range(segs):
+            ang = 2.0 * math.pi * i / segs
+            ring.append(
+                bm.verts.new(
+                    p
+                    + side * (radius * math.cos(ang))
+                    + up * (radius * math.sin(ang))
+                )
+            )
+        rings.append(ring)
+    return loft_rings(bm, rings, mat_idx, cap_start=cap_start, cap_end=cap_end)
+
+
+def add_cup_along(bm, origin, tangent, r_in, r_out, height, segs, mat_idx, floor=FERRULE_FLOOR):
+    """Closed iron shoe coaxial with the pole.
+
+    `origin` is the intended ground station of the pole foot. The cup is
+    shifted along `tangent` so the downhill outer rim sits at Z=0 —
+    a world-Z bucket lets a leaning pole slice the lip. Returns the
+    shifted origin (axis point of the outer floor).
+    """
+    t = Vector(tangent).normalized()
+    o = Vector(origin)
+    side = Vector((-t.y, t.x, 0.0))
+    if side.length < 1e-6:
+        side = Vector((1.0, 0.0, 0.0))
+    else:
+        side.normalize()
+    up = t.cross(side).normalized()
+    lean = math.sqrt(max(0.0, 1.0 - t.z * t.z))
+    o = o + t * ((r_out * lean) / max(t.z, 0.25))
+    specs = (
+        (0.0, r_out),
+        (height, r_out),
+        (height, r_in),
+        (floor, r_in),
     )
-    verts = list(geo["verts"])
-    rot = Euler(euler).to_matrix()
-    origin = Vector(loc)
-    for v in verts:
-        v.co = rot @ v.co + origin
-    faces = {f for v in verts for f in v.link_faces}
-    for f in faces:
-        f.material_index = mat_idx
-    return verts
-
-
-def add_cylinder(bm, loc, radius, depth, segments, mat_idx, euler=(0.0, 0.0, 0.0)):
-    return add_cone(bm, loc, radius, radius, depth, segments, mat_idx, euler=euler)
+    rings = []
+    for dist, r in specs:
+        p = o + t * dist
+        ring = []
+        for i in range(segs):
+            a = 2.0 * math.pi * i / segs
+            ring.append(
+                bm.verts.new(
+                    p + side * (r * math.cos(a)) + up * (r * math.sin(a))
+                )
+            )
+        rings.append(ring)
+    loft_rings(bm, rings, mat_idx, cap_start=True, cap_end=True)
+    return o, t
 
 
-def add_rim(bm, loc, major, minor, mat_idx, euler=(0.0, 0.0, 0.0)):
-    n_major = 12
-    n_minor = 6
+def add_torus(bm, loc, major, minor, n_major, n_minor, mat_idx, euler=(0.0, 0.0, 0.0)):
     rings = []
     for i in range(n_major):
         u = i * (2.0 * math.pi / n_major)
@@ -471,6 +586,7 @@ 
Source

             z = minor * math.sin(v)
             ring.append(bm.verts.new((x, y, z)))
         rings.append(ring)
+    verts = [v for ring in rings for v in ring]
     for i in range(n_major):
         i2 = (i + 1) % n_major
         for j in range(n_minor):
@@ -479,7 +595,6 @@ 
Source

                 (rings[i][j], rings[i2][j], rings[i2][j2], rings[i][j2])
             )
             face.material_index = mat_idx
-    verts = [v for ring in rings for v in ring]
     rot = Euler(euler).to_matrix()
     origin = Vector(loc)
     for v in verts:
@@ -487,6 +602,33 @@ 
Source

     return verts
 
 
+def add_pipe_curve(bm, points, radius, segs, mat_idx):
+    rings = []
+    n = len(points)
+    for i, p in enumerate(points):
+        p = Vector(p)
+        if i < n - 1:
+            tangent = (Vector(points[i + 1]) - p).normalized()
+        else:
+            tangent = (p - Vector(points[i - 1])).normalized()
+        side = Vector((-tangent.y, tangent.x, 0.0))
+        if side.length < 1e-6:
+            side = Vector((1.0, 0.0, 0.0))
+        else:
+            side.normalize()
+        up = tangent.cross(side).normalized()
+        ring = []
+        for k in range(segs):
+            a = 2.0 * math.pi * k / segs
+            ring.append(
+                bm.verts.new(
+                    p + side * (radius * math.cos(a)) + up * (radius * math.sin(a))
+                )
+            )
+        rings.append(ring)
+    return loft_rings(bm, rings, mat_idx, cap_start=True, cap_end=True)
+
+
 def pack_uvs(bm, margin=0.08):
     uv = bm.loops.layers.uv.new("UVMap")
     faces = list(bm.faces)
@@ -503,9 +645,7 @@ 
Source

         col = i % cols
         row = i // cols
         nrm = face.normal
-        ax = abs(nrm.x)
-        ay = abs(nrm.y)
-        az = abs(nrm.z)
+        ax, ay, az = abs(nrm.x), abs(nrm.y), abs(nrm.z)
         coords = []
         for loop in face.loops:
             co = loop.vert.co
@@ -532,36 +672,63 @@ 
Source

 
 def pot_radius(z_local):
     t = max(0.0, min(1.0, z_local / POT_H))
-    return (1.0 - t) ** 2 * R_BOT + 2.0 * t * (1.0 - t) * (R_MID * 1.35) + t ** 2 * R_TOP
+    return (
+        (1.0 - t) ** 2 * R_BOT
+        + 2.0 * t * (1.0 - t) * (R_MID * 1.32)
+        + t ** 2 * R_TOP
+    )
+
+
+def pole_feet():
+    feet = []
+    for i in range(3):
+        ang = i * (2.0 * math.pi / 3.0) + POLE_OFFSET
+        feet.append(Vector((TRIPOD_R * math.cos(ang), TRIPOD_R * math.sin(ang), 0.0)))
+    return feet
 
 
-def build_cauldron_mesh(name, bevel_offset, bevel_segments):
+def build_cauldron_mesh(
+    name,
+    short_legs=False,
+    float_hook=False,
+    pipe_ferrule=False,
+):
     bm = bmesh.new()
     wood_verts = []
-    metal_faces = set()
-    pot_verts = []
     try:
-        # Shared-vertex lathe: one continuous iron shell, not overlapping
-        # stave panels (those read as a gold grid under studio lighting).
+        # Dual-wall lathe plus a rolled rim. No overlapping torus, no
+        # extra bottom cylinder — those left a hole in the floor and a
+        # faceted lip sitting on the mouth.
         zs = [POT_H * i / (N_RINGS - 1) for i in range(N_RINGS)]
-        outers = []
-        inners = []
+        rim = (
+            (POT_H + 0.004, R_TOP + 0.012),
+            (POT_H + 0.010, R_TOP + 0.018),
+            (POT_H + 0.014, R_TOP + 0.014),
+            (POT_H + 0.011, R_TOP + 0.006),
+        )
+        outers, inners = [], []
         for z_local in zs:
             z = POT_Z0 + z_local
             r = pot_radius(z_local)
-            ri = max(r - POT_THICK, 0.018)
-            oring = []
-            iring = []
+            ri = max(r - POT_THICK, 0.014)
+            oring, iring = [], []
+            for i in range(N_AROUND):
+                a = 2.0 * math.pi * i / N_AROUND
+                oring.append(bm.verts.new((r * math.cos(a), r * math.sin(a), z)))
+                iring.append(bm.verts.new((ri * math.cos(a), ri * math.sin(a), z)))
+            outers.append(oring)
+            inners.append(iring)
+        for z_off, r in rim:
+            z = POT_Z0 + z_off
+            ri = max(r - POT_THICK, 0.014)
+            oring, iring = [], []
             for i in range(N_AROUND):
                 a = 2.0 * math.pi * i / N_AROUND
-                ov = bm.verts.new((r * math.cos(a), r * math.sin(a), z))
-                iv = bm.verts.new((ri * math.cos(a), ri * math.sin(a), z))
-                oring.append(ov)
-                iring.append(iv)
-                pot_verts.extend((ov, iv))
+                oring.append(bm.verts.new((r * math.cos(a), r * math.sin(a), z)))
+                iring.append(bm.verts.new((ri * math.cos(a), ri * math.sin(a), z)))
             outers.append(oring)
             inners.append(iring)
-        for k in range(N_RINGS - 1):
+        for k in range(len(outers) - 1):
             for i in range(N_AROUND):
                 j = (i + 1) % N_AROUND
                 fo = bm.faces.new(
@@ -574,106 +741,117 @@ 
Source

                 fi.material_index = METAL_IDX
         for i in range(N_AROUND):
             j = (i + 1) % N_AROUND
-            bot = bm.faces.new(
-                (outers[0][j], outers[0][i], inners[0][i], inners[0][j])
-            )
-            bot.material_index = METAL_IDX
-            rim = bm.faces.new(
+            lip = bm.faces.new(
                 (outers[-1][i], outers[-1][j], inners[-1][j], inners[-1][i])
             )
-            rim.material_index = METAL_IDX
+            lip.material_index = METAL_IDX
+        oc = bm.verts.new((0.0, 0.0, POT_Z0))
+        ic = bm.verts.new((0.0, 0.0, POT_Z0 + POT_THICK))
+        for i in range(N_AROUND):
+            j = (i + 1) % N_AROUND
+            bot = bm.faces.new((oc, outers[0][j], outers[0][i]))
+            bot.material_index = METAL_IDX
+            ibot = bm.faces.new((ic, inners[0][i], inners[0][j]))
+            ibot.material_index = METAL_IDX
 
-        before = set(bm.faces)
-        add_cylinder(
-            bm,
-            (0.0, 0.0, POT_Z0 + POT_THICK * 0.6),
-            pot_radius(0.0) - POT_THICK * 0.2,
-            POT_THICK * 1.2,
-            16,
-            METAL_IDX,
-        )
         mouth_z = POT_Z0 + POT_H
-        add_rim(bm, (0.0, 0.0, mouth_z), R_TOP + 0.008, 0.012, METAL_IDX)
-        ear_x = R_TOP + 0.012
+        # Vertical rings (hole along Y) so the XZ bail can thread them.
+        ear_x = R_TOP + 0.008
+        ear_z = mouth_z + 0.002
         for sign in (-1.0, 1.0):
-            add_box(bm, (sign * ear_x, 0.0, mouth_z - 0.01), (0.024, 0.030, 0.040), METAL_IDX)
-            add_rim(
+            add_torus(
                 bm,
-                (sign * (ear_x + 0.004), 0.0, mouth_z + 0.008),
-                0.014,
-                0.005,
+                (sign * ear_x, 0.0, ear_z),
+                EAR_MAJOR,
+                EAR_MINOR,
+                14,
+                6,
                 METAL_IDX,
-                euler=(math.radians(90.0), 0.0, 0.0),
+                euler=(math.pi / 2.0, 0.0, 0.0),
             )
-        bail_major = ear_x + 0.004
+        # Semicircle through the ear holes, ends past the rings.
+        t0 = -0.42
+        t1 = math.pi + 0.42
         bail_pts = []
         for i in range(BAIL_SEGS + 1):
-            t = math.pi * i / BAIL_SEGS
+            t = t0 + (t1 - t0) * i / BAIL_SEGS
             bail_pts.append(
-                (
-                    bail_major * math.cos(t),
-                    0.0,
-                    mouth_z + 0.008 + bail_major * math.sin(t),
-                )
+                (ear_x * math.cos(t), 0.0, ear_z + ear_x * math.sin(t))
             )
-        for a, b in zip(bail_pts, bail_pts[1:]):
-            add_oriented_box(bm, a, b, (BAIL_R * 2.0, BAIL_R * 2.0), METAL_IDX)
-        metal_faces.update(set(bm.faces) - before)
-
-        pole_feet = []
-        for i in range(3):
-            ang = i * (2.0 * math.pi / 3.0) + math.radians(18.0)
-            foot = Vector((TRIPOD_R * math.cos(ang), TRIPOD_R * math.sin(ang), 0.016))
-            apex = Vector((0.0, 0.0, APEX_Z))
-            pole_feet.append(foot)
-            wood_verts.extend(add_cone_between(bm, foot, apex, 0.028, 0.018, 8, WOOD_IDX))
-            before = set(bm.faces)
-            add_cone_between(
-                bm,
-                foot + Vector((0.0, 0.0, 0.008)),
-                foot - Vector((0.0, 0.0, 0.014)),
-                0.032,
-                0.032,
-                8,
-                METAL_IDX,
-            )
-            metal_faces.update(set(bm.faces) - before)
-
-        wood_verts.extend(add_cylinder(bm, (0.0, 0.0, APEX_Z - 0.02), 0.042, 0.055, 10, WOOD_IDX))
-        before = set(bm.faces)
-        hook_z1 = APEX_Z - 0.055
-        bail_peak = mouth_z + 0.008 + bail_major
-        add_cone_between(
+        add_pipe_curve(bm, bail_pts, BAIL_R, BAIL_PIPE, METAL_IDX)
+        bail_peak = Vector(bail_pts[len(bail_pts) // 2])
+        hook_z = bail_peak.z + (0.08 if float_hook else 0.0)
+        add_torus(
             bm,
-            (0.0, 0.0, hook_z1),
-            (0.0, 0.0, bail_peak + 0.012),
-            0.010,
-            0.010,
-            8,
+            (0.0, 0.0, hook_z),
+            BAIL_R + HOOK_R * 0.85,
+            HOOK_R,
+            12,
+            6,
             METAL_IDX,
+            euler=(0.0, math.radians(90.0), 0.0),
         )
-        add_rim(
+        crown_z0 = APEX_Z - CROWN_H
+        lathe_axis(
             bm,
-            (0.0, 0.0, bail_peak + 0.004),
-            0.018,
-            0.006,
+            (0.0, 0.0, hook_z + HOOK_R),
+            (0.0, 0.0, crown_z0 + 0.008),
+            ((0.0, HOOK_R * 0.9), (1.0, HOOK_R * 0.9)),
+            8,
             METAL_IDX,
-            euler=(math.radians(90.0), 0.0, 0.0),
         )
-        metal_faces.update(set(bm.faces) - before)
-
-        if bevel_offset > 0.0:
-            edges = list({e for v in wood_verts for e in v.link_edges if v.is_valid})
-            if edges:
-                bmesh.ops.bevel(
-                    bm,
-                    geom=edges,
-                    offset=bevel_offset,
-                    segments=bevel_segments,
-                    profile=0.5,
-                    affect="EDGES",
-                    clamp_overlap=True,
-                )
+
+        lathe_z(
+            bm,
+            (
+                (0.000, 0.032),
+                (0.018, 0.046),
+                (0.048, 0.042),
+                (CROWN_H, 0.026),
+            ),
+            16,
+            WOOD_IDX,
+            z0=crown_z0,
+        )
+        feet = pole_feet()
+        ferrule_z0 = 0.05 if short_legs else 0.0
+        if short_legs:
+            geo = bmesh.ops.create_cube(bm, size=1.0)
+            for v in geo["verts"]:
+                v.co.x *= 0.024
+                v.co.y *= 0.024
+                v.co.z *= 0.006
+                v.co.z += 0.003
+            for f in {f for v in geo["verts"] for f in v.link_faces}:
+                f.material_index = METAL_IDX
+        for foot in feet:
+            ang = math.atan2(foot.y, foot.x)
+            top = Vector((
+                INSERT_R * math.cos(ang),
+                INSERT_R * math.sin(ang),
+                APEX_Z - 0.030,
+            ))
+            origin = Vector((foot.x, foot.y, ferrule_z0))
+            tangent = (top - origin).normalized()
+            r_in = POLE_R_FOOT + 0.002
+            r_out = r_in + FERRULE_T
+            lean = math.sqrt(max(0.0, 1.0 - tangent.z * tangent.z))
+            shifted = origin + tangent * ((r_out * lean) / max(tangent.z, 0.25))
+            add_cup_along(
+                bm, origin, tangent, r_in, r_out, FERRULE_H,
+                FERRULE_SEGS, METAL_IDX,
+            )
+            # Same shoe either way so AABB/zmin stay put. --pipe-ferrule
+            # starts the pole above the well; ferrule_bite only samples
+            # wood inside the cup's own axis span, so a hovering pole
+            # cannot fake a seat.
+            seat = FERRULE_H + 0.05 if pipe_ferrule else (FERRULE_FLOOR + 0.002)
+            bot = shifted + tangent * seat
+            lathe_axis(
+                bm, bot, top,
+                ((0.0, POLE_R_FOOT), (1.0, POLE_R_TOP)),
+                POLE_SEGS, WOOD_IDX,
+            )
 
         pack_uvs(bm)
         bmesh.ops.recalc_face_normals(bm, faces=list(bm.faces))
@@ -682,11 +860,8 @@ 
Source

         for edge in bm.edges:
             edge.smooth = True
             if edge.is_manifold and len(edge.link_faces) == 2:
-                if edge.calc_face_angle() > math.radians(70.0):
+                if edge.calc_face_angle() > math.radians(55.0):
                     edge.smooth = False
-        for f in metal_faces:
-            if f.is_valid:
-                f.material_index = METAL_IDX
         me = bpy.data.meshes.new(name)
         bm.to_mesh(me)
         me.update()
@@ -696,27 +871,45 @@ 
Source

     bpy.context.collection.objects.link(obj)
     return obj
 
-def principled(name, color, metallic, roughness):
+
+def principled(name, color, metallic, roughness, noise_scale=0.0, wear=None):
     mat = bpy.data.materials.new(name)
     mat.use_nodes = True
-    bsdf = mat.node_tree.nodes["Principled BSDF"]
+    nt = mat.node_tree
+    bsdf = nt.nodes["Principled BSDF"]
     bsdf.inputs["Base Color"].default_value = color
     bsdf.inputs["Metallic"].default_value = metallic
     bsdf.inputs["Roughness"].default_value = roughness
+    if noise_scale > 0.0 and wear is not None:
+        tex = nt.nodes.new("ShaderNodeTexNoise")
+        tex.inputs["Scale"].default_value = noise_scale
+        tex.inputs["Detail"].default_value = 8.0
+        tex.inputs["Roughness"].default_value = 0.55
+        mix = nt.nodes.new("ShaderNodeMix")
+        mix.data_type = "RGBA"
+        mix.inputs["A"].default_value = color
+        mix.inputs["B"].default_value = wear
+        fac = mix.inputs.get("Factor") or mix.inputs.get("Fac")
+        nt.links.new(tex.outputs["Fac"], fac)
+        nt.links.new(mix.outputs["Result"], bsdf.inputs["Base Color"])
+        rmix = nt.nodes.new("ShaderNodeMix")
+        rmix.data_type = "FLOAT"
+        rmix.inputs["A"].default_value = roughness
+        rmix.inputs["B"].default_value = min(1.0, roughness + 0.18)
+        rfac = rmix.inputs.get("Factor") or rmix.inputs.get("Fac")
+        nt.links.new(tex.outputs["Fac"], rfac)
+        nt.links.new(rmix.outputs["Result"], bsdf.inputs["Roughness"])
     return mat
 
 
 def assign_slots(obj, wood, metal):
     mats = obj.data.materials
-    if len(mats) == 0:
-        mats.append(wood)
-        mats.append(metal)
-        return
-    mats[0] = wood
-    if len(mats) == 1:
-        mats.append(metal)
-    else:
-        mats[1] = metal
+    wanted = (wood, metal)
+    for i, mat in enumerate(wanted):
+        if i < len(mats):
+            mats[i] = mat
+        else:
+            mats.append(mat)
 
 
 def world_bbox(obj):
@@ -728,15 +921,7 @@ 
Source

 
 
 def pot_tripod_clearance(mesh):
-    # Recomputed from verts vs the three pole axes. Leg verts sit on the
-    # axes and are skipped; remaining shell verts in the pot band must
-    # clear the pole radius.
-    feet = []
-    for i in range(3):
-        ang = i * (2.0 * math.pi / 3.0) + math.radians(18.0)
-        feet.append(
-            Vector((TRIPOD_R * math.cos(ang), TRIPOD_R * math.sin(ang), 0.016))
-        )
+    feet = pole_feet()
     apex = Vector((0.0, 0.0, APEX_Z))
     z0 = POT_Z0 - 0.02
     z1 = POT_Z0 + POT_H + 0.03
@@ -756,7 +941,7 @@ 
Source

                 continue
             t = max(0.0, min(1.0, (p - foot).dot(ab) / denom))
             axis = (p - (foot + t * ab)).length
-            rad = 0.028 * (1.0 - t) + 0.018 * t
+            rad = POLE_R_FOOT * (1.0 - t) + POLE_R_TOP * t
             gap = axis - rad
             if axis < rad + 0.006:
                 on_pole = True
@@ -795,6 +980,268 @@ 
Source

     return min(us), min(vs), max(us), max(vs), overlap, len(aabbs)
 
 
+def face_area(me, poly):
+    idxs = poly.vertices
+    if len(idxs) < 3:
+        return 0.0
+    v0 = me.vertices[idxs[0]].co
+    area = 0.0
+    for i in range(1, len(idxs) - 1):
+        vs = (me.vertices[idxs[i]].co, me.vertices[idxs[i + 1]].co)
+        area += (vs[0] - v0).cross(vs[1] - v0).length * 0.5
+    return area
+
+
+def hygiene_audit(me):
+    nv, ne, nf = len(me.vertices), len(me.edges), len(me.polygons)
+    ngons = sum(1 for p in me.polygons if len(p.vertices) > 4)
+    zero_area = sum(1 for p in me.polygons if face_area(me, p) <= AREA_EPS)
+    bm = bmesh.new()
+    try:
+        bm.from_mesh(me)
+        bm.verts.ensure_lookup_table()
+        bm.edges.ensure_lookup_table()
+        loose_v = sum(1 for v in bm.verts if len(v.link_edges) == 0)
+        loose_e = sum(1 for e in bm.edges if len(e.link_faces) == 0)
+        nonman = sum(1 for e in bm.edges if not e.is_manifold)
+        ret = bmesh.ops.find_doubles(bm, verts=list(bm.verts), dist=DOUBLES_EPS)
+        doubles = len(ret.get("targetmap") or {})
+    finally:
+        bm.free()
+    return {
+        "nv": nv, "ne": ne, "nf": nf, "ngons": ngons,
+        "loose_v": loose_v, "loose_e": loose_e, "nonman": nonman,
+        "zero_area": zero_area, "doubles": doubles, "euler": nv - ne + nf,
+    }
+
+
+def zfight_pairs(me):
+    data = [
+        (p.center.copy(), p.normal.copy(), frozenset(p.vertices))
+        for p in me.polygons
+    ]
+    eps2 = ZFIGHT_EPS * ZFIGHT_EPS
+    count = 0
+    for i in range(len(data)):
+        ci, ni, vi = data[i]
+        for j in range(i + 1, len(data)):
+            cj, nj, vj = data[j]
+            if (cj - ci).length_squared > eps2:
+                continue
+            if abs(ni.dot(nj)) <= ZFIGHT_COS:
+                continue
+            if vi & vj:
+                continue
+            count += 1
+    return count
+
+
+def shells(me):
+    neighbors = [[] for _ in range(len(me.vertices))]
+    for edge in me.edges:
+        a, b = edge.vertices
+        neighbors[a].append(b)
+        neighbors[b].append(a)
+    seen = [False] * len(me.vertices)
+    groups = []
+    for start in range(len(me.vertices)):
+        if seen[start]:
+            continue
+        seen[start] = True
+        stack = [start]
+        group = []
+        while stack:
+            current = stack.pop()
+            group.append(current)
+            for nxt in neighbors[current]:
+                if not seen[nxt]:
+                    seen[nxt] = True
+                    stack.append(nxt)
+        groups.append(group)
+    return groups
+
+
+def shell_aabb(me, group):
+    pts = [me.vertices[i].co for i in group]
+    return (
+        min(p.x for p in pts), min(p.y for p in pts), min(p.z for p in pts),
+        max(p.x for p in pts), max(p.y for p in pts), max(p.z for p in pts),
+    )
+
+
+def mat_of(me, group):
+    member = set(group)
+    for p in me.polygons:
+        if all(i in member for i in p.vertices):
+            return p.material_index
+    return None
+
+
+def support_audit(me):
+    groups = shells(me)
+    cups = []
+    for g in groups:
+        if mat_of(me, g) != METAL_IDX:
+            continue
+        a = shell_aabb(me, g)
+        dx, dy, dz = a[3] - a[0], a[4] - a[1], a[5] - a[2]
+        if a[5] < 0.14 and dx > 0.03 and dy > 0.03 and dz < 0.12:
+            cups.append(a)
+    cup_z = min((a[2] for a in cups), default=99.0)
+    return {"cups": len(cups), "cup_z": cup_z}
+
+
+def pot_audit(me):
+    groups = shells(me)
+    best = None
+    best_r = -1.0
+    for g in groups:
+        if mat_of(me, g) != METAL_IDX:
+            continue
+        a = shell_aabb(me, g)
+        dx, dy, dz = a[3] - a[0], a[4] - a[1], a[5] - a[2]
+        r = 0.5 * 0.5 * (dx + dy)
+        if dz > 0.20 and r > best_r:
+            best_r = r
+            best = a
+    if best is None:
+        return {"dia": 0.0, "height": 0.0}
+    return {
+        "dia": 0.5 * ((best[3] - best[0]) + (best[4] - best[1])),
+        "height": best[5] - best[2],
+    }
+
+
+def hook_bail_join(me):
+    """Worst gap from the compact hook ring to the bail pipe."""
+    groups = shells(me)
+    hooks, bails = [], []
+    for g in groups:
+        if mat_of(me, g) != METAL_IDX:
+            continue
+        a = shell_aabb(me, g)
+        dx, dy, dz = a[3] - a[0], a[4] - a[1], a[5] - a[2]
+        cz = 0.5 * (a[2] + a[5])
+        if cz > 0.55 and max(dx, dy, dz) < 0.08:
+            hooks.append(g)
+        elif dz > 0.12 and a[2] > 0.35 and max(dx, dy) > 0.20:
+            bails.append(g)
+    if not hooks or not bails:
+        return 99.0
+    bm_b = bmesh.new()
+    try:
+        bm_b.from_mesh(me)
+        keep = set()
+        for g in bails:
+            keep.update(g)
+        drop = [
+            f for f in bm_b.faces
+            if not all(v.index in keep for v in f.verts)
+        ]
+        if drop:
+            bmesh.ops.delete(bm_b, geom=drop, context="FACES")
+        if not bm_b.faces:
+            return 99.0
+        tree = BVHTree.FromBMesh(bm_b)
+        worst = 0.0
+        for g in hooks:
+            bm_h = bmesh.new()
+            try:
+                bm_h.from_mesh(me)
+                member = set(g)
+                drop_h = [
+                    f for f in bm_h.faces
+                    if not all(v.index in member for v in f.verts)
+                ]
+                if drop_h:
+                    bmesh.ops.delete(bm_h, geom=drop_h, context="FACES")
+                if not bm_h.faces:
+                    worst = max(worst, 99.0)
+                    continue
+                tree_h = BVHTree.FromBMesh(bm_h)
+                if tree.overlap(tree_h):
+                    continue
+                best = 99.0
+                for i in g:
+                    hit = tree.find_nearest(me.vertices[i].co)
+                    if hit[0] is None:
+                        continue
+                    best = min(best, hit[3])
+                if best > worst:
+                    worst = best
+            finally:
+                bm_h.free()
+        return worst
+    finally:
+        bm_b.free()
+
+
+def ferrule_bite(me):
+    """Pole radius minus cup inner wall, in the pole's own frame.
+
+    World-XY distance lies about a leaning pole that is coaxial with its
+    shoe: the foot sits on the axis while the rim is offset in XY, so a
+    vertical-bucket metric reports a false gap. Measure radial distance
+    from the pole axis instead.
+    """
+    groups = shells(me)
+    cups, woods = [], []
+    for g in groups:
+        a = shell_aabb(me, g)
+        if mat_of(me, g) == METAL_IDX and a[5] < 0.12 and (a[5] - a[2]) < 0.10:
+            cups.append(g)
+        elif mat_of(me, g) == WOOD_IDX and a[2] < 0.12 and (a[5] - a[2]) > 0.15:
+            woods.append(g)
+    if not cups or not woods:
+        return 0.0
+    feet = pole_feet()
+    apex = Vector((0.0, 0.0, APEX_Z))
+    wood_pts = [me.vertices[i].co.copy() for g in woods for i in g]
+    bites = []
+    for g in cups:
+        pts = [me.vertices[i].co.copy() for i in g]
+        centroid = sum(pts, Vector((0.0, 0.0, 0.0))) / len(pts)
+        foot = min(feet, key=lambda f: (f - centroid).length)
+        axis = apex - foot
+        if axis.length < 1e-8:
+            continue
+        axis.normalize()
+
+        def rad(p):
+            return (p - foot).cross(axis).length
+
+        wall = [rad(p) for p in pts if rad(p) > 0.010]
+        if not wall:
+            continue
+        r_in = min(wall)
+        span = [(p - foot).dot(axis) for p in pts]
+        t0, t1 = min(span), max(span)
+        near = [
+            p for p in wood_pts
+            if rad(p) > 0.010
+            and (p - centroid).length < 0.10
+            and (t0 - 0.002) <= (p - foot).dot(axis) <= (t1 + 0.002)
+        ]
+        if not near:
+            continue
+        r_wood = min(rad(p) for p in near)
+        bites.append(r_wood - r_in)
+    if not bites:
+        return 0.05
+    return min(bites)
+
+
+def add_stray_vert(me):
+    bm = bmesh.new()
+    try:
+        bm.from_mesh(me)
+        bm.verts.new((0.0, 0.0, APEX_Z))
+        bm.to_mesh(me)
+        me.update()
+    finally:
+        bm.free()
+
+
 def make_lod(obj, name, ratio, skip_decimate):
     mesh = obj.data.copy()
     lod = bpy.data.objects.new(name, mesh)
@@ -808,7 +1255,6 @@ 
Source

 
 
 def convex_hull_collider(obj, name):
-    # Duplicated from snippets/convex_hull_collider.py (not a package).
     mesh = bpy.data.meshes.new(name)
     bm = bmesh.new()
     try:
@@ -831,7 +1277,6 @@ 
Source

 
 
 def setup_bake_image(obj, target_mat, size=BAKE_RES):
-    # Adapted from snippets/setup_bake_target_image.py — do not replace slots.
     if not obj.data.uv_layers:
         return None, None
     img = bpy.data.images.new("CauldronNrm", size, size, alpha=True, float_buffer=False)
@@ -846,7 +1291,6 @@ 
Source

 
 
 def bake_normal(high, low):
-    # Duplicated from snippets/bake_normal_high_to_low.py (not a package).
     scene = bpy.context.scene
     scene.render.engine = "CYCLES"
     scene.cycles.device = "CPU"
@@ -871,7 +1315,6 @@ 
Source

 
 
 def export_unity(path, objects):
-    # Duplicated from snippets/export_preset_unity.py (not a package).
     for ob in bpy.context.view_layer.objects:
         ob.select_set(False)
     for ob in objects:
@@ -887,14 +1330,39 @@ 
Source

     )
 
 
-def check(skip_decimate):
+def check(
+    skip_decimate,
+    lift_z=False,
+    stray_vert=False,
+    short_legs=False,
+    float_hook=False,
+    pipe_ferrule=False,
+):
     bpy.ops.wm.read_factory_settings(use_empty=True)
-    low = build_cauldron_mesh("CauldronLow", bevel_offset=0.003, bevel_segments=2)
-    high = build_cauldron_mesh("CauldronHigh", bevel_offset=0.003, bevel_segments=4)
-    wood = principled("TripodWood", (0.38, 0.22, 0.09, 1.0), 0.0, 0.58)
-    metal = principled("CauldronIron", (0.10, 0.095, 0.09, 1.0), 0.92, 0.40)
+    flags = dict(
+        short_legs=short_legs,
+        float_hook=float_hook,
+        pipe_ferrule=pipe_ferrule,
+    )
+    low = build_cauldron_mesh("CauldronLow", **flags)
+    high = build_cauldron_mesh("CauldronHigh", **flags)
+    wood = principled(
+        "TripodWood", (0.38, 0.22, 0.09, 1.0), 0.0, 0.58,
+        noise_scale=6.0, wear=(0.22, 0.12, 0.05, 1.0),
+    )
+    metal = principled(
+        "CauldronIron", (0.10, 0.095, 0.09, 1.0), 0.92, 0.40,
+        noise_scale=5.0, wear=(0.18, 0.16, 0.14, 1.0),
+    )
     assign_slots(low, wood, metal)
     assign_slots(high, wood, metal)
+    if stray_vert:
+        add_stray_vert(low.data)
+    if lift_z:
+        for v in low.data.vertices:
+            v.co.z += LIFT_Z
+        low.data.update()
+        bpy.context.view_layer.update()
 
     if low.data is None or len(low.data.polygons) < 6:
         return fail("cauldron mesh did not build", 3), None, None, None, None, None
@@ -934,7 +1402,7 @@ 
Source

     r1 = lod1_tris / base_tris if base_tris else 0.0
     r2 = lod2_tris / base_tris if base_tris else 0.0
 
-    collider_src = build_cauldron_mesh("CauldronColSrc", bevel_offset=0.0, bevel_segments=1)
+    collider_src = build_cauldron_mesh("CauldronColSrc", **flags)
     collider = convex_hull_collider(collider_src, "CauldronCollider")
     bpy.data.objects.remove(collider_src, do_unlink=True)
     col_tris = triangle_count(collider.data)
@@ -948,9 +1416,14 @@ 
Source

     export_unity(export_path, [low, collider])
     export_size = os.path.getsize(export_path) if os.path.isfile(export_path) else 0
 
-    print(
-        f"blender={tuple(bpy.app.version)} skip_decimate={skip_decimate}"
-    )
+    hyg = hygiene_audit(low.data)
+    zf = zfight_pairs(low.data)
+    sup = support_audit(low.data)
+    pot = pot_audit(low.data)
+    hj = hook_bail_join(low.data)
+    bite = ferrule_bite(low.data)
+
+    print(f"blender={tuple(bpy.app.version)} skip_decimate={skip_decimate}")
     print(
         f"measured base_tris={base_tris} lod1_tris={lod1_tris} "
         f"lod2_tris={lod2_tris} r1={r1:.4f} r2={r2:.4f}"
@@ -967,6 +1440,16 @@ 
Source

         f"measured collider_tris={col_tris} bake={bake_result} "
         f"bake_has_data={img.has_data} export_bytes={export_size}"
     )
+    print(
+        f"measured hygiene loose_v={hyg['loose_v']} loose_e={hyg['loose_e']} "
+        f"nonman={hyg['nonman']} zero_area={hyg['zero_area']} "
+        f"doubles={hyg['doubles']} ngons={hyg['ngons']} zfight={zf}"
+    )
+    print(
+        f"measured supports cups={sup['cups']} cup_z={sup['cup_z']:.5f} "
+        f"pot_dia={pot['dia']:.4f} pot_h={pot['height']:.4f} "
+        f"hook_join={hj:.5f} ferrule_bite={bite:.5f}"
+    )
 
     if not (BASE_TRIS_MIN <= base_tris <= BASE_TRIS_MAX):
         return fail(
@@ -1031,6 +1514,51 @@ 
Source

         ), None, None, None, None, None
     if export_size <= 0:
         return fail("export file missing or empty", 13), None, None, None, None, None
+    if (
+        hyg["loose_v"] or hyg["loose_e"] or hyg["nonman"]
+        or hyg["zero_area"] or hyg["doubles"] or hyg["ngons"] or zf
+    ):
+        return fail(
+            f"hygiene loose_v={hyg['loose_v']} loose_e={hyg['loose_e']} "
+            f"nonman={hyg['nonman']} zero_area={hyg['zero_area']} "
+            f"doubles={hyg['doubles']} ngons={hyg['ngons']} zfight={zf}",
+            15,
+        ), None, None, None, None, None
+    if abs(bb[2]) > ZMIN_EPS:
+        return fail(
+            f"zmin {bb[2]:.6f} not within {ZMIN_EPS} of 0 "
+            "(--lift-z is the designed fail)",
+            16,
+        ), None, None, None, None, None
+    if sup["cups"] < 3 or sup["cup_z"] > FERRULE_Z_MAX:
+        return fail(
+            f"ferrule supports {sup['cups']} cup_z={sup['cup_z']:.5f} "
+            "(--short-legs is the designed fail)",
+            16,
+        ), None, None, None, None, None
+    if hj > HOOK_JOIN:
+        return fail(
+            f"hook-bail gap {hj:.5f} > {HOOK_JOIN} "
+            "(--float-hook is the designed fail)",
+            17,
+        ), None, None, None, None, None
+    if not (FERRULE_BITE_MIN <= bite <= FERRULE_BITE_MAX):
+        return fail(
+            f"ferrule bite {bite:.5f} not in "
+            f"[{FERRULE_BITE_MIN}, {FERRULE_BITE_MAX}] "
+            "(--pipe-ferrule is the designed fail)",
+            18,
+        ), None, None, None, None, None
+    if abs(pot["dia"] - BODY_DIA) > BODY_DIA_TOL:
+        return fail(
+            f"pot diameter {pot['dia']:.4f} off {BODY_DIA}",
+            19,
+        ), None, None, None, None, None
+    if abs(pot["height"] - BODY_H) > BODY_H_TOL:
+        return fail(
+            f"pot height {pot['height']:.4f} off {BODY_H}",
+            19,
+        ), None, None, None, None, None
     return 0, low, high, wood, tex, collider
 
 
@@ -1144,14 +1672,22 @@ 
Source

     p = argparse.ArgumentParser()
     p.add_argument("--output", default=None)
     p.add_argument("--engine", default="eevee", choices=("eevee", "cycles"))
-    p.add_argument(
-        "--skip-decimate",
-        action="store_true",
-        help="falsification: skip the LOD DECIMATE stage",
-    )
+    p.add_argument("--skip-decimate", action="store_true")
+    p.add_argument("--lift-z", action="store_true")
+    p.add_argument("--stray-vert", action="store_true")
+    p.add_argument("--short-legs", action="store_true")
+    p.add_argument("--float-hook", action="store_true")
+    p.add_argument("--pipe-ferrule", action="store_true")
     args = p.parse_args(argv)
 
-    code, low, _high, wood, tex, _col = check(args.skip_decimate)
+    code, low, _high, wood, tex, _col = check(
+        args.skip_decimate,
+        lift_z=args.lift_z,
+        stray_vert=args.stray_vert,
+        short_legs=args.short_legs,
+        float_hook=args.float_hook,
+        pipe_ferrule=args.pipe_ferrule,
+    )
     if code:
         return code
     if args.output:
diff --git a/showcase/iron-cauldron/README.md b/showcase/iron-cauldron/README.md
index 34857e2..9a77d25 100644
--- a/showcase/iron-cauldron/README.md
+++ b/showcase/iron-cauldron/README.md
@@ -1,9 +1,16 @@
 # Iron cauldron
 
-A showcase piece, not an example. Procedural hanging cauldron (bulged
-iron pot with an open mouth, bail, timber tripod) then the shipped
-pipeline: unique-cell UVs, Cycles high-to-low normal bake, LOD chain,
-convex collider, Unity glTF export.
+A showcase piece, not an example. Procedural hanging cauldron (lathed
+iron pot with a rolled rim, pipe bail through vertical ear rings, timber
+tripod tenoned into a turned crown, iron ferrule cups coaxial with the
+poles) then the shipped pipeline: unique-cell UVs, Cycles high-to-low
+normal bake, LOD chain, convex collider, Unity glTF export.
+
+Ferrules are lofted along the pole axis and shifted so the downhill rim
+sits at Z=0. A world-Z bucket lets a leaning pole slice the lip.
+`ferrule_bite` is measured in that same frame, and only samples wood
+inside the cup's own axis span — a pole hovering above the well cannot
+fake a seat.
 
 It asserts **budget conformance** of the generated result. It does not
 witness an API contract. "It rendered without error" is not a check.
@@ -21,41 +28,83 @@ materials, UVs, evaluated LOD, collider, or export file.
 
 | Axis | Declared | Measured (4.5.11 / 5.1.2 / 5.2.1) |
 | --- | --- | --- |
-| Base triangles | 3280–3520 | 3388 / 3388 / 3388 |
+| Base triangles | 2800–4200 | 3664 / 3664 / 3664 |
 | LOD1 ratio | 0.32–0.62 of base | 0.5000 / 0.5000 / 0.5000 |
-| LOD2 ratio | 0.10–0.35 of base | 0.2196 / 0.2196 / 0.2172 |
-| Materials | exactly 2 distinct, ≥12 wood, ≥24 metal | 2 slots, 450 wood, 1198 metal |
+| LOD2 ratio | 0.10–0.35 of base | 0.2200 / 0.2200 / 0.2200 |
+| Materials | exactly 2 distinct; ≥80 wood, ≥200 metal faces | 2 slots; 224 / 1768 |
 | UVs | in `0..1`, AABB overlap ≤ 1e-5 | in range, overlap 0 |
-| Outer AABB | (1.013, 0.986, 0.827) m ± 0.01 | (1.0128, 0.9865, 0.8271), zmin 0.002 |
-| Pot–leg clearance | ≥ 0.04 m (recomputed vs pole axes) | 0.0513 / 0.0513 / 0.0513 |
-| Collider tris | ≤ 200 | 98 |
-| Export | written, size > 0 | 245060 / 245060 / 245044 bytes |
+| Outer AABB | (0.987, 0.961, 0.860) m ± 0.015 | (0.9866, 0.9605, 0.8600), zmin 0 |
+| Collider tris | ≤ 280 | 250 |
+| Export | written, size > 0 | 287916 / 287916 / 287904 bytes |
+
+Base triangles rose from **3388 to 3664** in the quality pass: coaxial
+ferrule cups and a dual-wall lathe with a rolled rim replaced the old
+cone-tripod / overlapping-torus construction.
+
+### Hygiene
+
+Recomputed from the generated mesh, not asserted about the script.
+
+| Axis | Declared | Measured (all three) |
+| --- | --- | --- |
+| Non-manifold edges | 0 | 0 |
+| Loose verts / edges | 0 / 0 | 0 / 0 |
+| Doubles merged at 1e-5 | 0 | 0 |
+| Zero-area faces | 0 | 0 |
+| N-gons | 0 | 0 |
+| Coplanar disjoint face pairs | 0 | 0 |
+| Grounded: `zmin` | within 1e-4 of 0 | 0.0000 |
+| Named supports: 3 ferrules | each `zmin` ≤ 1e-3 | 3, cup_z 0.00000 |
+| Pot size | 0.355 m dia × 0.334 m high ± 0.04 | 0.3545 × 0.3340 |
+| Pot–leg clearance | ≥ 0.04 m | 0.0464 |
+
+### Joint fit and seat
+
+| Axis | Declared | Measured (all three) |
+| --- | --- | --- |
+| Hook-bail BVH gap | ≤ 0.010 m | 0.00000 |
+| Ferrule bite (pole r − inner wall, pole frame) | −0.006–0.000 m | −0.00185 |
 
 DECIMATE COLLAPSE triangle counts are **not** identical across series —
-5.2.1 is 8 tris leaner on LOD2. The gate is a ratio band, not an exact
-count. Bake pixels are stochastic; the gate is `has_data` plus operator
-`FINISHED`, not byte-identity. Construction uses no RNG. Export byte
-counts differ by 16 B on 5.2.1 (glTF serializer), not a gated axis.
-The pot–leg clearance is recomputed from shell verts vs the three pole
-axes; clipping exits 3.
+the gate is a ratio band, not an exact count. Bake pixels are
+stochastic; the gate is `has_data` plus operator `FINISHED`, not
+byte-identity. Construction uses no RNG. Export byte counts differ by
+12 B on 5.2.1 (glTF serializer), not a gated axis.
 
-`--skip-decimate` skips the LOD DECIMATE stage so LOD1 ratio is 1.0 and
-exit 9 fires. That is the named budget the falsifier violates.
+### Falsifiers
+
+Each violates one named budget. All seven were run on 4.5.11, 5.1.2 and
+5.2.1 and returned the same code on each.
+
+| Flag | Budget violated | Exit |
+| --- | --- | --- |
+| `--skip-decimate` | LOD1 ratio band | 9 |
+| `--stray-vert` | loose vertex count is 0 | 15 |
+| `--lift-z` | bounding box `zmin` is 0 | 16 |
+| `--short-legs` | named ferrule supports at Z=0 | 16 |
+| `--float-hook` | hook-bail gap | 17 |
+| `--pipe-ferrule` | ferrule bite (pole starts above the well) | 18 |
 
 ## Run
 
 ```bash
 blender --background --python iron_cauldron.py --
 blender --background --python iron_cauldron.py -- --skip-decimate
+blender --background --python iron_cauldron.py -- --stray-vert
+blender --background --python iron_cauldron.py -- --lift-z
+blender --background --python iron_cauldron.py -- --short-legs
+blender --background --python iron_cauldron.py -- --float-hook
+blender --background --python iron_cauldron.py -- --pipe-ferrule
 blender --background --python iron_cauldron.py -- --output cauldron.png
 ```
 
-Smoke does not pass `--output` or `--skip-decimate`.
+Smoke passes no flags.
 
 ## Exit codes
 
 File-local. `9` is a valid check code. `10` is reserved for
-`gallery_framing.check_framing` on the `--output` path.
+`gallery_framing.check_framing` on the `--output` path. `15`–`19` are the
+hygiene and joint-fit family.
 
 | Code | Meaning |
 | --- | --- |
@@ -64,7 +113,7 @@ File-local. `9` is a valid check code. `10` is reserved for
 | 2 | argparse / usage |
 | 3 | Mesh did not build / no UV layer / pot clips tripod |
 | 4 | Base triangle count outside range |
-| 5 | Material count ≠ 2 distinct slots, or wood/metal faces missing |
+| 5 | Material count ≠ 2 distinct slots, or a face-count floor missed |
 | 6 | UVs outside 0..1 |
 | 7 | UV AABB overlap above tolerance |
 | 8 | World AABB off declared outer size |
@@ -74,3 +123,8 @@ File-local. `9` is a valid check code. `10` is reserved for
 | 12 | Bake did not finish or image has no data |
 | 13 | Export file missing or empty |
 | 14 | `--output` produced no file |
+| 15 | Mesh hygiene: loose, non-manifold, zero-area, doubles, n-gons, z-fight |
+| 16 | Not grounded: bounding box `zmin` off 0, or a named ferrule floats |
+| 17 | Joint fit: hook-bail gap |
+| 18 | Seat: ferrule bite band |
+| 19 | Pot diameter or height off the stated real-world size |
diff --git a/showcase/iron-cauldron/iron_cauldron.py b/showcase/iron-cauldron/iron_cauldron.py
index 5f7cf5c..a8e28fc 100644
--- a/showcase/iron-cauldron/iron_cauldron.py
+++ b/showcase/iron-cauldron/iron_cauldron.py
@@ -1,12 +1,21 @@
-"""Game-ready iron cauldron — a showcase piece, not an example.
+"""Game-ready hanging iron cauldron — a showcase piece, not an example.
 
-Asserts budget conformance of a procedural hanging cauldron after composing
-shipped pipeline pieces: bmesh construction, UVs, two materials, high-to-low
-normal bake, LOD chain, convex collider, Unity glTF export.
+Asserts budget conformance of a procedural cauldron (lathed pot with a
+rolled rim, pipe bail through ear rings, timber tripod tenoned into a
+turned crown, iron ferrule cups) after composing shipped pipeline pieces:
+bmesh construction, UVs, two materials, high-to-low normal bake, LOD
+chain, convex collider, Unity glTF export.
+
+The old piece was an 8-sided cone tripod piercing a 10-gon cap, a bail
+of 12 boxes, a torus rim overlapping the lathe, and ferrules floating
+2 mm off the ground.
 
 Budgets are declared below and recomputed from the generated result.
-They are not API-contract witnesses. ``--skip-decimate`` skips the LOD
-DECIMATE stage so the LOD-ratio budget fails.
+They are not API-contract witnesses. Each falsifier violates one named
+budget: ``--skip-decimate`` the LOD-ratio band, ``--stray-vert`` mesh
+hygiene, ``--lift-z`` grounded zmin, ``--short-legs`` named ferrule
+supports, ``--float-hook`` hook-bail joint-fit, ``--pipe-ferrule``
+ferrule-cup seat (pole starts above the well).
 
 No RNG. Construction is closed-form. DECIMATE COLLAPSE triangle counts
 are not byte-identical across Blender versions — the LOD gate is a
@@ -26,10 +35,8 @@
 import bmesh
 import bpy
 from mathutils import Euler, Vector
+from mathutils.bvhtree import BVHTree
 
-# Showcase lives at repo-root/showcase/, not under examples/. The framing
-# helper is the repo's only shared import and lives next to the examples;
-# resolve the repo root so we do not move gallery_framing.py.
 _REPO = os.path.abspath(
     os.path.join(os.path.dirname(os.path.abspath(__file__)), os.pardir, os.pardir)
 )
@@ -37,25 +44,48 @@
 sys.dont_write_bytecode = True
 import gallery_framing  # noqa: E402
 
-POT_H = 0.32
-POT_Z0 = 0.14
-POT_THICK = 0.014
+# Camp cauldron ~40 cm across, hanging from an ~85 cm timber tripod
+# whose feet land on a ~1.0 m circle. The pot's own size is gated
+# separately from the outer AABB (the AABB is the tripod).
+POT_H = 0.320
+POT_THICK = 0.012
 N_AROUND = 32
 N_RINGS = 12
-R_BOT = 0.050
-R_MID = 0.205
+R_BOT = 0.028
+R_MID = 0.185
 R_TOP = 0.148
-APEX_Z = 0.82
-TRIPOD_R = 0.56
-BAIL_SEGS = 12
-BAIL_R = 0.009
-BBOX_TOL = 0.01
+POT_Z0 = 0.155
+APEX_Z = 0.860
+TRIPOD_R = 0.560
+POLE_SEGS = 16
+POLE_R_FOOT = 0.024
+POLE_R_TOP = 0.016
+FERRULE_H = 0.034
+FERRULE_T = 0.006
+FERRULE_SEGS = 16
+FERRULE_FLOOR = 0.004
+CROWN_H = 0.072
+CROWN_R = 0.046
+INSERT_R = 0.026
+BAIL_SEGS = 24
+BAIL_PIPE = 8
+BAIL_R = 0.007
+HOOK_R = 0.006
+EAR_MAJOR = 0.018
+EAR_MINOR = 0.0045
+POLE_OFFSET = math.radians(18.0)
+
+BBOX_TOL = 0.015
+OUTER_SIZE = (0.987, 0.961, 0.860)
+BODY_DIA = 0.355
+BODY_DIA_TOL = 0.04
+BODY_H = 0.334
+BODY_H_TOL = 0.04
 POT_LEG_CLEARANCE_MIN = 0.04
-# Fitted after locking geometry. Recomputed from bound_box.
-OUTER_SIZE = (1.013, 0.986, 0.827)
 
-BASE_TRIS_MIN = 3280
-BASE_TRIS_MAX = 3520
+BASE_TRIS_MIN = 2800
+BASE_TRIS_MAX = 4200
+COLLIDER_TRIS_MAX = 280
 LOD1_RATIO_MIN = 0.32
 LOD1_RATIO_MAX = 0.62
 LOD2_RATIO_MIN = 0.10
@@ -65,22 +95,31 @@
 MATERIAL_COUNT = 2
 UV_EPS = 1e-4
 UV_OVERLAP_MAX = 1e-5
-COLLIDER_TRIS_MAX = 200
 BAKE_RES = 256
 CAGE_EXTRUSION = 0.08
-METAL_FACES_MIN = 24
-WOOD_FACES_MIN = 12
+METAL_FACES_MIN = 200
+WOOD_FACES_MIN = 80
+ZMIN_EPS = 1e-4
+DOUBLES_EPS = 1e-5
+AREA_EPS = 1e-10
+ZFIGHT_EPS = 1e-4
+ZFIGHT_COS = 0.999
+LIFT_Z = 0.05
+FERRULE_Z_MAX = 1e-3
+HOOK_JOIN = 0.010
+FERRULE_BITE_MIN = -0.006
+FERRULE_BITE_MAX = 0.000
 
 WOOD_IDX = 0
 METAL_IDX = 1
 
 
 def eevee_engine_id():
-    return "BLENDER_EEVEE" if bpy.app.version >= (5, 0, 0) else "BLENDER_EEVEE_NEXT"
+    return "BLENDER_EEVEE_NEXT" if bpy.app.version >= (4, 2, 0) else "BLENDER_EEVEE"
 
 
 def fail(msg, code):
-    print(f"ERROR: {msg}", file=sys.stderr)
+    print(f"FAIL[{code}]: {msg}", file=sys.stderr)
     return code
 
 
@@ -90,92 +129,154 @@ def triangle_count(mesh):
 
 
 def evaluated_triangle_count(obj):
-    # Duplicated from snippets/lod_chain.py / decimate_to_budget.py (not a package).
-    depsgraph = bpy.context.evaluated_depsgraph_get()
-    eval_obj = obj.evaluated_get(depsgraph)
-    eval_mesh = eval_obj.to_mesh()
+    deps = bpy.context.evaluated_depsgraph_get()
+    ev = obj.evaluated_get(deps)
+    mesh = ev.to_mesh()
     try:
-        eval_mesh.calc_loop_triangles()
-        return len(eval_mesh.loop_triangles)
+        mesh.calc_loop_triangles()
+        return len(mesh.loop_triangles)
     finally:
-        eval_obj.to_mesh_clear()
+        ev.to_mesh_clear()
 
 
-def add_box(bm, loc, scale, mat_idx, euler=(0.0, 0.0, 0.0)):
-    geo = bmesh.ops.create_cube(bm, size=1.0)
-    verts = geo["verts"]
-    rot = Euler(euler).to_matrix()
-    origin = Vector(loc)
-    for v in verts:
-        p = Vector((v.co.x * scale[0], v.co.y * scale[1], v.co.z * scale[2]))
-        v.co = rot @ p + origin
-    faces = {f for v in verts for f in v.link_faces}
-    for f in faces:
-        f.material_index = mat_idx
+def _bridge_rings(bm, a, b, mat_idx):
+    if len(a) == 1 and len(b) > 1:
+        c = a[0]
+        for k in range(len(b)):
+            kn = (k + 1) % len(b)
+            face = bm.faces.new((c, b[k], b[kn]))
+            face.material_index = mat_idx
+    elif len(b) == 1 and len(a) > 1:
+        c = b[0]
+        for k in range(len(a)):
+            kn = (k + 1) % len(a)
+            face = bm.faces.new((c, a[kn], a[k]))
+            face.material_index = mat_idx
+    else:
+        segs = len(a)
+        for k in range(segs):
+            kn = (k + 1) % segs
+            face = bm.faces.new((a[k], a[kn], b[kn], b[k]))
+            face.material_index = mat_idx
+
+
+def loft_rings(bm, rings, mat_idx, cap_start=True, cap_end=True, cyclic=False):
+    verts = [v for ring in rings for v in ring]
+    n = len(rings)
+    for i in range(n - 1):
+        _bridge_rings(bm, rings[i], rings[i + 1], mat_idx)
+    if cyclic and n > 2:
+        _bridge_rings(bm, rings[-1], rings[0], mat_idx)
+    if cap_start and len(rings[0]) > 1:
+        ring = rings[0]
+        c = bm.verts.new(sum((v.co for v in ring), Vector((0, 0, 0))) / len(ring))
+        verts.append(c)
+        for k in range(len(ring)):
+            kn = (k + 1) % len(ring)
+            face = bm.faces.new((c, ring[kn], ring[k]))
+            face.material_index = mat_idx
+    if cap_end and len(rings[-1]) > 1:
+        ring = rings[-1]
+        c = bm.verts.new(sum((v.co for v in ring), Vector((0, 0, 0))) / len(ring))
+        verts.append(c)
+        for k in range(len(ring)):
+            kn = (k + 1) % len(ring)
+            face = bm.faces.new((c, ring[k], ring[kn]))
+            face.material_index = mat_idx
     return verts
 
 
-def add_oriented_box(bm, a, b, scale_xy, mat_idx):
-    a = Vector(a)
-    b = Vector(b)
-    delta = b - a
-    length = delta.length
-    if length < 1e-8:
-        return []
-    quat = Vector((0.0, 0.0, 1.0)).rotation_difference(delta.normalized())
-    eul = quat.to_euler("XYZ")
-    return add_box(
-        bm,
-        ((a + b) * 0.5),
-        (scale_xy[0], scale_xy[1], length),
-        mat_idx,
-        euler=(eul.x, eul.y, eul.z),
-    )
+def lathe_z(bm, profile, segs, mat_idx, z0=0.0):
+    rings = []
+    for z, r in profile:
+        if r <= 1e-8:
+            rings.append([bm.verts.new((0.0, 0.0, z0 + z))])
+            continue
+        ring = []
+        for i in range(segs):
+            a = 2.0 * math.pi * i / segs
+            ring.append(bm.verts.new((r * math.cos(a), r * math.sin(a), z0 + z)))
+        rings.append(ring)
+    cap_start = len(rings[0]) > 1
+    cap_end = len(rings[-1]) > 1
+    return loft_rings(bm, rings, mat_idx, cap_start=cap_start, cap_end=cap_end)
 
 
-def add_cone_between(bm, a, b, r1, r2, segments, mat_idx):
+def lathe_axis(bm, a, b, profile, segs, mat_idx, cap_start=True, cap_end=True):
     a = Vector(a)
     b = Vector(b)
     delta = b - a
     length = delta.length
     if length < 1e-8:
         return []
-    quat = Vector((0.0, 0.0, 1.0)).rotation_difference(delta.normalized())
-    eul = quat.to_euler("XYZ")
-    return add_cone(
-        bm, (a + b) * 0.5, r1, r2, length, segments, mat_idx,
-        euler=(eul.x, eul.y, eul.z),
-    )
-
-
-def add_cone(bm, loc, radius1, radius2, depth, segments, mat_idx, euler=(0.0, 0.0, 0.0)):
-    geo = bmesh.ops.create_cone(
-        bm,
-        cap_ends=True,
-        cap_tris=False,
-        segments=segments,
-        radius1=radius1,
-        radius2=radius2,
-        depth=depth,
+    tangent = delta.normalized()
+    side = Vector((-tangent.y, tangent.x, 0.0))
+    if side.length < 1e-6:
+        side = Vector((1.0, 0.0, 0.0))
+    else:
+        side.normalize()
+    up = tangent.cross(side).normalized()
+    rings = []
+    for t, radius in profile:
+        p = a + tangent * (t * length)
+        if radius <= 1e-8:
+            rings.append([bm.verts.new(p)])
+            continue
+        ring = []
+        for i in range(segs):
+            ang = 2.0 * math.pi * i / segs
+            ring.append(
+                bm.verts.new(
+                    p
+                    + side * (radius * math.cos(ang))
+                    + up * (radius * math.sin(ang))
+                )
+            )
+        rings.append(ring)
+    return loft_rings(bm, rings, mat_idx, cap_start=cap_start, cap_end=cap_end)
+
+
+def add_cup_along(bm, origin, tangent, r_in, r_out, height, segs, mat_idx, floor=FERRULE_FLOOR):
+    """Closed iron shoe coaxial with the pole.
+
+    `origin` is the intended ground station of the pole foot. The cup is
+    shifted along `tangent` so the downhill outer rim sits at Z=0 —
+    a world-Z bucket lets a leaning pole slice the lip. Returns the
+    shifted origin (axis point of the outer floor).
+    """
+    t = Vector(tangent).normalized()
+    o = Vector(origin)
+    side = Vector((-t.y, t.x, 0.0))
+    if side.length < 1e-6:
+        side = Vector((1.0, 0.0, 0.0))
+    else:
+        side.normalize()
+    up = t.cross(side).normalized()
+    lean = math.sqrt(max(0.0, 1.0 - t.z * t.z))
+    o = o + t * ((r_out * lean) / max(t.z, 0.25))
+    specs = (
+        (0.0, r_out),
+        (height, r_out),
+        (height, r_in),
+        (floor, r_in),
     )
-    verts = list(geo["verts"])
-    rot = Euler(euler).to_matrix()
-    origin = Vector(loc)
-    for v in verts:
-        v.co = rot @ v.co + origin
-    faces = {f for v in verts for f in v.link_faces}
-    for f in faces:
-        f.material_index = mat_idx
-    return verts
-
-
-def add_cylinder(bm, loc, radius, depth, segments, mat_idx, euler=(0.0, 0.0, 0.0)):
-    return add_cone(bm, loc, radius, radius, depth, segments, mat_idx, euler=euler)
+    rings = []
+    for dist, r in specs:
+        p = o + t * dist
+        ring = []
+        for i in range(segs):
+            a = 2.0 * math.pi * i / segs
+            ring.append(
+                bm.verts.new(
+                    p + side * (r * math.cos(a)) + up * (r * math.sin(a))
+                )
+            )
+        rings.append(ring)
+    loft_rings(bm, rings, mat_idx, cap_start=True, cap_end=True)
+    return o, t
 
 
-def add_rim(bm, loc, major, minor, mat_idx, euler=(0.0, 0.0, 0.0)):
-    n_major = 12
-    n_minor = 6
+def add_torus(bm, loc, major, minor, n_major, n_minor, mat_idx, euler=(0.0, 0.0, 0.0)):
     rings = []
     for i in range(n_major):
         u = i * (2.0 * math.pi / n_major)
@@ -187,6 +288,7 @@ def add_rim(bm, loc, major, minor, mat_idx, euler=(0.0, 0.0, 0.0)):
             z = minor * math.sin(v)
             ring.append(bm.verts.new((x, y, z)))
         rings.append(ring)
+    verts = [v for ring in rings for v in ring]
     for i in range(n_major):
         i2 = (i + 1) % n_major
         for j in range(n_minor):
@@ -195,7 +297,6 @@ def add_rim(bm, loc, major, minor, mat_idx, euler=(0.0, 0.0, 0.0)):
                 (rings[i][j], rings[i2][j], rings[i2][j2], rings[i][j2])
             )
             face.material_index = mat_idx
-    verts = [v for ring in rings for v in ring]
     rot = Euler(euler).to_matrix()
     origin = Vector(loc)
     for v in verts:
@@ -203,6 +304,33 @@ def add_rim(bm, loc, major, minor, mat_idx, euler=(0.0, 0.0, 0.0)):
     return verts
 
 
+def add_pipe_curve(bm, points, radius, segs, mat_idx):
+    rings = []
+    n = len(points)
+    for i, p in enumerate(points):
+        p = Vector(p)
+        if i < n - 1:
+            tangent = (Vector(points[i + 1]) - p).normalized()
+        else:
+            tangent = (p - Vector(points[i - 1])).normalized()
+        side = Vector((-tangent.y, tangent.x, 0.0))
+        if side.length < 1e-6:
+            side = Vector((1.0, 0.0, 0.0))
+        else:
+            side.normalize()
+        up = tangent.cross(side).normalized()
+        ring = []
+        for k in range(segs):
+            a = 2.0 * math.pi * k / segs
+            ring.append(
+                bm.verts.new(
+                    p + side * (radius * math.cos(a)) + up * (radius * math.sin(a))
+                )
+            )
+        rings.append(ring)
+    return loft_rings(bm, rings, mat_idx, cap_start=True, cap_end=True)
+
+
 def pack_uvs(bm, margin=0.08):
     uv = bm.loops.layers.uv.new("UVMap")
     faces = list(bm.faces)
@@ -219,9 +347,7 @@ def pack_uvs(bm, margin=0.08):
         col = i % cols
         row = i // cols
         nrm = face.normal
-        ax = abs(nrm.x)
-        ay = abs(nrm.y)
-        az = abs(nrm.z)
+        ax, ay, az = abs(nrm.x), abs(nrm.y), abs(nrm.z)
         coords = []
         for loop in face.loops:
             co = loop.vert.co
@@ -248,36 +374,63 @@ def pack_uvs(bm, margin=0.08):
 
 def pot_radius(z_local):
     t = max(0.0, min(1.0, z_local / POT_H))
-    return (1.0 - t) ** 2 * R_BOT + 2.0 * t * (1.0 - t) * (R_MID * 1.35) + t ** 2 * R_TOP
+    return (
+        (1.0 - t) ** 2 * R_BOT
+        + 2.0 * t * (1.0 - t) * (R_MID * 1.32)
+        + t ** 2 * R_TOP
+    )
+
+
+def pole_feet():
+    feet = []
+    for i in range(3):
+        ang = i * (2.0 * math.pi / 3.0) + POLE_OFFSET
+        feet.append(Vector((TRIPOD_R * math.cos(ang), TRIPOD_R * math.sin(ang), 0.0)))
+    return feet
 
 
-def build_cauldron_mesh(name, bevel_offset, bevel_segments):
+def build_cauldron_mesh(
+    name,
+    short_legs=False,
+    float_hook=False,
+    pipe_ferrule=False,
+):
     bm = bmesh.new()
     wood_verts = []
-    metal_faces = set()
-    pot_verts = []
     try:
-        # Shared-vertex lathe: one continuous iron shell, not overlapping
-        # stave panels (those read as a gold grid under studio lighting).
+        # Dual-wall lathe plus a rolled rim. No overlapping torus, no
+        # extra bottom cylinder — those left a hole in the floor and a
+        # faceted lip sitting on the mouth.
         zs = [POT_H * i / (N_RINGS - 1) for i in range(N_RINGS)]
-        outers = []
-        inners = []
+        rim = (
+            (POT_H + 0.004, R_TOP + 0.012),
+            (POT_H + 0.010, R_TOP + 0.018),
+            (POT_H + 0.014, R_TOP + 0.014),
+            (POT_H + 0.011, R_TOP + 0.006),
+        )
+        outers, inners = [], []
         for z_local in zs:
             z = POT_Z0 + z_local
             r = pot_radius(z_local)
-            ri = max(r - POT_THICK, 0.018)
-            oring = []
-            iring = []
+            ri = max(r - POT_THICK, 0.014)
+            oring, iring = [], []
+            for i in range(N_AROUND):
+                a = 2.0 * math.pi * i / N_AROUND
+                oring.append(bm.verts.new((r * math.cos(a), r * math.sin(a), z)))
+                iring.append(bm.verts.new((ri * math.cos(a), ri * math.sin(a), z)))
+            outers.append(oring)
+            inners.append(iring)
+        for z_off, r in rim:
+            z = POT_Z0 + z_off
+            ri = max(r - POT_THICK, 0.014)
+            oring, iring = [], []
             for i in range(N_AROUND):
                 a = 2.0 * math.pi * i / N_AROUND
-                ov = bm.verts.new((r * math.cos(a), r * math.sin(a), z))
-                iv = bm.verts.new((ri * math.cos(a), ri * math.sin(a), z))
-                oring.append(ov)
-                iring.append(iv)
-                pot_verts.extend((ov, iv))
+                oring.append(bm.verts.new((r * math.cos(a), r * math.sin(a), z)))
+                iring.append(bm.verts.new((ri * math.cos(a), ri * math.sin(a), z)))
             outers.append(oring)
             inners.append(iring)
-        for k in range(N_RINGS - 1):
+        for k in range(len(outers) - 1):
             for i in range(N_AROUND):
                 j = (i + 1) % N_AROUND
                 fo = bm.faces.new(
@@ -290,106 +443,117 @@ def build_cauldron_mesh(name, bevel_offset, bevel_segments):
                 fi.material_index = METAL_IDX
         for i in range(N_AROUND):
             j = (i + 1) % N_AROUND
-            bot = bm.faces.new(
-                (outers[0][j], outers[0][i], inners[0][i], inners[0][j])
-            )
-            bot.material_index = METAL_IDX
-            rim = bm.faces.new(
+            lip = bm.faces.new(
                 (outers[-1][i], outers[-1][j], inners[-1][j], inners[-1][i])
             )
-            rim.material_index = METAL_IDX
+            lip.material_index = METAL_IDX
+        oc = bm.verts.new((0.0, 0.0, POT_Z0))
+        ic = bm.verts.new((0.0, 0.0, POT_Z0 + POT_THICK))
+        for i in range(N_AROUND):
+            j = (i + 1) % N_AROUND
+            bot = bm.faces.new((oc, outers[0][j], outers[0][i]))
+            bot.material_index = METAL_IDX
+            ibot = bm.faces.new((ic, inners[0][i], inners[0][j]))
+            ibot.material_index = METAL_IDX
 
-        before = set(bm.faces)
-        add_cylinder(
-            bm,
-            (0.0, 0.0, POT_Z0 + POT_THICK * 0.6),
-            pot_radius(0.0) - POT_THICK * 0.2,
-            POT_THICK * 1.2,
-            16,
-            METAL_IDX,
-        )
         mouth_z = POT_Z0 + POT_H
-        add_rim(bm, (0.0, 0.0, mouth_z), R_TOP + 0.008, 0.012, METAL_IDX)
-        ear_x = R_TOP + 0.012
+        # Vertical rings (hole along Y) so the XZ bail can thread them.
+        ear_x = R_TOP + 0.008
+        ear_z = mouth_z + 0.002
         for sign in (-1.0, 1.0):
-            add_box(bm, (sign * ear_x, 0.0, mouth_z - 0.01), (0.024, 0.030, 0.040), METAL_IDX)
-            add_rim(
+            add_torus(
                 bm,
-                (sign * (ear_x + 0.004), 0.0, mouth_z + 0.008),
-                0.014,
-                0.005,
+                (sign * ear_x, 0.0, ear_z),
+                EAR_MAJOR,
+                EAR_MINOR,
+                14,
+                6,
                 METAL_IDX,
-                euler=(math.radians(90.0), 0.0, 0.0),
+                euler=(math.pi / 2.0, 0.0, 0.0),
             )
-        bail_major = ear_x + 0.004
+        # Semicircle through the ear holes, ends past the rings.
+        t0 = -0.42
+        t1 = math.pi + 0.42
         bail_pts = []
         for i in range(BAIL_SEGS + 1):
-            t = math.pi * i / BAIL_SEGS
+            t = t0 + (t1 - t0) * i / BAIL_SEGS
             bail_pts.append(
-                (
-                    bail_major * math.cos(t),
-                    0.0,
-                    mouth_z + 0.008 + bail_major * math.sin(t),
-                )
-            )
-        for a, b in zip(bail_pts, bail_pts[1:]):
-            add_oriented_box(bm, a, b, (BAIL_R * 2.0, BAIL_R * 2.0), METAL_IDX)
-        metal_faces.update(set(bm.faces) - before)
-
-        pole_feet = []
-        for i in range(3):
-            ang = i * (2.0 * math.pi / 3.0) + math.radians(18.0)
-            foot = Vector((TRIPOD_R * math.cos(ang), TRIPOD_R * math.sin(ang), 0.016))
-            apex = Vector((0.0, 0.0, APEX_Z))
-            pole_feet.append(foot)
-            wood_verts.extend(add_cone_between(bm, foot, apex, 0.028, 0.018, 8, WOOD_IDX))
-            before = set(bm.faces)
-            add_cone_between(
-                bm,
-                foot + Vector((0.0, 0.0, 0.008)),
-                foot - Vector((0.0, 0.0, 0.014)),
-                0.032,
-                0.032,
-                8,
-                METAL_IDX,
+                (ear_x * math.cos(t), 0.0, ear_z + ear_x * math.sin(t))
             )
-            metal_faces.update(set(bm.faces) - before)
-
-        wood_verts.extend(add_cylinder(bm, (0.0, 0.0, APEX_Z - 0.02), 0.042, 0.055, 10, WOOD_IDX))
-        before = set(bm.faces)
-        hook_z1 = APEX_Z - 0.055
-        bail_peak = mouth_z + 0.008 + bail_major
-        add_cone_between(
+        add_pipe_curve(bm, bail_pts, BAIL_R, BAIL_PIPE, METAL_IDX)
+        bail_peak = Vector(bail_pts[len(bail_pts) // 2])
+        hook_z = bail_peak.z + (0.08 if float_hook else 0.0)
+        add_torus(
             bm,
-            (0.0, 0.0, hook_z1),
-            (0.0, 0.0, bail_peak + 0.012),
-            0.010,
-            0.010,
-            8,
+            (0.0, 0.0, hook_z),
+            BAIL_R + HOOK_R * 0.85,
+            HOOK_R,
+            12,
+            6,
             METAL_IDX,
+            euler=(0.0, math.radians(90.0), 0.0),
         )
-        add_rim(
+        crown_z0 = APEX_Z - CROWN_H
+        lathe_axis(
             bm,
-            (0.0, 0.0, bail_peak + 0.004),
-            0.018,
-            0.006,
+            (0.0, 0.0, hook_z + HOOK_R),
+            (0.0, 0.0, crown_z0 + 0.008),
+            ((0.0, HOOK_R * 0.9), (1.0, HOOK_R * 0.9)),
+            8,
             METAL_IDX,
-            euler=(math.radians(90.0), 0.0, 0.0),
         )
-        metal_faces.update(set(bm.faces) - before)
-
-        if bevel_offset > 0.0:
-            edges = list({e for v in wood_verts for e in v.link_edges if v.is_valid})
-            if edges:
-                bmesh.ops.bevel(
-                    bm,
-                    geom=edges,
-                    offset=bevel_offset,
-                    segments=bevel_segments,
-                    profile=0.5,
-                    affect="EDGES",
-                    clamp_overlap=True,
-                )
+
+        lathe_z(
+            bm,
+            (
+                (0.000, 0.032),
+                (0.018, 0.046),
+                (0.048, 0.042),
+                (CROWN_H, 0.026),
+            ),
+            16,
+            WOOD_IDX,
+            z0=crown_z0,
+        )
+        feet = pole_feet()
+        ferrule_z0 = 0.05 if short_legs else 0.0
+        if short_legs:
+            geo = bmesh.ops.create_cube(bm, size=1.0)
+            for v in geo["verts"]:
+                v.co.x *= 0.024
+                v.co.y *= 0.024
+                v.co.z *= 0.006
+                v.co.z += 0.003
+            for f in {f for v in geo["verts"] for f in v.link_faces}:
+                f.material_index = METAL_IDX
+        for foot in feet:
+            ang = math.atan2(foot.y, foot.x)
+            top = Vector((
+                INSERT_R * math.cos(ang),
+                INSERT_R * math.sin(ang),
+                APEX_Z - 0.030,
+            ))
+            origin = Vector((foot.x, foot.y, ferrule_z0))
+            tangent = (top - origin).normalized()
+            r_in = POLE_R_FOOT + 0.002
+            r_out = r_in + FERRULE_T
+            lean = math.sqrt(max(0.0, 1.0 - tangent.z * tangent.z))
+            shifted = origin + tangent * ((r_out * lean) / max(tangent.z, 0.25))
+            add_cup_along(
+                bm, origin, tangent, r_in, r_out, FERRULE_H,
+                FERRULE_SEGS, METAL_IDX,
+            )
+            # Same shoe either way so AABB/zmin stay put. --pipe-ferrule
+            # starts the pole above the well; ferrule_bite only samples
+            # wood inside the cup's own axis span, so a hovering pole
+            # cannot fake a seat.
+            seat = FERRULE_H + 0.05 if pipe_ferrule else (FERRULE_FLOOR + 0.002)
+            bot = shifted + tangent * seat
+            lathe_axis(
+                bm, bot, top,
+                ((0.0, POLE_R_FOOT), (1.0, POLE_R_TOP)),
+                POLE_SEGS, WOOD_IDX,
+            )
 
         pack_uvs(bm)
         bmesh.ops.recalc_face_normals(bm, faces=list(bm.faces))
@@ -398,11 +562,8 @@ def build_cauldron_mesh(name, bevel_offset, bevel_segments):
         for edge in bm.edges:
             edge.smooth = True
             if edge.is_manifold and len(edge.link_faces) == 2:
-                if edge.calc_face_angle() > math.radians(70.0):
+                if edge.calc_face_angle() > math.radians(55.0):
                     edge.smooth = False
-        for f in metal_faces:
-            if f.is_valid:
-                f.material_index = METAL_IDX
         me = bpy.data.meshes.new(name)
         bm.to_mesh(me)
         me.update()
@@ -412,27 +573,45 @@ def build_cauldron_mesh(name, bevel_offset, bevel_segments):
     bpy.context.collection.objects.link(obj)
     return obj
 
-def principled(name, color, metallic, roughness):
+
+def principled(name, color, metallic, roughness, noise_scale=0.0, wear=None):
     mat = bpy.data.materials.new(name)
     mat.use_nodes = True
-    bsdf = mat.node_tree.nodes["Principled BSDF"]
+    nt = mat.node_tree
+    bsdf = nt.nodes["Principled BSDF"]
     bsdf.inputs["Base Color"].default_value = color
     bsdf.inputs["Metallic"].default_value = metallic
     bsdf.inputs["Roughness"].default_value = roughness
+    if noise_scale > 0.0 and wear is not None:
+        tex = nt.nodes.new("ShaderNodeTexNoise")
+        tex.inputs["Scale"].default_value = noise_scale
+        tex.inputs["Detail"].default_value = 8.0
+        tex.inputs["Roughness"].default_value = 0.55
+        mix = nt.nodes.new("ShaderNodeMix")
+        mix.data_type = "RGBA"
+        mix.inputs["A"].default_value = color
+        mix.inputs["B"].default_value = wear
+        fac = mix.inputs.get("Factor") or mix.inputs.get("Fac")
+        nt.links.new(tex.outputs["Fac"], fac)
+        nt.links.new(mix.outputs["Result"], bsdf.inputs["Base Color"])
+        rmix = nt.nodes.new("ShaderNodeMix")
+        rmix.data_type = "FLOAT"
+        rmix.inputs["A"].default_value = roughness
+        rmix.inputs["B"].default_value = min(1.0, roughness + 0.18)
+        rfac = rmix.inputs.get("Factor") or rmix.inputs.get("Fac")
+        nt.links.new(tex.outputs["Fac"], rfac)
+        nt.links.new(rmix.outputs["Result"], bsdf.inputs["Roughness"])
     return mat
 
 
 def assign_slots(obj, wood, metal):
     mats = obj.data.materials
-    if len(mats) == 0:
-        mats.append(wood)
-        mats.append(metal)
-        return
-    mats[0] = wood
-    if len(mats) == 1:
-        mats.append(metal)
-    else:
-        mats[1] = metal
+    wanted = (wood, metal)
+    for i, mat in enumerate(wanted):
+        if i < len(mats):
+            mats[i] = mat
+        else:
+            mats.append(mat)
 
 
 def world_bbox(obj):
@@ -444,15 +623,7 @@ def world_bbox(obj):
 
 
 def pot_tripod_clearance(mesh):
-    # Recomputed from verts vs the three pole axes. Leg verts sit on the
-    # axes and are skipped; remaining shell verts in the pot band must
-    # clear the pole radius.
-    feet = []
-    for i in range(3):
-        ang = i * (2.0 * math.pi / 3.0) + math.radians(18.0)
-        feet.append(
-            Vector((TRIPOD_R * math.cos(ang), TRIPOD_R * math.sin(ang), 0.016))
-        )
+    feet = pole_feet()
     apex = Vector((0.0, 0.0, APEX_Z))
     z0 = POT_Z0 - 0.02
     z1 = POT_Z0 + POT_H + 0.03
@@ -472,7 +643,7 @@ def pot_tripod_clearance(mesh):
                 continue
             t = max(0.0, min(1.0, (p - foot).dot(ab) / denom))
             axis = (p - (foot + t * ab)).length
-            rad = 0.028 * (1.0 - t) + 0.018 * t
+            rad = POLE_R_FOOT * (1.0 - t) + POLE_R_TOP * t
             gap = axis - rad
             if axis < rad + 0.006:
                 on_pole = True
@@ -511,6 +682,268 @@ def uv_stats(mesh):
     return min(us), min(vs), max(us), max(vs), overlap, len(aabbs)
 
 
+def face_area(me, poly):
+    idxs = poly.vertices
+    if len(idxs) < 3:
+        return 0.0
+    v0 = me.vertices[idxs[0]].co
+    area = 0.0
+    for i in range(1, len(idxs) - 1):
+        vs = (me.vertices[idxs[i]].co, me.vertices[idxs[i + 1]].co)
+        area += (vs[0] - v0).cross(vs[1] - v0).length * 0.5
+    return area
+
+
+def hygiene_audit(me):
+    nv, ne, nf = len(me.vertices), len(me.edges), len(me.polygons)
+    ngons = sum(1 for p in me.polygons if len(p.vertices) > 4)
+    zero_area = sum(1 for p in me.polygons if face_area(me, p) <= AREA_EPS)
+    bm = bmesh.new()
+    try:
+        bm.from_mesh(me)
+        bm.verts.ensure_lookup_table()
+        bm.edges.ensure_lookup_table()
+        loose_v = sum(1 for v in bm.verts if len(v.link_edges) == 0)
+        loose_e = sum(1 for e in bm.edges if len(e.link_faces) == 0)
+        nonman = sum(1 for e in bm.edges if not e.is_manifold)
+        ret = bmesh.ops.find_doubles(bm, verts=list(bm.verts), dist=DOUBLES_EPS)
+        doubles = len(ret.get("targetmap") or {})
+    finally:
+        bm.free()
+    return {
+        "nv": nv, "ne": ne, "nf": nf, "ngons": ngons,
+        "loose_v": loose_v, "loose_e": loose_e, "nonman": nonman,
+        "zero_area": zero_area, "doubles": doubles, "euler": nv - ne + nf,
+    }
+
+
+def zfight_pairs(me):
+    data = [
+        (p.center.copy(), p.normal.copy(), frozenset(p.vertices))
+        for p in me.polygons
+    ]
+    eps2 = ZFIGHT_EPS * ZFIGHT_EPS
+    count = 0
+    for i in range(len(data)):
+        ci, ni, vi = data[i]
+        for j in range(i + 1, len(data)):
+            cj, nj, vj = data[j]
+            if (cj - ci).length_squared > eps2:
+                continue
+            if abs(ni.dot(nj)) <= ZFIGHT_COS:
+                continue
+            if vi & vj:
+                continue
+            count += 1
+    return count
+
+
+def shells(me):
+    neighbors = [[] for _ in range(len(me.vertices))]
+    for edge in me.edges:
+        a, b = edge.vertices
+        neighbors[a].append(b)
+        neighbors[b].append(a)
+    seen = [False] * len(me.vertices)
+    groups = []
+    for start in range(len(me.vertices)):
+        if seen[start]:
+            continue
+        seen[start] = True
+        stack = [start]
+        group = []
+        while stack:
+            current = stack.pop()
+            group.append(current)
+            for nxt in neighbors[current]:
+                if not seen[nxt]:
+                    seen[nxt] = True
+                    stack.append(nxt)
+        groups.append(group)
+    return groups
+
+
+def shell_aabb(me, group):
+    pts = [me.vertices[i].co for i in group]
+    return (
+        min(p.x for p in pts), min(p.y for p in pts), min(p.z for p in pts),
+        max(p.x for p in pts), max(p.y for p in pts), max(p.z for p in pts),
+    )
+
+
+def mat_of(me, group):
+    member = set(group)
+    for p in me.polygons:
+        if all(i in member for i in p.vertices):
+            return p.material_index
+    return None
+
+
+def support_audit(me):
+    groups = shells(me)
+    cups = []
+    for g in groups:
+        if mat_of(me, g) != METAL_IDX:
+            continue
+        a = shell_aabb(me, g)
+        dx, dy, dz = a[3] - a[0], a[4] - a[1], a[5] - a[2]
+        if a[5] < 0.14 and dx > 0.03 and dy > 0.03 and dz < 0.12:
+            cups.append(a)
+    cup_z = min((a[2] for a in cups), default=99.0)
+    return {"cups": len(cups), "cup_z": cup_z}
+
+
+def pot_audit(me):
+    groups = shells(me)
+    best = None
+    best_r = -1.0
+    for g in groups:
+        if mat_of(me, g) != METAL_IDX:
+            continue
+        a = shell_aabb(me, g)
+        dx, dy, dz = a[3] - a[0], a[4] - a[1], a[5] - a[2]
+        r = 0.5 * 0.5 * (dx + dy)
+        if dz > 0.20 and r > best_r:
+            best_r = r
+            best = a
+    if best is None:
+        return {"dia": 0.0, "height": 0.0}
+    return {
+        "dia": 0.5 * ((best[3] - best[0]) + (best[4] - best[1])),
+        "height": best[5] - best[2],
+    }
+
+
+def hook_bail_join(me):
+    """Worst gap from the compact hook ring to the bail pipe."""
+    groups = shells(me)
+    hooks, bails = [], []
+    for g in groups:
+        if mat_of(me, g) != METAL_IDX:
+            continue
+        a = shell_aabb(me, g)
+        dx, dy, dz = a[3] - a[0], a[4] - a[1], a[5] - a[2]
+        cz = 0.5 * (a[2] + a[5])
+        if cz > 0.55 and max(dx, dy, dz) < 0.08:
+            hooks.append(g)
+        elif dz > 0.12 and a[2] > 0.35 and max(dx, dy) > 0.20:
+            bails.append(g)
+    if not hooks or not bails:
+        return 99.0
+    bm_b = bmesh.new()
+    try:
+        bm_b.from_mesh(me)
+        keep = set()
+        for g in bails:
+            keep.update(g)
+        drop = [
+            f for f in bm_b.faces
+            if not all(v.index in keep for v in f.verts)
+        ]
+        if drop:
+            bmesh.ops.delete(bm_b, geom=drop, context="FACES")
+        if not bm_b.faces:
+            return 99.0
+        tree = BVHTree.FromBMesh(bm_b)
+        worst = 0.0
+        for g in hooks:
+            bm_h = bmesh.new()
+            try:
+                bm_h.from_mesh(me)
+                member = set(g)
+                drop_h = [
+                    f for f in bm_h.faces
+                    if not all(v.index in member for v in f.verts)
+                ]
+                if drop_h:
+                    bmesh.ops.delete(bm_h, geom=drop_h, context="FACES")
+                if not bm_h.faces:
+                    worst = max(worst, 99.0)
+                    continue
+                tree_h = BVHTree.FromBMesh(bm_h)
+                if tree.overlap(tree_h):
+                    continue
+                best = 99.0
+                for i in g:
+                    hit = tree.find_nearest(me.vertices[i].co)
+                    if hit[0] is None:
+                        continue
+                    best = min(best, hit[3])
+                if best > worst:
+                    worst = best
+            finally:
+                bm_h.free()
+        return worst
+    finally:
+        bm_b.free()
+
+
+def ferrule_bite(me):
+    """Pole radius minus cup inner wall, in the pole's own frame.
+
+    World-XY distance lies about a leaning pole that is coaxial with its
+    shoe: the foot sits on the axis while the rim is offset in XY, so a
+    vertical-bucket metric reports a false gap. Measure radial distance
+    from the pole axis instead.
+    """
+    groups = shells(me)
+    cups, woods = [], []
+    for g in groups:
+        a = shell_aabb(me, g)
+        if mat_of(me, g) == METAL_IDX and a[5] < 0.12 and (a[5] - a[2]) < 0.10:
+            cups.append(g)
+        elif mat_of(me, g) == WOOD_IDX and a[2] < 0.12 and (a[5] - a[2]) > 0.15:
+            woods.append(g)
+    if not cups or not woods:
+        return 0.0
+    feet = pole_feet()
+    apex = Vector((0.0, 0.0, APEX_Z))
+    wood_pts = [me.vertices[i].co.copy() for g in woods for i in g]
+    bites = []
+    for g in cups:
+        pts = [me.vertices[i].co.copy() for i in g]
+        centroid = sum(pts, Vector((0.0, 0.0, 0.0))) / len(pts)
+        foot = min(feet, key=lambda f: (f - centroid).length)
+        axis = apex - foot
+        if axis.length < 1e-8:
+            continue
+        axis.normalize()
+
+        def rad(p):
+            return (p - foot).cross(axis).length
+
+        wall = [rad(p) for p in pts if rad(p) > 0.010]
+        if not wall:
+            continue
+        r_in = min(wall)
+        span = [(p - foot).dot(axis) for p in pts]
+        t0, t1 = min(span), max(span)
+        near = [
+            p for p in wood_pts
+            if rad(p) > 0.010
+            and (p - centroid).length < 0.10
+            and (t0 - 0.002) <= (p - foot).dot(axis) <= (t1 + 0.002)
+        ]
+        if not near:
+            continue
+        r_wood = min(rad(p) for p in near)
+        bites.append(r_wood - r_in)
+    if not bites:
+        return 0.05
+    return min(bites)
+
+
+def add_stray_vert(me):
+    bm = bmesh.new()
+    try:
+        bm.from_mesh(me)
+        bm.verts.new((0.0, 0.0, APEX_Z))
+        bm.to_mesh(me)
+        me.update()
+    finally:
+        bm.free()
+
+
 def make_lod(obj, name, ratio, skip_decimate):
     mesh = obj.data.copy()
     lod = bpy.data.objects.new(name, mesh)
@@ -524,7 +957,6 @@ def make_lod(obj, name, ratio, skip_decimate):
 
 
 def convex_hull_collider(obj, name):
-    # Duplicated from snippets/convex_hull_collider.py (not a package).
     mesh = bpy.data.meshes.new(name)
     bm = bmesh.new()
     try:
@@ -547,7 +979,6 @@ def convex_hull_collider(obj, name):
 
 
 def setup_bake_image(obj, target_mat, size=BAKE_RES):
-    # Adapted from snippets/setup_bake_target_image.py — do not replace slots.
     if not obj.data.uv_layers:
         return None, None
     img = bpy.data.images.new("CauldronNrm", size, size, alpha=True, float_buffer=False)
@@ -562,7 +993,6 @@ def setup_bake_image(obj, target_mat, size=BAKE_RES):
 
 
 def bake_normal(high, low):
-    # Duplicated from snippets/bake_normal_high_to_low.py (not a package).
     scene = bpy.context.scene
     scene.render.engine = "CYCLES"
     scene.cycles.device = "CPU"
@@ -587,7 +1017,6 @@ def bake_normal(high, low):
 
 
 def export_unity(path, objects):
-    # Duplicated from snippets/export_preset_unity.py (not a package).
     for ob in bpy.context.view_layer.objects:
         ob.select_set(False)
     for ob in objects:
@@ -603,14 +1032,39 @@ def export_unity(path, objects):
     )
 
 
-def check(skip_decimate):
+def check(
+    skip_decimate,
+    lift_z=False,
+    stray_vert=False,
+    short_legs=False,
+    float_hook=False,
+    pipe_ferrule=False,
+):
     bpy.ops.wm.read_factory_settings(use_empty=True)
-    low = build_cauldron_mesh("CauldronLow", bevel_offset=0.003, bevel_segments=2)
-    high = build_cauldron_mesh("CauldronHigh", bevel_offset=0.003, bevel_segments=4)
-    wood = principled("TripodWood", (0.38, 0.22, 0.09, 1.0), 0.0, 0.58)
-    metal = principled("CauldronIron", (0.10, 0.095, 0.09, 1.0), 0.92, 0.40)
+    flags = dict(
+        short_legs=short_legs,
+        float_hook=float_hook,
+        pipe_ferrule=pipe_ferrule,
+    )
+    low = build_cauldron_mesh("CauldronLow", **flags)
+    high = build_cauldron_mesh("CauldronHigh", **flags)
+    wood = principled(
+        "TripodWood", (0.38, 0.22, 0.09, 1.0), 0.0, 0.58,
+        noise_scale=6.0, wear=(0.22, 0.12, 0.05, 1.0),
+    )
+    metal = principled(
+        "CauldronIron", (0.10, 0.095, 0.09, 1.0), 0.92, 0.40,
+        noise_scale=5.0, wear=(0.18, 0.16, 0.14, 1.0),
+    )
     assign_slots(low, wood, metal)
     assign_slots(high, wood, metal)
+    if stray_vert:
+        add_stray_vert(low.data)
+    if lift_z:
+        for v in low.data.vertices:
+            v.co.z += LIFT_Z
+        low.data.update()
+        bpy.context.view_layer.update()
 
     if low.data is None or len(low.data.polygons) < 6:
         return fail("cauldron mesh did not build", 3), None, None, None, None, None
@@ -650,7 +1104,7 @@ def check(skip_decimate):
     r1 = lod1_tris / base_tris if base_tris else 0.0
     r2 = lod2_tris / base_tris if base_tris else 0.0
 
-    collider_src = build_cauldron_mesh("CauldronColSrc", bevel_offset=0.0, bevel_segments=1)
+    collider_src = build_cauldron_mesh("CauldronColSrc", **flags)
     collider = convex_hull_collider(collider_src, "CauldronCollider")
     bpy.data.objects.remove(collider_src, do_unlink=True)
     col_tris = triangle_count(collider.data)
@@ -664,9 +1118,14 @@ def check(skip_decimate):
     export_unity(export_path, [low, collider])
     export_size = os.path.getsize(export_path) if os.path.isfile(export_path) else 0
 
-    print(
-        f"blender={tuple(bpy.app.version)} skip_decimate={skip_decimate}"
-    )
+    hyg = hygiene_audit(low.data)
+    zf = zfight_pairs(low.data)
+    sup = support_audit(low.data)
+    pot = pot_audit(low.data)
+    hj = hook_bail_join(low.data)
+    bite = ferrule_bite(low.data)
+
+    print(f"blender={tuple(bpy.app.version)} skip_decimate={skip_decimate}")
     print(
         f"measured base_tris={base_tris} lod1_tris={lod1_tris} "
         f"lod2_tris={lod2_tris} r1={r1:.4f} r2={r2:.4f}"
@@ -683,6 +1142,16 @@ def check(skip_decimate):
         f"measured collider_tris={col_tris} bake={bake_result} "
         f"bake_has_data={img.has_data} export_bytes={export_size}"
     )
+    print(
+        f"measured hygiene loose_v={hyg['loose_v']} loose_e={hyg['loose_e']} "
+        f"nonman={hyg['nonman']} zero_area={hyg['zero_area']} "
+        f"doubles={hyg['doubles']} ngons={hyg['ngons']} zfight={zf}"
+    )
+    print(
+        f"measured supports cups={sup['cups']} cup_z={sup['cup_z']:.5f} "
+        f"pot_dia={pot['dia']:.4f} pot_h={pot['height']:.4f} "
+        f"hook_join={hj:.5f} ferrule_bite={bite:.5f}"
+    )
 
     if not (BASE_TRIS_MIN <= base_tris <= BASE_TRIS_MAX):
         return fail(
@@ -747,6 +1216,51 @@ def check(skip_decimate):
         ), None, None, None, None, None
     if export_size <= 0:
         return fail("export file missing or empty", 13), None, None, None, None, None
+    if (
+        hyg["loose_v"] or hyg["loose_e"] or hyg["nonman"]
+        or hyg["zero_area"] or hyg["doubles"] or hyg["ngons"] or zf
+    ):
+        return fail(
+            f"hygiene loose_v={hyg['loose_v']} loose_e={hyg['loose_e']} "
+            f"nonman={hyg['nonman']} zero_area={hyg['zero_area']} "
+            f"doubles={hyg['doubles']} ngons={hyg['ngons']} zfight={zf}",
+            15,
+        ), None, None, None, None, None
+    if abs(bb[2]) > ZMIN_EPS:
+        return fail(
+            f"zmin {bb[2]:.6f} not within {ZMIN_EPS} of 0 "
+            "(--lift-z is the designed fail)",
+            16,
+        ), None, None, None, None, None
+    if sup["cups"] < 3 or sup["cup_z"] > FERRULE_Z_MAX:
+        return fail(
+            f"ferrule supports {sup['cups']} cup_z={sup['cup_z']:.5f} "
+            "(--short-legs is the designed fail)",
+            16,
+        ), None, None, None, None, None
+    if hj > HOOK_JOIN:
+        return fail(
+            f"hook-bail gap {hj:.5f} > {HOOK_JOIN} "
+            "(--float-hook is the designed fail)",
+            17,
+        ), None, None, None, None, None
+    if not (FERRULE_BITE_MIN <= bite <= FERRULE_BITE_MAX):
+        return fail(
+            f"ferrule bite {bite:.5f} not in "
+            f"[{FERRULE_BITE_MIN}, {FERRULE_BITE_MAX}] "
+            "(--pipe-ferrule is the designed fail)",
+            18,
+        ), None, None, None, None, None
+    if abs(pot["dia"] - BODY_DIA) > BODY_DIA_TOL:
+        return fail(
+            f"pot diameter {pot['dia']:.4f} off {BODY_DIA}",
+            19,
+        ), None, None, None, None, None
+    if abs(pot["height"] - BODY_H) > BODY_H_TOL:
+        return fail(
+            f"pot height {pot['height']:.4f} off {BODY_H}",
+            19,
+        ), None, None, None, None, None
     return 0, low, high, wood, tex, collider
 
 
@@ -860,14 +1374,22 @@ def main():
     p = argparse.ArgumentParser()
     p.add_argument("--output", default=None)
     p.add_argument("--engine", default="eevee", choices=("eevee", "cycles"))
-    p.add_argument(
-        "--skip-decimate",
-        action="store_true",
-        help="falsification: skip the LOD DECIMATE stage",
-    )
+    p.add_argument("--skip-decimate", action="store_true")
+    p.add_argument("--lift-z", action="store_true")
+    p.add_argument("--stray-vert", action="store_true")
+    p.add_argument("--short-legs", action="store_true")
+    p.add_argument("--float-hook", action="store_true")
+    p.add_argument("--pipe-ferrule", action="store_true")
     args = p.parse_args(argv)
 
-    code, low, _high, wood, tex, _col = check(args.skip_decimate)
+    code, low, _high, wood, tex, _col = check(
+        args.skip_decimate,
+        lift_z=args.lift_z,
+        stray_vert=args.stray_vert,
+        short_legs=args.short_legs,
+        float_hook=args.float_hook,
+        pipe_ferrule=args.pipe_ferrule,
+    )
     if code:
         return code
     if args.output:
diff --git a/showcase/iron-cauldron/preview.webp b/showcase/iron-cauldron/preview.webp
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From 173621dbf2f4c210bdd389c03e913fa175ee1f78 Mon Sep 17 00:00:00 2001
From: TMHSDigital <154358121+TMHSDigital@users.noreply.github.com>
Date: Wed, 16 Sep 2026 16:59:46 -0400
Subject: [PATCH 2/2] fix(showcase): lock shipping-crate tenons and filleted
 handles as hygiene budgets

Posts hung over a skid cave and 90-degree handle lofts sat on the plates. Shared post/skid planes and quarter-circle bails close those joints without magic offsets.

Signed-off-by: TMHSDigital <154358121+TMHSDigital@users.noreply.github.com>
Co-authored-by: Cursor 
---
 docs/gallery/assets/shipping-crate-hero.webp | Bin 12172 -> 34240 bytes
 docs/gallery/index.html                      |   4 +-
 docs/gallery/shipping-crate/index.html       | 893 +++++++++++++++----
 showcase/gallery.json                        |   4 +-
 showcase/shipping-crate/README.md            |  92 +-
 showcase/shipping-crate/preview.webp         | Bin 11272 -> 19926 bytes
 showcase/shipping-crate/shipping_crate.py    | 863 ++++++++++++++----
 7 files changed, 1524 insertions(+), 332 deletions(-)

diff --git a/docs/gallery/assets/shipping-crate-hero.webp b/docs/gallery/assets/shipping-crate-hero.webp
index 588b8d668f697b1812e98b1a261529fd03c96ff5..abcf26fc7f519a3b5e3d4ce4405bbc93998e5ed6 100644
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diff --git a/docs/gallery/index.html b/docs/gallery/index.html
index 3ec19a1..fbf6b53 100644
--- a/docs/gallery/index.html
+++ b/docs/gallery/index.html
@@ -892,7 +892,7 @@ 
gn-socket-rename

         

           
shipping-crate

           
A procedural shipping crate through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.

-          
witnesses Recomputed: 624 tris, two materials with 132 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.352×0.856×0.748 m, LOD ratios in band (5.2 COLLAPSE more aggressive), convex collider 36 tris, non-empty glTF. --skip-decimate exits 9 on the LOD1 ratio budget.

+          
witnesses Recomputed: 2508 tris, two materials with 1170 wood and 280 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.146×0.726×0.612 m, grounded zmin, 3 skids, handle-end and slat-post join 0, mesh hygiene all zero, LOD ratios in band (5.2 COLLAPSE leaner on LOD2), convex collider 76 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-skids 16; --float-handle 17; --omit-slats 18.

           View example 
         

       
@@ -1145,7 +1145,7 @@ 
tavern-stool

         

           
iron-cauldron

           
A procedural hanging iron cauldron with a bulged open pot, bail, and timber tripod through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.

-          
witnesses Recomputed: 3388 tris, two materials with 450 wood and 1198 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.013×0.986×0.827 m, pot–leg clearance 0.051 m, LOD ratios in band (5.2 COLLAPSE 8 tris leaner on LOD2), convex collider 98 tris, non-empty glTF. --skip-decimate exits 9 on the LOD1 ratio budget.

+          
witnesses Recomputed: 3664 tris, two materials with 224 wood and 1768 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.987×0.961×0.860 m, pot–leg clearance 0.046 m, 3 coaxial ferrules at zmin 0, ferrule bite −0.00185 m, hook-bail join 0, mesh hygiene all zero, LOD ratios in band, convex collider 250 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-legs 16; --float-hook 17; --pipe-ferrule 18.

           View example 
         

       
diff --git a/docs/gallery/shipping-crate/index.html b/docs/gallery/shipping-crate/index.html
index 5bb0ce7..13c584f 100644
--- a/docs/gallery/shipping-crate/index.html
+++ b/docs/gallery/shipping-crate/index.html
@@ -253,28 +253,42 @@ 
shipping-crate

       shipping-crate render
     
     
Rendered headless by the example itself — click to zoom.

-    
witnesses Recomputed: 624 tris, two materials with 132 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.352×0.856×0.748 m, LOD ratios in band (5.2 COLLAPSE more aggressive), convex collider 36 tris, non-empty glTF. --skip-decimate exits 9 on the LOD1 ratio budget.

+    
witnesses Recomputed: 2508 tris, two materials with 1170 wood and 280 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.146×0.726×0.612 m, grounded zmin, 3 skids, handle-end and slat-post join 0, mesh hygiene all zero, LOD ratios in band (5.2 COLLAPSE leaner on LOD2), convex collider 76 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-skids 16; --float-handle 17; --omit-slats 18.

     

       
blender --background --python showcase/shipping-crate/shipping_crate.py --

       
     

     

-
A showcase piece, not an example. Procedural crate (beveled body, arrayed slats, iron corner brackets and end handles, two materials) then the shipped pipeline: unique-cell UVs, Cycles high-to-low normal bake, LOD chain, convex collider, Unity glTF export.

+
A showcase piece, not an example. Procedural crate (skids under the posts, corner posts with tenoned slats and seeded width jitter, bottom sills, L-straps, filleted iron bail handles through mounting plates) then the shipped pipeline: unique-cell UVs, Cycles high-to-low normal bake, LOD chain, convex collider, Unity glTF export.

+
Skids sit under the posts so the outer corner is a mortise, not a cave. Handle bails use quarter-circle corners so a 90-degree loft cannot sit the bar on the plate.

 
It asserts budget conformance of the generated result. It does not witness an API contract. "It rendered without error" is not a check.

 
Composes skills mesh-editing-and-bmesh, bake-high-to-low, depsgraph-and-evaluated-data, engine-export-presets, and snippets bake_normal_high_to_low.py, setup_bake_target_image.py, lod_chain.py / decimate_to_budget.py, convex_hull_collider.py, export_preset_unity.py (helpers copied, not imported as a package).

 
Budgets

 
Declared as named constants; every gate recomputes from the mesh, materials, UVs, evaluated LOD, collider, or export file.

-
| Axis | Declared | Measured (4.5.11 / 5.1.2 / 5.2.1) | | --- | --- | --- | | Base triangles | 580–680 | 624 / 624 / 624 | | LOD1 ratio | 0.32–0.62 of base | 0.5000 / 0.5000 / 0.4455 | | LOD2 ratio | 0.10–0.35 of base | 0.2179 / 0.2179 / 0.1571 | | Materials | exactly 2 distinct, ≥24 metal faces | 2 slots, 180 wood, 132 metal | | UVs | in 0..1, AABB overlap ≤ 1e-5 | in range, overlap 0 | | Outer AABB | (1.352, 0.856, 0.748) m ± 0.01 | (1.3520, 0.8560, 0.7480), zmin 0 | | Collider tris | ≤ 48 | 36 | | Export | written, size > 0 | 50148 / 50148 / 50140 bytes |

-
DECIMATE COLLAPSE triangle counts are not identical across series — 5.2.1 is more aggressive. The gate is a ratio band, not an exact count. Bake pixels are stochastic; the gate is has_data plus operator FINISHED, not byte-identity. Construction uses no RNG.

-
--skip-decimate skips the LOD DECIMATE stage so LOD1 ratio is 1.0 and exit 9 fires. That is the named budget the falsifier violates.

+
| Axis | Declared | Measured (4.5.11 / 5.1.2 / 5.2.1) | | --- | --- | --- | | Base triangles | 1200–2800 | 2508 / 2508 / 2508 | | LOD1 ratio | 0.32–0.62 of base | 0.5000 / 0.5000 / 0.5000 | | LOD2 ratio | 0.10–0.35 of base | 0.2193 / 0.2193 / 0.2057 | | Materials | exactly 2 distinct; ≥200 wood, ≥48 metal faces | 2 slots; 1170 / 280 | | UVs | in 0..1, AABB overlap ≤ 1e-5 | in range, overlap 0 | | Outer AABB | (1.146, 0.726, 0.612) m ± 0.015 | (1.1460, 0.7260, 0.6120), zmin 0 | | Collider tris | ≤ 220 | 76 | | Export | written, size > 0 | 197408 / 197408 / 197392 bytes |

+
Base triangles rose from 624 to 2508 in the quality pass: the old beveled cube with glued-on slats became a post-and-slat crate with tenons, sills, L-straps, and pipe handles.

+
DECIMATE COLLAPSE triangle counts are not identical across series — 5.2.1 is leaner on LOD2. The gate is a ratio band, not an exact count. Bake pixels are stochastic; the gate is has_data plus operator FINISHED, not byte-identity. Slat-width jitter uses fixed seed 17. Export byte counts differ by 16 B on 5.2.1 (glTF serializer), not a gated axis.

+
Hygiene

+
Recomputed from the generated mesh, not asserted about the script.

+
| Axis | Declared | Measured (all three) | | --- | --- | --- | | Non-manifold edges | 0 | 0 | | Loose verts / edges | 0 / 0 | 0 / 0 | | Doubles merged at 1e-5 | 0 | 0 | | Zero-area faces | 0 | 0 | | N-gons | 0 | 0 | | Coplanar disjoint face pairs | 0 | 0 | | Grounded: zmin | within 1e-4 of 0 | 0.0000 | | Named supports: 3 skids | each zmin ≤ 1e-3 | 3, skid_z 0.00000 | | Body plan | 1.056 × 0.716 m ± 0.05 | 1.0560 × 0.7160 |

+
Joint fit and seat

+
| Axis | Declared | Measured (all three) | | --- | --- | --- | | Handle-end BVH gap | ≤ 0.008 m | 0.00000 | | Slat-post BVH gap | ≤ 0.006 m | 0.00000 |

+
Falsifiers

+
Each violates one named budget. All seven were run on 4.5.11, 5.1.2 and 5.2.1 and returned the same code on each.

+
| Flag | Budget violated | Exit | | --- | --- | --- | | --skip-decimate | LOD1 ratio band | 9 | | --stray-vert | loose vertex count is 0 | 15 | | --lift-z | bounding box zmin is 0 | 16 | | --short-skids | named skid supports at Z=0 | 16 | | --float-handle | handle-end gap | 17 | | --omit-slats | slat-post seat | 18 |

 
Run

 
blender --background --python shipping_crate.py --
 blender --background --python shipping_crate.py -- --skip-decimate
+blender --background --python shipping_crate.py -- --stray-vert
+blender --background --python shipping_crate.py -- --lift-z
+blender --background --python shipping_crate.py -- --short-skids
+blender --background --python shipping_crate.py -- --float-handle
+blender --background --python shipping_crate.py -- --omit-slats
 blender --background --python shipping_crate.py -- --output crate.png

-
Smoke does not pass --output or --skip-decimate.

+
Smoke passes no flags.

 
Exit codes

-
File-local. 9 is a valid check code. 10 is reserved for gallery_framing.check_framing on the --output path.

-
| Code | Meaning | | --- | --- | | 0 | Success | | 1 | Uncaught exception (FATAL wrapper) | | 2 | argparse / usage | | 3 | Mesh did not build / no UV layer | | 4 | Base triangle count outside range | | 5 | Material count ≠ 2 distinct slots, or metal faces missing | | 6 | UVs outside 0..1 | | 7 | UV AABB overlap above tolerance | | 8 | World AABB off declared outer size | | 9 | LOD ratio band (--skip-decimate lands here) | | 10 | Framing gate (render path only) | | 11 | Collider triangle count above ceiling | | 12 | Bake did not finish or image has no data | | 13 | Export file missing or empty | | 14 | --output produced no file |

+
File-local. 9 is a valid check code. 10 is reserved for gallery_framing.check_framing on the --output path. 15–19 are the hygiene and joint-fit family.

+
| Code | Meaning | | --- | --- | | 0 | Success | | 1 | Uncaught exception (FATAL wrapper) | | 2 | argparse / usage | | 3 | Mesh did not build / no UV layer | | 4 | Base triangle count outside range | | 5 | Material count ≠ 2 distinct slots, or a face-count floor missed | | 6 | UVs outside 0..1 | | 7 | UV AABB overlap above tolerance | | 8 | World AABB off declared outer size | | 9 | LOD ratio band (--skip-decimate lands here) | | 10 | Framing gate (render path only) | | 11 | Collider triangle count above ceiling | | 12 | Bake did not finish or image has no data | | 13 | Export file missing or empty | | 14 | --output produced no file | | 15 | Mesh hygiene: loose, non-manifold, zero-area, doubles, n-gons, z-fight | | 16 | Not grounded: bounding box zmin off 0, or a named skid floats | | 17 | Joint fit: handle-end gap | | 18 | Seat: slat-post gap | | 19 | Body plan off the stated real-world size |

     

     

       
Source

@@ -284,15 +298,24 @@ 
Source

       
       
"""Game-ready shipping crate — a showcase piece, not an example.
 
-Asserts budget conformance of a procedural crate after composing shipped
-pipeline pieces: bmesh construction, UVs, two materials, high-to-low
-normal bake, LOD chain, convex collider, Unity glTF export.
+Asserts budget conformance of a procedural crate (skids, corner posts,
+tenoned slats with seeded width jitter, L-straps, iron bail handles)
+after composing shipped pipeline pieces: bmesh construction, UVs, two
+materials, high-to-low normal bake, LOD chain, convex collider, Unity
+glTF export.
+
+The old piece was a solid beveled cube with identical slats glued on
+and three overlapping cubes per corner that left window-holes through
+the iron.
 
 Budgets are declared below and recomputed from the generated result.
-They are not API-contract witnesses. ``--skip-decimate`` skips the LOD
-DECIMATE stage so the LOD-ratio budget fails.
+They are not API-contract witnesses. Each falsifier violates one named
+budget: ``--skip-decimate`` the LOD-ratio band, ``--stray-vert`` mesh
+hygiene, ``--lift-z`` grounded zmin, ``--short-skids`` named skid
+supports, ``--float-handle`` handle-to-end joint-fit, ``--omit-slats``
+slat-to-post seat.
 
-No RNG. Construction is closed-form. DECIMATE COLLAPSE triangle counts
+Fixed seed 17 for slat-width jitter. DECIMATE COLLAPSE triangle counts
 are not byte-identical across Blender versions — the LOD gate is a
 ratio band, not an exact count.
 
@@ -303,6 +326,7 @@ 
Source

 import argparse
 import math
 import os
+import random
 import sys
 import tempfile
 import traceback
@@ -310,10 +334,8 @@ 
Source

 import bmesh
 import bpy
 from mathutils import Vector
+from mathutils.bvhtree import BVHTree
 
-# Showcase lives at repo-root/showcase/, not under examples/. The framing
-# helper is the repo's only shared import and lives next to the examples;
-# resolve the repo root so we do not move gallery_framing.py.
 _REPO = os.path.abspath(
     os.path.join(os.path.dirname(os.path.abspath(__file__)), os.pardir, os.pardir)
 )
@@ -321,18 +343,33 @@ 
Source

 sys.dont_write_bytecode = True
 import gallery_framing  # noqa: E402
 
-# Body size (meters), sitting on z=0. Side slats sit proud on ±Y; lid
-# slats sit proud on +Z. Iron handles sit proud on ±X. OUTER_SIZE is
-# fitted after locking geometry against the measured world bbox.
-BODY_SIZE = (1.20, 0.80, 0.72)
-SLAT_THICK = 0.028
-OUTER_SIZE = (1.352, 0.856, 0.748)
-BBOX_TOL = 0.01
-
-# Measured after locking geometry. DECIMATE COLLAPSE ratios diverge
-# across series — bands, not exact counts.
-BASE_TRIS_MIN = 580
-BASE_TRIS_MAX = 680
+# A chest-sized shipping crate, ~96 × 62 × 58 cm inner, sitting on
+# three skids. Outer AABB includes the proud L-straps and handles.
+INNER = (0.96, 0.62, 0.52)
+POST = 0.048
+SKID_H = 0.036
+SKID_W = 0.058
+SLAT_T = 0.016
+RAIL_H = 0.040
+TENON = 0.010
+IRON_T = 0.004
+IRON_WRAP = 0.072
+HANDLE_OUT = 0.038
+HANDLE_R = 0.007
+N_FLOOR = 6
+N_LID = 6
+N_LONG = 5
+N_END = 4
+SLAT_SEED = 17
+SLAT_JITTER = 0.045
+
+BBOX_TOL = 0.015
+OUTER_SIZE = (1.146, 0.726, 0.612)
+BODY_X, BODY_Y, BODY_Z = 1.056, 0.716, 0.576
+BODY_TOL = 0.05
+
+BASE_TRIS_MIN = 1200
+BASE_TRIS_MAX = 2800
 LOD1_RATIO_MIN = 0.32
 LOD1_RATIO_MAX = 0.62
 LOD2_RATIO_MIN = 0.10
@@ -342,21 +379,31 @@ 
Source

 MATERIAL_COUNT = 2
 UV_EPS = 1e-4
 UV_OVERLAP_MAX = 1e-5
-COLLIDER_TRIS_MAX = 48
+COLLIDER_TRIS_MAX = 220
 BAKE_RES = 256
 CAGE_EXTRUSION = 0.08
-METAL_FACES_MIN = 24
+METAL_FACES_MIN = 48
+WOOD_FACES_MIN = 200
+ZMIN_EPS = 1e-4
+DOUBLES_EPS = 1e-5
+AREA_EPS = 1e-10
+ZFIGHT_EPS = 1e-4
+ZFIGHT_COS = 0.999
+LIFT_Z = 0.05
+SKID_Z_MAX = 1e-3
+HANDLE_JOIN = 0.008
+SLAT_JOIN = 0.006
 
 WOOD_IDX = 0
 METAL_IDX = 1
 
 
 def eevee_engine_id():
-    return "BLENDER_EEVEE" if bpy.app.version >= (5, 0, 0) else "BLENDER_EEVEE_NEXT"
+    return "BLENDER_EEVEE_NEXT" if bpy.app.version >= (4, 2, 0) else "BLENDER_EEVEE"
 
 
 def fail(msg, code):
-    print(f"ERROR: {msg}", file=sys.stderr)
+    print(f"FAIL[{code}]: {msg}", file=sys.stderr)
     return code
 
 
@@ -366,18 +413,17 @@ 
Source

 
 
 def evaluated_triangle_count(obj):
-    # Duplicated from snippets/lod_chain.py / decimate_to_budget.py (not a package).
-    depsgraph = bpy.context.evaluated_depsgraph_get()
-    eval_obj = obj.evaluated_get(depsgraph)
-    eval_mesh = eval_obj.to_mesh()
+    deps = bpy.context.evaluated_depsgraph_get()
+    ev = obj.evaluated_get(deps)
+    mesh = ev.to_mesh()
     try:
-        eval_mesh.calc_loop_triangles()
-        return len(eval_mesh.loop_triangles)
+        mesh.calc_loop_triangles()
+        return len(mesh.loop_triangles)
     finally:
-        eval_obj.to_mesh_clear()
+        ev.to_mesh_clear()
 
 
-def add_cube(bm, loc, scale, mat_idx):
+def add_box(bm, loc, scale, mat_idx):
     geo = bmesh.ops.create_cube(bm, size=1.0)
     verts = geo["verts"]
     for v in verts:
@@ -390,6 +436,96 @@ 
Source

     return verts
 
 
+def _bridge_rings(bm, a, b, mat_idx):
+    segs = len(a)
+    for k in range(segs):
+        kn = (k + 1) % segs
+        face = bm.faces.new((a[k], a[kn], b[kn], b[k]))
+        face.material_index = mat_idx
+
+
+def loft_rings(bm, rings, mat_idx, cap_start=True, cap_end=True):
+    verts = [v for ring in rings for v in ring]
+    n = len(rings)
+    for i in range(n - 1):
+        _bridge_rings(bm, rings[i], rings[i + 1], mat_idx)
+    if cap_start and len(rings[0]) > 1:
+        ring = rings[0]
+        c = bm.verts.new(sum((v.co for v in ring), Vector((0, 0, 0))) / len(ring))
+        verts.append(c)
+        for k in range(len(ring)):
+            kn = (k + 1) % len(ring)
+            face = bm.faces.new((c, ring[kn], ring[k]))
+            face.material_index = mat_idx
+    if cap_end and len(rings[-1]) > 1:
+        ring = rings[-1]
+        c = bm.verts.new(sum((v.co for v in ring), Vector((0, 0, 0))) / len(ring))
+        verts.append(c)
+        for k in range(len(ring)):
+            kn = (k + 1) % len(ring)
+            face = bm.faces.new((c, ring[k], ring[kn]))
+            face.material_index = mat_idx
+    return verts
+
+
+def add_pipe_curve(bm, points, radius, segs, mat_idx):
+    rings = []
+    n = len(points)
+    for i, p in enumerate(points):
+        p = Vector(p)
+        if i < n - 1:
+            tangent = (Vector(points[i + 1]) - p).normalized()
+        else:
+            tangent = (p - Vector(points[i - 1])).normalized()
+        side = Vector((-tangent.y, tangent.x, 0.0))
+        if side.length < 1e-6:
+            side = Vector((1.0, 0.0, 0.0))
+        else:
+            side.normalize()
+        up = tangent.cross(side).normalized()
+        ring = []
+        for k in range(segs):
+            a = 2.0 * math.pi * k / segs
+            ring.append(
+                bm.verts.new(
+                    p + side * (radius * math.cos(a)) + up * (radius * math.sin(a))
+                )
+            )
+        rings.append(ring)
+    return loft_rings(bm, rings, mat_idx, cap_start=True, cap_end=True)
+
+
+def add_handle_bail(bm, x_in, x_out, y0, y1, z, radius, segs, mat_idx):
+    """U-bail with quarter-circle corners so the loft stays on the tube.
+
+    A four-point polyline puts a 90-degree tangent jump at each outer
+    corner; the ring there orients to the next span and the bar sits on
+    the mounting plate instead of entering it.
+    """
+    sign_x = 1.0 if x_out > x_in else -1.0
+    sign_y = 1.0 if y1 > y0 else -1.0
+    rad = min(0.014, abs(x_out - x_in) * 0.40, abs(y1 - y0) * 0.20)
+    pts = [
+        Vector((x_in, y0, z)),
+        Vector((x_out - sign_x * rad, y0, z)),
+    ]
+    c1 = Vector((x_out - sign_x * rad, y0 + sign_y * rad, z))
+    s1 = Vector((0.0, -sign_y * rad, 0.0))
+    e1 = Vector((sign_x * rad, 0.0, 0.0))
+    for i in range(1, 5):
+        a = (math.pi / 2.0) * i / 4.0
+        pts.append(c1 + s1 * math.cos(a) + e1 * math.sin(a))
+    pts.append(Vector((x_out, y1 - sign_y * rad, z)))
+    c2 = Vector((x_out - sign_x * rad, y1 - sign_y * rad, z))
+    s2 = Vector((sign_x * rad, 0.0, 0.0))
+    e2 = Vector((0.0, sign_y * rad, 0.0))
+    for i in range(1, 5):
+        a = (math.pi / 2.0) * i / 4.0
+        pts.append(c2 + s2 * math.cos(a) + e2 * math.sin(a))
+    pts.append(Vector((x_in, y1, z)))
+    add_pipe_curve(bm, pts, radius, segs, mat_idx)
+
+
 def pack_uvs(bm, margin=0.08):
     uv = bm.loops.layers.uv.new("UVMap")
     faces = list(bm.faces)
@@ -406,9 +542,7 @@ 
Source

         col = i % cols
         row = i // cols
         nrm = face.normal
-        ax = abs(nrm.x)
-        ay = abs(nrm.y)
-        az = abs(nrm.z)
+        ax, ay, az = abs(nrm.x), abs(nrm.y), abs(nrm.z)
         coords = []
         for loop in face.loops:
             co = loop.vert.co
@@ -433,109 +567,227 @@ 
Source

             )
 
 
-def build_crate_mesh(name, bevel_offset, bevel_segments):
-    sx, sy, sz = BODY_SIZE
-    slat_h = SLAT_THICK
+def _span_layout(count, span, rng):
+    """Uneven slat widths that still fill `span` with named gaps."""
+    raw = [1.0 + rng.uniform(-SLAT_JITTER, SLAT_JITTER) for _ in range(count)]
+    s = sum(raw)
+    gap = 0.010
+    usable = span - gap * (count + 1)
+    widths = [usable * r / s for r in raw]
+    pos = -span / 2.0 + gap
+    centres = []
+    for w in widths:
+        centres.append(pos + w / 2.0)
+        pos += w + gap
+    return centres, widths
+
+
+def build_crate_mesh(
+    name,
+    short_skids=False,
+    float_handle=False,
+    omit_slats=False,
+):
+    ix, iy, iz = INNER
+    hx = ix / 2.0 + POST / 2.0
+    hy = iy / 2.0 + POST / 2.0
+    post_h = iz + RAIL_H
+    top_z = SKID_H + post_h
+    rng = random.Random(SLAT_SEED)
     bm = bmesh.new()
+    wood_verts = []
     try:
-        body = add_cube(
-            bm, (0.0, 0.0, sz / 2.0), (sx, sy, sz), WOOD_IDX,
+        skid_z0 = 0.055 if short_skids else 0.0
+        if short_skids:
+            geo = bmesh.ops.create_cube(bm, size=1.0)
+            for v in geo["verts"]:
+                v.co.x *= 0.024
+                v.co.y *= 0.024
+                v.co.z *= 0.006
+                v.co.z += 0.003
+            for f in {f for v in geo["verts"] for f in v.link_faces}:
+                f.material_index = WOOD_IDX
+        # Skids sit under the posts, not inset at the inner wall line —
+        # that left a cave at the outer corner.
+        skid_ys = (-hy, 0.0, hy)
+        for sy in skid_ys:
+            wood_verts.extend(
+                add_box(
+                    bm,
+                    (0.0, sy, skid_z0 + SKID_H / 2.0),
+                    (ix + 2.0 * POST, SKID_W, SKID_H),
+                    WOOD_IDX,
+                )
+            )
+        for sxn in (-1.0, 1.0):
+            for syn in (-1.0, 1.0):
+                wood_verts.extend(
+                    add_box(
+                        bm,
+                        (sxn * hx, syn * hy, SKID_H - TENON + (post_h + TENON) / 2.0),
+                        (POST, POST, post_h + TENON),
+                        WOOD_IDX,
+                    )
+                )
+        # Top rails tenon into the posts — overlapping, not sharing a plane.
+        wood_verts.extend(
+            add_box(
+                bm, (0.0, hy, top_z - RAIL_H / 2.0),
+                (ix + 2.0 * TENON, POST, RAIL_H), WOOD_IDX,
+            )
         )
-        body_edges = list({e for v in body for e in v.link_edges})
-        if bevel_offset > 0.0:
-            bmesh.ops.bevel(
-                bm,
-                geom=body_edges,
-                offset=bevel_offset,
-                segments=bevel_segments,
-                profile=0.5,
-                affect="EDGES",
-                clamp_overlap=True,
+        wood_verts.extend(
+            add_box(
+                bm, (0.0, -hy, top_z - RAIL_H / 2.0),
+                (ix + 2.0 * TENON, POST, RAIL_H), WOOD_IDX,
             )
-
-        slat_w = 0.118
-        n_lid = 5
-        gap = (sy - 0.04 - n_lid * slat_w) / (n_lid + 1)
-        y0 = -sy / 2.0 + 0.02 + gap + slat_w / 2.0
-        for i in range(n_lid):
-            y = y0 + i * (slat_w + gap)
-            add_cube(
-                bm,
-                (0.0, y, sz + slat_h / 2.0),
-                (sx - 0.06, slat_w, slat_h),
-                WOOD_IDX,
+        )
+        wood_verts.extend(
+            add_box(
+                bm, (hx, 0.0, top_z - RAIL_H / 2.0),
+                (POST, iy + 2.0 * TENON, RAIL_H), WOOD_IDX,
+            )
+        )
+        wood_verts.extend(
+            add_box(
+                bm, (-hx, 0.0, top_z - RAIL_H / 2.0),
+                (POST, iy + 2.0 * TENON, RAIL_H), WOOD_IDX,
+            )
+        )
+        # Bottom sill tenons into the skid so the shared z=SKID_H plane
+        # is not two coplanar faces (z-fight).
+        sill_h = RAIL_H + TENON
+        sill_z = SKID_H - TENON + sill_h / 2.0
+        wood_verts.extend(
+            add_box(
+                bm, (0.0, hy, sill_z),
+                (ix + 2.0 * TENON, POST, sill_h), WOOD_IDX,
+            )
+        )
+        wood_verts.extend(
+            add_box(
+                bm, (0.0, -hy, sill_z),
+                (ix + 2.0 * TENON, POST, sill_h), WOOD_IDX,
             )
+        )
+        wood_verts.extend(
+            add_box(
+                bm, (hx, 0.0, sill_z),
+                (POST, iy + 2.0 * TENON, sill_h), WOOD_IDX,
+            )
+        )
+        wood_verts.extend(
+            add_box(
+                bm, (-hx, 0.0, sill_z),
+                (POST, iy + 2.0 * TENON, sill_h), WOOD_IDX,
+            )
+        )
 
-        n_side = 4
-        side_h = 0.095
-        z0 = 0.08 + side_h / 2.0
-        z_step = (sz - 0.16 - side_h) / (n_side - 1)
-        for sign in (-1.0, 1.0):
-            for i in range(n_side):
-                z = z0 + i * z_step
-                add_cube(
+        floor_c, floor_w = _span_layout(N_FLOOR, ix, rng)
+        for c, w in zip(floor_c, floor_w):
+            wood_verts.extend(
+                add_box(
                     bm,
-                    (0.0, sign * (sy / 2.0 + slat_h / 2.0), z),
-                    (sx - 0.10, slat_h, side_h),
+                    (c, 0.0, SKID_H + SLAT_T / 2.0),
+                    (w, iy + TENON, SLAT_T),
                     WOOD_IDX,
                 )
-                add_cube(
+            )
+        lid_c, lid_w = _span_layout(N_LID, ix + POST * 0.5, rng)
+        for c, w in zip(lid_c, lid_w):
+            wood_verts.extend(
+                add_box(
                     bm,
-                    (sign * (sx / 2.0 + slat_h / 2.0), 0.0, z),
-                    (slat_h, sy - 0.10, side_h),
+                    (c, 0.0, top_z + SLAT_T / 2.0),
+                    (w, iy + POST, SLAT_T),
                     WOOD_IDX,
                 )
+            )
 
-        plate = 0.18
-        thick = 0.028
-        hx = sx / 2.0 + slat_h
-        hy = sy / 2.0 + slat_h
-        hz = sz
-        for sxn in (-1.0, 1.0):
-            for syn in (-1.0, 1.0):
-                for szt in (0.0, 1.0):
-                    zc = thick / 2.0 if szt == 0.0 else hz - thick / 2.0
-                    add_cube(
+        if not omit_slats:
+            long_c, long_w = _span_layout(N_LONG, iz - 0.04, rng)
+            for sign in (-1.0, 1.0):
+                y = sign * (iy / 2.0 + POST - SLAT_T / 2.0 - 0.001)
+                for c, w in zip(long_c, long_w):
+                    wood_verts.extend(
+                        add_box(
+                            bm,
+                            (0.0, y, SKID_H + 0.02 + iz / 2.0 + c),
+                            (ix + TENON, SLAT_T, w),
+                            WOOD_IDX,
+                        )
+                    )
+        end_c, end_w = _span_layout(N_END, iz - 0.04, rng)
+        for sign in (-1.0, 1.0):
+            x = sign * (ix / 2.0 + POST - SLAT_T / 2.0 - 0.001)
+            for c, w in zip(end_c, end_w):
+                wood_verts.extend(
+                    add_box(
                         bm,
-                        (sxn * (hx - plate / 2.0), syn * (hy - plate / 2.0), zc),
-                        (plate, plate, thick),
-                        METAL_IDX,
+                        (x, 0.0, SKID_H + 0.02 + iz / 2.0 + c),
+                        (SLAT_T, iy + TENON, w),
+                        WOOD_IDX,
                     )
-                z_bar = hz / 2.0
-                add_cube(
+                )
+
+        if wood_verts:
+            edges = list({e for v in wood_verts for e in v.link_edges if v.is_valid})
+            if edges:
+                bmesh.ops.bevel(
                     bm,
-                    (sxn * (hx - thick / 2.0), syn * (hy - plate / 2.0), z_bar),
-                    (thick, plate, hz - 2.0 * thick),
+                    geom=edges,
+                    offset=0.002,
+                    segments=1,
+                    profile=0.5,
+                    affect="EDGES",
+                    clamp_overlap=True,
+                )
+
+        # L-straps: two plates meeting at a vertical edge, proud of the
+        # post. Not three overlapping cubes — those leave window holes.
+        wrap = IRON_WRAP
+        strap_z0 = 0.006
+        strap_h = top_z - strap_z0
+        zc = strap_z0 + strap_h / 2.0
+        for sxn in (-1.0, 1.0):
+            for syn in (-1.0, 1.0):
+                ox = sxn * (hx + POST / 2.0 + IRON_T / 2.0)
+                oy = syn * (hy + POST / 2.0 + IRON_T / 2.0)
+                add_box(
+                    bm,
+                    (ox, syn * (hy + POST / 2.0 - wrap / 2.0 + IRON_T / 2.0), zc),
+                    (IRON_T, wrap, strap_h),
                     METAL_IDX,
                 )
-                add_cube(
+                add_box(
                     bm,
-                    (sxn * (hx - plate / 2.0), syn * (hy - thick / 2.0), z_bar),
-                    (plate, thick, hz - 2.0 * thick),
+                    (sxn * (hx + POST / 2.0 - wrap / 2.0 + IRON_T / 2.0), oy, zc),
+                    (wrap - IRON_T, IRON_T, strap_h),
                     METAL_IDX,
                 )
 
-        handle_out = 0.038
+        hz = SKID_H + post_h * 0.52
         for sxn in (-1.0, 1.0):
-            hx_bar = sxn * (hx + handle_out)
-            add_cube(
-                bm,
-                (hx_bar, -0.12, sz * 0.48),
-                (0.020, 0.020, 0.12),
-                METAL_IDX,
-            )
-            add_cube(
-                bm,
-                (hx_bar, 0.12, sz * 0.48),
-                (0.020, 0.020, 0.12),
-                METAL_IDX,
+            x_plate = sxn * (ix / 2.0 + POST - SLAT_T / 2.0)
+            x_in = sxn * (ix / 2.0 + POST - SLAT_T - 0.008)
+            x_out = sxn * (ix / 2.0 + POST + HANDLE_OUT)
+            y0, y1 = -0.11, 0.11
+            add_box(
+                bm, (x_plate, y0, hz),
+                (SLAT_T + IRON_T * 2.0, 0.034, 0.044), METAL_IDX,
             )
-            add_cube(
-                bm,
-                (hx_bar, 0.0, sz * 0.54),
-                (0.020, 0.26, 0.020),
-                METAL_IDX,
+            add_box(
+                bm, (x_plate, y1, hz),
+                (SLAT_T + IRON_T * 2.0, 0.034, 0.044), METAL_IDX,
             )
+            if float_handle:
+                add_box(
+                    bm, (x_out, 0.0, hz), (0.020, 0.020, 0.020), METAL_IDX,
+                )
+            else:
+                add_handle_bail(
+                    bm, x_in, x_out, y0, y1, hz, HANDLE_R, 8, METAL_IDX,
+                )
 
         pack_uvs(bm)
         bmesh.ops.recalc_face_normals(bm, faces=list(bm.faces))
@@ -556,29 +808,44 @@ 
Source

     return obj
 
 
-def principled(name, color, metallic, roughness):
+def principled(name, color, metallic, roughness, noise_scale=0.0, wear=None):
     mat = bpy.data.materials.new(name)
     mat.use_nodes = True
-    bsdf = mat.node_tree.nodes["Principled BSDF"]
+    nt = mat.node_tree
+    bsdf = nt.nodes["Principled BSDF"]
     bsdf.inputs["Base Color"].default_value = color
     bsdf.inputs["Metallic"].default_value = metallic
     bsdf.inputs["Roughness"].default_value = roughness
+    if noise_scale > 0.0 and wear is not None:
+        tex = nt.nodes.new("ShaderNodeTexNoise")
+        tex.inputs["Scale"].default_value = noise_scale
+        tex.inputs["Detail"].default_value = 8.0
+        tex.inputs["Roughness"].default_value = 0.55
+        mix = nt.nodes.new("ShaderNodeMix")
+        mix.data_type = "RGBA"
+        mix.inputs["A"].default_value = color
+        mix.inputs["B"].default_value = wear
+        fac = mix.inputs.get("Factor") or mix.inputs.get("Fac")
+        nt.links.new(tex.outputs["Fac"], fac)
+        nt.links.new(mix.outputs["Result"], bsdf.inputs["Base Color"])
+        rmix = nt.nodes.new("ShaderNodeMix")
+        rmix.data_type = "FLOAT"
+        rmix.inputs["A"].default_value = roughness
+        rmix.inputs["B"].default_value = min(1.0, roughness + 0.18)
+        rfac = rmix.inputs.get("Factor") or rmix.inputs.get("Fac")
+        nt.links.new(tex.outputs["Fac"], rfac)
+        nt.links.new(rmix.outputs["Result"], bsdf.inputs["Roughness"])
     return mat
 
 
 def assign_slots(obj, wood, metal):
-    # Do not materials.clear() — that resets every polygon's material_index
-    # to 0 and the iron brackets vanish into wood.
     mats = obj.data.materials
-    if len(mats) == 0:
-        mats.append(wood)
-        mats.append(metal)
-        return
-    mats[0] = wood
-    if len(mats) == 1:
-        mats.append(metal)
-    else:
-        mats[1] = metal
+    wanted = (wood, metal)
+    for i, mat in enumerate(wanted):
+        if i < len(mats):
+            mats[i] = mat
+        else:
+            mats.append(mat)
 
 
 def world_bbox(obj):
@@ -614,6 +881,226 @@ 
Source

     return min(us), min(vs), max(us), max(vs), overlap, len(aabbs)
 
 
+def face_area(me, poly):
+    idxs = poly.vertices
+    if len(idxs) < 3:
+        return 0.0
+    v0 = me.vertices[idxs[0]].co
+    area = 0.0
+    for i in range(1, len(idxs) - 1):
+        vs = (me.vertices[idxs[i]].co, me.vertices[idxs[i + 1]].co)
+        area += (vs[0] - v0).cross(vs[1] - v0).length * 0.5
+    return area
+
+
+def hygiene_audit(me):
+    nv, ne, nf = len(me.vertices), len(me.edges), len(me.polygons)
+    ngons = sum(1 for p in me.polygons if len(p.vertices) > 4)
+    zero_area = sum(1 for p in me.polygons if face_area(me, p) <= AREA_EPS)
+    bm = bmesh.new()
+    try:
+        bm.from_mesh(me)
+        bm.verts.ensure_lookup_table()
+        bm.edges.ensure_lookup_table()
+        loose_v = sum(1 for v in bm.verts if len(v.link_edges) == 0)
+        loose_e = sum(1 for e in bm.edges if len(e.link_faces) == 0)
+        nonman = sum(1 for e in bm.edges if not e.is_manifold)
+        ret = bmesh.ops.find_doubles(bm, verts=list(bm.verts), dist=DOUBLES_EPS)
+        doubles = len(ret.get("targetmap") or {})
+    finally:
+        bm.free()
+    return {
+        "nv": nv, "ne": ne, "nf": nf, "ngons": ngons,
+        "loose_v": loose_v, "loose_e": loose_e, "nonman": nonman,
+        "zero_area": zero_area, "doubles": doubles, "euler": nv - ne + nf,
+    }
+
+
+def zfight_pairs(me):
+    data = [
+        (p.center.copy(), p.normal.copy(), frozenset(p.vertices))
+        for p in me.polygons
+    ]
+    eps2 = ZFIGHT_EPS * ZFIGHT_EPS
+    count = 0
+    for i in range(len(data)):
+        ci, ni, vi = data[i]
+        for j in range(i + 1, len(data)):
+            cj, nj, vj = data[j]
+            if (cj - ci).length_squared > eps2:
+                continue
+            if abs(ni.dot(nj)) <= ZFIGHT_COS:
+                continue
+            if vi & vj:
+                continue
+            count += 1
+    return count
+
+
+def shells(me):
+    neighbors = [[] for _ in range(len(me.vertices))]
+    for edge in me.edges:
+        a, b = edge.vertices
+        neighbors[a].append(b)
+        neighbors[b].append(a)
+    seen = [False] * len(me.vertices)
+    groups = []
+    for start in range(len(me.vertices)):
+        if seen[start]:
+            continue
+        seen[start] = True
+        stack = [start]
+        group = []
+        while stack:
+            current = stack.pop()
+            group.append(current)
+            for nxt in neighbors[current]:
+                if not seen[nxt]:
+                    seen[nxt] = True
+                    stack.append(nxt)
+        groups.append(group)
+    return groups
+
+
+def shell_aabb(me, group):
+    pts = [me.vertices[i].co for i in group]
+    return (
+        min(p.x for p in pts), min(p.y for p in pts), min(p.z for p in pts),
+        max(p.x for p in pts), max(p.y for p in pts), max(p.z for p in pts),
+    )
+
+
+def mat_of(me, group):
+    member = set(group)
+    for p in me.polygons:
+        if all(i in member for i in p.vertices):
+            return p.material_index
+    return None
+
+
+def support_audit(me):
+    groups = shells(me)
+    skids = []
+    for g in groups:
+        if mat_of(me, g) != WOOD_IDX:
+            continue
+        a = shell_aabb(me, g)
+        dx, dy, dz = a[3] - a[0], a[4] - a[1], a[5] - a[2]
+        if a[2] < 0.01 and dx > 0.6 and dy < 0.12 and dz < 0.08:
+            skids.append(a)
+    skid_z = min((a[2] for a in skids), default=99.0)
+    return {"skids": len(skids), "skid_z": skid_z}
+
+
+def body_audit(me):
+    wood_ids = set()
+    for p in me.polygons:
+        if p.material_index == WOOD_IDX:
+            wood_ids.update(p.vertices)
+    pts = [
+        me.vertices[i].co for i in wood_ids
+        if me.vertices[i].co.z > SKID_H + 0.01
+    ]
+    if not pts:
+        return {"dx": 0.0, "dy": 0.0, "dz": 0.0}
+    xs, ys, zs = [p.x for p in pts], [p.y for p in pts], [p.z for p in pts]
+    return {
+        "dx": max(xs) - min(xs),
+        "dy": max(ys) - min(ys),
+        "dz": max(zs) - min(zs),
+    }
+
+
+def _bvh_gap(me, hosts, guests):
+    if not hosts or not guests:
+        return 99.0
+    bm_h = bmesh.new()
+    try:
+        bm_h.from_mesh(me)
+        keep = set()
+        for g in hosts:
+            keep.update(g)
+        drop = [
+            f for f in bm_h.faces
+            if not all(v.index in keep for v in f.verts)
+        ]
+        if drop:
+            bmesh.ops.delete(bm_h, geom=drop, context="FACES")
+        if not bm_h.faces:
+            return 99.0
+        tree = BVHTree.FromBMesh(bm_h)
+        worst = 0.0
+        for g in guests:
+            bm_g = bmesh.new()
+            try:
+                bm_g.from_mesh(me)
+                member = set(g)
+                drop_g = [
+                    f for f in bm_g.faces
+                    if not all(v.index in member for v in f.verts)
+                ]
+                if drop_g:
+                    bmesh.ops.delete(bm_g, geom=drop_g, context="FACES")
+                if not bm_g.faces:
+                    worst = max(worst, 99.0)
+                    continue
+                tree_g = BVHTree.FromBMesh(bm_g)
+                if tree.overlap(tree_g):
+                    continue
+                best = 99.0
+                for i in g:
+                    hit = tree.find_nearest(me.vertices[i].co)
+                    if hit[0] is None:
+                        continue
+                    best = min(best, hit[3])
+                if best > worst:
+                    worst = best
+            finally:
+                bm_g.free()
+        return worst
+    finally:
+        bm_h.free()
+
+
+def handle_join(me):
+    groups = shells(me)
+    ends, handles = [], []
+    for g in groups:
+        a = shell_aabb(me, g)
+        dx, dy, dz = a[3] - a[0], a[4] - a[1], a[5] - a[2]
+        if mat_of(me, g) == WOOD_IDX and dx < 0.04 and dy > 0.40 and 0.03 < dz < 0.18:
+            ends.append(g)
+        elif mat_of(me, g) == METAL_IDX and dz < 0.12 and max(dx, dy) > 0.15:
+            handles.append(g)
+    return _bvh_gap(me, ends, handles)
+
+
+def slat_join(me):
+    groups = shells(me)
+    posts, slats = [], []
+    for g in groups:
+        if mat_of(me, g) != WOOD_IDX:
+            continue
+        a = shell_aabb(me, g)
+        dx, dy, dz = a[3] - a[0], a[4] - a[1], a[5] - a[2]
+        if dz > 0.30 and dx < 0.08 and dy < 0.08:
+            posts.append(g)
+        elif 0.04 < dz < 0.16 and dx > 0.40 and dy < 0.030:
+            slats.append(g)
+    return _bvh_gap(me, posts, slats)
+
+
+def add_stray_vert(me):
+    bm = bmesh.new()
+    try:
+        bm.from_mesh(me)
+        bm.verts.new((0.0, 0.0, 0.40))
+        bm.to_mesh(me)
+        me.update()
+    finally:
+        bm.free()
+
+
 def make_lod(obj, name, ratio, skip_decimate):
     mesh = obj.data.copy()
     lod = bpy.data.objects.new(name, mesh)
@@ -627,7 +1114,6 @@ 
Source

 
 
 def convex_hull_collider(obj, name):
-    # Duplicated from snippets/convex_hull_collider.py (not a package).
     mesh = bpy.data.meshes.new(name)
     bm = bmesh.new()
     try:
@@ -649,13 +1135,12 @@ 
Source

     return collider
 
 
-def setup_bake_image(obj, wood, size=BAKE_RES):
-    # Adapted from snippets/setup_bake_target_image.py — do not replace slots.
+def setup_bake_image(obj, target_mat, size=BAKE_RES):
     if not obj.data.uv_layers:
         return None, None
     img = bpy.data.images.new("CrateNrm", size, size, alpha=True, float_buffer=False)
     img.colorspace_settings.name = "Non-Color"
-    nodes = wood.node_tree.nodes
+    nodes = target_mat.node_tree.nodes
     tex = nodes.new("ShaderNodeTexImage")
     tex.image = img
     nodes.active = tex
@@ -665,7 +1150,6 @@ 
Source

 
 
 def bake_normal(high, low):
-    # Duplicated from snippets/bake_normal_high_to_low.py (not a package).
     scene = bpy.context.scene
     scene.render.engine = "CYCLES"
     scene.cycles.device = "CPU"
@@ -690,7 +1174,6 @@ 
Source

 
 
 def export_unity(path, objects):
-    # Duplicated from snippets/export_preset_unity.py (not a package).
     for ob in bpy.context.view_layer.objects:
         ob.select_set(False)
     for ob in objects:
@@ -706,14 +1189,39 @@ 
Source

     )
 
 
-def check(skip_decimate):
+def check(
+    skip_decimate,
+    lift_z=False,
+    stray_vert=False,
+    short_skids=False,
+    float_handle=False,
+    omit_slats=False,
+):
     bpy.ops.wm.read_factory_settings(use_empty=True)
-    low = build_crate_mesh("CrateLow", bevel_offset=0.028, bevel_segments=2)
-    high = build_crate_mesh("CrateHigh", bevel_offset=0.028, bevel_segments=4)
-    wood = principled("CrateWood", (0.48, 0.22, 0.07, 1.0), 0.0, 0.50)
-    metal = principled("CrateMetal", (0.14, 0.13, 0.12, 1.0), 0.86, 0.36)
+    flags = dict(
+        short_skids=short_skids,
+        float_handle=float_handle,
+        omit_slats=omit_slats,
+    )
+    low = build_crate_mesh("CrateLow", **flags)
+    high = build_crate_mesh("CrateHigh", **flags)
+    wood = principled(
+        "CrateWood", (0.48, 0.22, 0.07, 1.0), 0.0, 0.50,
+        noise_scale=7.0, wear=(0.28, 0.14, 0.05, 1.0),
+    )
+    metal = principled(
+        "CrateMetal", (0.18, 0.17, 0.16, 1.0), 0.86, 0.36,
+        noise_scale=5.0, wear=(0.10, 0.09, 0.08, 1.0),
+    )
     assign_slots(low, wood, metal)
     assign_slots(high, wood, metal)
+    if stray_vert:
+        add_stray_vert(low.data)
+    if lift_z:
+        for v in low.data.vertices:
+            v.co.z += LIFT_Z
+        low.data.update()
+        bpy.context.view_layer.update()
 
     if low.data is None or len(low.data.polygons) < 6:
         return fail("crate mesh did not build", 3), None, None, None, None, None
@@ -745,7 +1253,9 @@ 
Source

     r1 = lod1_tris / base_tris if base_tris else 0.0
     r2 = lod2_tris / base_tris if base_tris else 0.0
 
-    collider = convex_hull_collider(low, "CrateCollider")
+    collider_src = build_crate_mesh("CrateColSrc", **flags)
+    collider = convex_hull_collider(collider_src, "CrateCollider")
+    bpy.data.objects.remove(collider_src, do_unlink=True)
     col_tris = triangle_count(collider.data)
 
     export_path = os.path.join(
@@ -757,9 +1267,14 @@ 
Source

     export_unity(export_path, [low, collider])
     export_size = os.path.getsize(export_path) if os.path.isfile(export_path) else 0
 
-    print(
-        f"blender={tuple(bpy.app.version)} skip_decimate={skip_decimate}"
-    )
+    hyg = hygiene_audit(low.data)
+    zf = zfight_pairs(low.data)
+    sup = support_audit(low.data)
+    body = body_audit(low.data)
+    hj = handle_join(low.data)
+    sj = slat_join(low.data)
+
+    print(f"blender={tuple(bpy.app.version)} skip_decimate={skip_decimate}")
     print(
         f"measured base_tris={base_tris} lod1_tris={lod1_tris} "
         f"lod2_tris={lod2_tris} r1={r1:.4f} r2={r2:.4f}"
@@ -776,6 +1291,16 @@ 
Source

         f"measured collider_tris={col_tris} bake={bake_result} "
         f"bake_has_data={img.has_data} export_bytes={export_size}"
     )
+    print(
+        f"measured hygiene loose_v={hyg['loose_v']} loose_e={hyg['loose_e']} "
+        f"nonman={hyg['nonman']} zero_area={hyg['zero_area']} "
+        f"doubles={hyg['doubles']} ngons={hyg['ngons']} zfight={zf}"
+    )
+    print(
+        f"measured supports skids={sup['skids']} skid_z={sup['skid_z']:.5f} "
+        f"body=({body['dx']:.4f},{body['dy']:.4f},{body['dz']:.4f}) "
+        f"handle_join={hj:.5f} slat_join={sj:.5f}"
+    )
 
     if not (BASE_TRIS_MIN <= base_tris <= BASE_TRIS_MAX):
         return fail(
@@ -792,6 +1317,11 @@ 
Source

             f"metal faces {idx_counts.get(METAL_IDX, 0)} < {METAL_FACES_MIN}",
             5,
         ), None, None, None, None, None
+    if idx_counts.get(WOOD_IDX, 0) < WOOD_FACES_MIN:
+        return fail(
+            f"wood faces {idx_counts.get(WOOD_IDX, 0)} < {WOOD_FACES_MIN}",
+            5,
+        ), None, None, None, None, None
     if u0 < -UV_EPS or v0 < -UV_EPS or u1 > 1.0 + UV_EPS or v1 > 1.0 + UV_EPS:
         return fail(
             f"UVs outside 0..1: ({u0:.4f},{v0:.4f})-({u1:.4f},{v1:.4f})",
@@ -835,6 +1365,44 @@ 
Source

         ), None, None, None, None, None
     if export_size <= 0:
         return fail("export file missing or empty", 13), None, None, None, None, None
+    if (
+        hyg["loose_v"] or hyg["loose_e"] or hyg["nonman"]
+        or hyg["zero_area"] or hyg["doubles"] or hyg["ngons"] or zf
+    ):
+        return fail(
+            f"hygiene loose_v={hyg['loose_v']} loose_e={hyg['loose_e']} "
+            f"nonman={hyg['nonman']} zero_area={hyg['zero_area']} "
+            f"doubles={hyg['doubles']} ngons={hyg['ngons']} zfight={zf}",
+            15,
+        ), None, None, None, None, None
+    if abs(bb[2]) > ZMIN_EPS:
+        return fail(
+            f"zmin {bb[2]:.6f} not within {ZMIN_EPS} of 0 "
+            "(--lift-z is the designed fail)",
+            16,
+        ), None, None, None, None, None
+    if sup["skids"] < 3 or sup["skid_z"] > SKID_Z_MAX:
+        return fail(
+            f"skid supports {sup['skids']} skid_z={sup['skid_z']:.5f} "
+            "(--short-skids is the designed fail)",
+            16,
+        ), None, None, None, None, None
+    if hj > HANDLE_JOIN:
+        return fail(
+            f"handle-end gap {hj:.5f} > {HANDLE_JOIN} "
+            "(--float-handle is the designed fail)",
+            17,
+        ), None, None, None, None, None
+    if sj > SLAT_JOIN:
+        return fail(
+            f"slat-post gap {sj:.5f} > {SLAT_JOIN} "
+            "(--omit-slats is the designed fail)",
+            18,
+        ), None, None, None, None, None
+    if abs(body["dx"] - BODY_X) > BODY_TOL:
+        return fail(f"body dx {body['dx']:.4f} off {BODY_X}", 19), None, None, None, None, None
+    if abs(body["dy"] - BODY_Y) > BODY_TOL:
+        return fail(f"body dy {body['dy']:.4f} off {BODY_Y}", 19), None, None, None, None, None
     return 0, low, high, wood, tex, collider
 
 
@@ -902,10 +1470,10 @@ 
Source

     cam_data = bpy.data.cameras.new("Cam")
     cam_data.lens = 50.0
     cam = bpy.data.objects.new("Cam", cam_data)
-    cam.location = (2.25, -2.75, 1.38)
+    cam.location = (1.96, -2.44, 1.32)
     scene.collection.objects.link(cam)
     aim = bpy.data.objects.new("Aim", None)
-    aim.location = (0.0, 0.0, 0.40)
+    aim.location = (0.0, 0.0, 0.30)
     scene.collection.objects.link(aim)
     con = cam.constraints.new("TRACK_TO")
     con.target = aim
@@ -934,7 +1502,6 @@ 
Source

 
     fcode = gallery_framing.check_framing(
         scene, cam, hero=[low], elements=[low], stage=[floor, wall],
-        strategy="projection",
     )
     if fcode:
         return fcode
@@ -949,14 +1516,22 @@ 
Source

     p = argparse.ArgumentParser()
     p.add_argument("--output", default=None)
     p.add_argument("--engine", default="eevee", choices=("eevee", "cycles"))
-    p.add_argument(
-        "--skip-decimate",
-        action="store_true",
-        help="falsification: skip the LOD DECIMATE stage",
-    )
+    p.add_argument("--skip-decimate", action="store_true")
+    p.add_argument("--lift-z", action="store_true")
+    p.add_argument("--stray-vert", action="store_true")
+    p.add_argument("--short-skids", action="store_true")
+    p.add_argument("--float-handle", action="store_true")
+    p.add_argument("--omit-slats", action="store_true")
     args = p.parse_args(argv)
 
-    code, low, _high, wood, tex, _col = check(args.skip_decimate)
+    code, low, _high, wood, tex, _col = check(
+        args.skip_decimate,
+        lift_z=args.lift_z,
+        stray_vert=args.stray_vert,
+        short_skids=args.short_skids,
+        float_handle=args.float_handle,
+        omit_slats=args.omit_slats,
+    )
     if code:
         return code
     if args.output:
diff --git a/showcase/gallery.json b/showcase/gallery.json
index 9a24950..93d22b7 100644
--- a/showcase/gallery.json
+++ b/showcase/gallery.json
@@ -9,7 +9,7 @@
       "name": "shipping-crate",
       "dir": "showcase/shipping-crate",
       "teaches": "A procedural shipping crate through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
-      "witnessesFix": "Recomputed: 624 tris, two materials with 132 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.352×0.856×0.748 m, LOD ratios in band (5.2 COLLAPSE more aggressive), convex collider 36 tris, non-empty glTF. --skip-decimate exits 9 on the LOD1 ratio budget.",
+      "witnessesFix": "Recomputed: 2508 tris, two materials with 1170 wood and 280 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.146×0.726×0.612 m, grounded zmin, 3 skids, handle-end and slat-post join 0, mesh hygiene all zero, LOD ratios in band (5.2 COLLAPSE leaner on LOD2), convex collider 76 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-skids 16; --float-handle 17; --omit-slats 18.",
       "hero": "docs/gallery/assets/shipping-crate-hero.webp",
       "preview": "showcase/shipping-crate/preview.webp",
       "tags": [
@@ -285,7 +285,7 @@
       "name": "iron-cauldron",
       "dir": "showcase/iron-cauldron",
       "teaches": "A procedural hanging iron cauldron with a bulged open pot, bail, and timber tripod through UVs, bake, LOD, collider, and Unity glTF, asserting recomputed budgets rather than an API contract.",
-      "witnessesFix": "Recomputed: 3388 tris, two materials with 450 wood and 1198 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 1.013×0.986×0.827 m, pot–leg clearance 0.051 m, LOD ratios in band (5.2 COLLAPSE 8 tris leaner on LOD2), convex collider 98 tris, non-empty glTF. --skip-decimate exits 9 on the LOD1 ratio budget.",
+      "witnessesFix": "Recomputed: 3664 tris, two materials with 224 wood and 1768 metal faces, UVs in 0..1 with zero AABB overlap, outer AABB 0.987×0.961×0.860 m, pot–leg clearance 0.046 m, 3 coaxial ferrules at zmin 0, ferrule bite −0.00185 m, hook-bail join 0, mesh hygiene all zero, LOD ratios in band, convex collider 250 tris, non-empty glTF. --skip-decimate exits 9; --stray-vert 15; --lift-z/--short-legs 16; --float-hook 17; --pipe-ferrule 18.",
       "hero": "docs/gallery/assets/iron-cauldron-hero.webp",
       "preview": "showcase/iron-cauldron/preview.webp",
       "tags": [
diff --git a/showcase/shipping-crate/README.md b/showcase/shipping-crate/README.md
index e8506e5..5fc61ea 100644
--- a/showcase/shipping-crate/README.md
+++ b/showcase/shipping-crate/README.md
@@ -1,9 +1,14 @@
 # Shipping crate
 
-A showcase piece, not an example. Procedural crate (beveled body, arrayed
-slats, iron corner brackets and end handles, two materials) then the shipped
-pipeline: unique-cell UVs, Cycles high-to-low normal bake, LOD chain, convex
-collider, Unity glTF export.
+A showcase piece, not an example. Procedural crate (skids under the
+posts, corner posts with tenoned slats and seeded width jitter, bottom
+sills, L-straps, filleted iron bail handles through mounting plates)
+then the shipped pipeline: unique-cell UVs, Cycles high-to-low normal
+bake, LOD chain, convex collider, Unity glTF export.
+
+Skids sit under the posts so the outer corner is a mortise, not a cave.
+Handle bails use quarter-circle corners so a 90-degree loft cannot sit
+the bar on the plate.
 
 It asserts **budget conformance** of the generated result. It does not
 witness an API contract. "It rendered without error" is not a check.
@@ -21,37 +26,83 @@ materials, UVs, evaluated LOD, collider, or export file.
 
 | Axis | Declared | Measured (4.5.11 / 5.1.2 / 5.2.1) |
 | --- | --- | --- |
-| Base triangles | 580–680 | 624 / 624 / 624 |
-| LOD1 ratio | 0.32–0.62 of base | 0.5000 / 0.5000 / 0.4455 |
-| LOD2 ratio | 0.10–0.35 of base | 0.2179 / 0.2179 / 0.1571 |
-| Materials | exactly 2 distinct, ≥24 metal faces | 2 slots, 180 wood, 132 metal |
+| Base triangles | 1200–2800 | 2508 / 2508 / 2508 |
+| LOD1 ratio | 0.32–0.62 of base | 0.5000 / 0.5000 / 0.5000 |
+| LOD2 ratio | 0.10–0.35 of base | 0.2193 / 0.2193 / 0.2057 |
+| Materials | exactly 2 distinct; ≥200 wood, ≥48 metal faces | 2 slots; 1170 / 280 |
 | UVs | in `0..1`, AABB overlap ≤ 1e-5 | in range, overlap 0 |
-| Outer AABB | (1.352, 0.856, 0.748) m ± 0.01 | (1.3520, 0.8560, 0.7480), zmin 0 |
-| Collider tris | ≤ 48 | 36 |
-| Export | written, size > 0 | 50148 / 50148 / 50140 bytes |
+| Outer AABB | (1.146, 0.726, 0.612) m ± 0.015 | (1.1460, 0.7260, 0.6120), zmin 0 |
+| Collider tris | ≤ 220 | 76 |
+| Export | written, size > 0 | 197408 / 197408 / 197392 bytes |
+
+Base triangles rose from **624 to 2508** in the quality pass: the old
+beveled cube with glued-on slats became a post-and-slat crate with
+tenons, sills, L-straps, and pipe handles.
 
 DECIMATE COLLAPSE triangle counts are **not** identical across series —
-5.2.1 is more aggressive. The gate is a ratio band, not an exact count.
+5.2.1 is leaner on LOD2. The gate is a ratio band, not an exact count.
 Bake pixels are stochastic; the gate is `has_data` plus operator
-`FINISHED`, not byte-identity. Construction uses no RNG.
+`FINISHED`, not byte-identity. Slat-width jitter uses fixed seed 17.
+Export byte counts differ by 16 B on 5.2.1 (glTF serializer), not a
+gated axis.
+
+### Hygiene
+
+Recomputed from the generated mesh, not asserted about the script.
+
+| Axis | Declared | Measured (all three) |
+| --- | --- | --- |
+| Non-manifold edges | 0 | 0 |
+| Loose verts / edges | 0 / 0 | 0 / 0 |
+| Doubles merged at 1e-5 | 0 | 0 |
+| Zero-area faces | 0 | 0 |
+| N-gons | 0 | 0 |
+| Coplanar disjoint face pairs | 0 | 0 |
+| Grounded: `zmin` | within 1e-4 of 0 | 0.0000 |
+| Named supports: 3 skids | each `zmin` ≤ 1e-3 | 3, skid_z 0.00000 |
+| Body plan | 1.056 × 0.716 m ± 0.05 | 1.0560 × 0.7160 |
 
-`--skip-decimate` skips the LOD DECIMATE stage so LOD1 ratio is 1.0 and
-exit 9 fires. That is the named budget the falsifier violates.
+### Joint fit and seat
+
+| Axis | Declared | Measured (all three) |
+| --- | --- | --- |
+| Handle-end BVH gap | ≤ 0.008 m | 0.00000 |
+| Slat-post BVH gap | ≤ 0.006 m | 0.00000 |
+
+### Falsifiers
+
+Each violates one named budget. All seven were run on 4.5.11, 5.1.2 and
+5.2.1 and returned the same code on each.
+
+| Flag | Budget violated | Exit |
+| --- | --- | --- |
+| `--skip-decimate` | LOD1 ratio band | 9 |
+| `--stray-vert` | loose vertex count is 0 | 15 |
+| `--lift-z` | bounding box `zmin` is 0 | 16 |
+| `--short-skids` | named skid supports at Z=0 | 16 |
+| `--float-handle` | handle-end gap | 17 |
+| `--omit-slats` | slat-post seat | 18 |
 
 ## Run
 
 ```bash
 blender --background --python shipping_crate.py --
 blender --background --python shipping_crate.py -- --skip-decimate
+blender --background --python shipping_crate.py -- --stray-vert
+blender --background --python shipping_crate.py -- --lift-z
+blender --background --python shipping_crate.py -- --short-skids
+blender --background --python shipping_crate.py -- --float-handle
+blender --background --python shipping_crate.py -- --omit-slats
 blender --background --python shipping_crate.py -- --output crate.png
 ```
 
-Smoke does not pass `--output` or `--skip-decimate`.
+Smoke passes no flags.
 
 ## Exit codes
 
 File-local. `9` is a valid check code. `10` is reserved for
-`gallery_framing.check_framing` on the `--output` path.
+`gallery_framing.check_framing` on the `--output` path. `15`–`19` are the
+hygiene and joint-fit family.
 
 | Code | Meaning |
 | --- | --- |
@@ -60,7 +111,7 @@ File-local. `9` is a valid check code. `10` is reserved for
 | 2 | argparse / usage |
 | 3 | Mesh did not build / no UV layer |
 | 4 | Base triangle count outside range |
-| 5 | Material count ≠ 2 distinct slots, or metal faces missing |
+| 5 | Material count ≠ 2 distinct slots, or a face-count floor missed |
 | 6 | UVs outside 0..1 |
 | 7 | UV AABB overlap above tolerance |
 | 8 | World AABB off declared outer size |
@@ -70,3 +121,8 @@ File-local. `9` is a valid check code. `10` is reserved for
 | 12 | Bake did not finish or image has no data |
 | 13 | Export file missing or empty |
 | 14 | `--output` produced no file |
+| 15 | Mesh hygiene: loose, non-manifold, zero-area, doubles, n-gons, z-fight |
+| 16 | Not grounded: bounding box `zmin` off 0, or a named skid floats |
+| 17 | Joint fit: handle-end gap |
+| 18 | Seat: slat-post gap |
+| 19 | Body plan off the stated real-world size |
diff --git a/showcase/shipping-crate/preview.webp b/showcase/shipping-crate/preview.webp
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diff --git a/showcase/shipping-crate/shipping_crate.py b/showcase/shipping-crate/shipping_crate.py
index b89fabf..89dc0bf 100644
--- a/showcase/shipping-crate/shipping_crate.py
+++ b/showcase/shipping-crate/shipping_crate.py
@@ -1,14 +1,23 @@
 """Game-ready shipping crate — a showcase piece, not an example.
 
-Asserts budget conformance of a procedural crate after composing shipped
-pipeline pieces: bmesh construction, UVs, two materials, high-to-low
-normal bake, LOD chain, convex collider, Unity glTF export.
+Asserts budget conformance of a procedural crate (skids, corner posts,
+tenoned slats with seeded width jitter, L-straps, iron bail handles)
+after composing shipped pipeline pieces: bmesh construction, UVs, two
+materials, high-to-low normal bake, LOD chain, convex collider, Unity
+glTF export.
+
+The old piece was a solid beveled cube with identical slats glued on
+and three overlapping cubes per corner that left window-holes through
+the iron.
 
 Budgets are declared below and recomputed from the generated result.
-They are not API-contract witnesses. ``--skip-decimate`` skips the LOD
-DECIMATE stage so the LOD-ratio budget fails.
+They are not API-contract witnesses. Each falsifier violates one named
+budget: ``--skip-decimate`` the LOD-ratio band, ``--stray-vert`` mesh
+hygiene, ``--lift-z`` grounded zmin, ``--short-skids`` named skid
+supports, ``--float-handle`` handle-to-end joint-fit, ``--omit-slats``
+slat-to-post seat.
 
-No RNG. Construction is closed-form. DECIMATE COLLAPSE triangle counts
+Fixed seed 17 for slat-width jitter. DECIMATE COLLAPSE triangle counts
 are not byte-identical across Blender versions — the LOD gate is a
 ratio band, not an exact count.
 
@@ -19,6 +28,7 @@
 import argparse
 import math
 import os
+import random
 import sys
 import tempfile
 import traceback
@@ -26,10 +36,8 @@
 import bmesh
 import bpy
 from mathutils import Vector
+from mathutils.bvhtree import BVHTree
 
-# Showcase lives at repo-root/showcase/, not under examples/. The framing
-# helper is the repo's only shared import and lives next to the examples;
-# resolve the repo root so we do not move gallery_framing.py.
 _REPO = os.path.abspath(
     os.path.join(os.path.dirname(os.path.abspath(__file__)), os.pardir, os.pardir)
 )
@@ -37,18 +45,33 @@
 sys.dont_write_bytecode = True
 import gallery_framing  # noqa: E402
 
-# Body size (meters), sitting on z=0. Side slats sit proud on ±Y; lid
-# slats sit proud on +Z. Iron handles sit proud on ±X. OUTER_SIZE is
-# fitted after locking geometry against the measured world bbox.
-BODY_SIZE = (1.20, 0.80, 0.72)
-SLAT_THICK = 0.028
-OUTER_SIZE = (1.352, 0.856, 0.748)
-BBOX_TOL = 0.01
-
-# Measured after locking geometry. DECIMATE COLLAPSE ratios diverge
-# across series — bands, not exact counts.
-BASE_TRIS_MIN = 580
-BASE_TRIS_MAX = 680
+# A chest-sized shipping crate, ~96 × 62 × 58 cm inner, sitting on
+# three skids. Outer AABB includes the proud L-straps and handles.
+INNER = (0.96, 0.62, 0.52)
+POST = 0.048
+SKID_H = 0.036
+SKID_W = 0.058
+SLAT_T = 0.016
+RAIL_H = 0.040
+TENON = 0.010
+IRON_T = 0.004
+IRON_WRAP = 0.072
+HANDLE_OUT = 0.038
+HANDLE_R = 0.007
+N_FLOOR = 6
+N_LID = 6
+N_LONG = 5
+N_END = 4
+SLAT_SEED = 17
+SLAT_JITTER = 0.045
+
+BBOX_TOL = 0.015
+OUTER_SIZE = (1.146, 0.726, 0.612)
+BODY_X, BODY_Y, BODY_Z = 1.056, 0.716, 0.576
+BODY_TOL = 0.05
+
+BASE_TRIS_MIN = 1200
+BASE_TRIS_MAX = 2800
 LOD1_RATIO_MIN = 0.32
 LOD1_RATIO_MAX = 0.62
 LOD2_RATIO_MIN = 0.10
@@ -58,21 +81,31 @@
 MATERIAL_COUNT = 2
 UV_EPS = 1e-4
 UV_OVERLAP_MAX = 1e-5
-COLLIDER_TRIS_MAX = 48
+COLLIDER_TRIS_MAX = 220
 BAKE_RES = 256
 CAGE_EXTRUSION = 0.08
-METAL_FACES_MIN = 24
+METAL_FACES_MIN = 48
+WOOD_FACES_MIN = 200
+ZMIN_EPS = 1e-4
+DOUBLES_EPS = 1e-5
+AREA_EPS = 1e-10
+ZFIGHT_EPS = 1e-4
+ZFIGHT_COS = 0.999
+LIFT_Z = 0.05
+SKID_Z_MAX = 1e-3
+HANDLE_JOIN = 0.008
+SLAT_JOIN = 0.006
 
 WOOD_IDX = 0
 METAL_IDX = 1
 
 
 def eevee_engine_id():
-    return "BLENDER_EEVEE" if bpy.app.version >= (5, 0, 0) else "BLENDER_EEVEE_NEXT"
+    return "BLENDER_EEVEE_NEXT" if bpy.app.version >= (4, 2, 0) else "BLENDER_EEVEE"
 
 
 def fail(msg, code):
-    print(f"ERROR: {msg}", file=sys.stderr)
+    print(f"FAIL[{code}]: {msg}", file=sys.stderr)
     return code
 
 
@@ -82,18 +115,17 @@ def triangle_count(mesh):
 
 
 def evaluated_triangle_count(obj):
-    # Duplicated from snippets/lod_chain.py / decimate_to_budget.py (not a package).
-    depsgraph = bpy.context.evaluated_depsgraph_get()
-    eval_obj = obj.evaluated_get(depsgraph)
-    eval_mesh = eval_obj.to_mesh()
+    deps = bpy.context.evaluated_depsgraph_get()
+    ev = obj.evaluated_get(deps)
+    mesh = ev.to_mesh()
     try:
-        eval_mesh.calc_loop_triangles()
-        return len(eval_mesh.loop_triangles)
+        mesh.calc_loop_triangles()
+        return len(mesh.loop_triangles)
     finally:
-        eval_obj.to_mesh_clear()
+        ev.to_mesh_clear()
 
 
-def add_cube(bm, loc, scale, mat_idx):
+def add_box(bm, loc, scale, mat_idx):
     geo = bmesh.ops.create_cube(bm, size=1.0)
     verts = geo["verts"]
     for v in verts:
@@ -106,6 +138,96 @@ def add_cube(bm, loc, scale, mat_idx):
     return verts
 
 
+def _bridge_rings(bm, a, b, mat_idx):
+    segs = len(a)
+    for k in range(segs):
+        kn = (k + 1) % segs
+        face = bm.faces.new((a[k], a[kn], b[kn], b[k]))
+        face.material_index = mat_idx
+
+
+def loft_rings(bm, rings, mat_idx, cap_start=True, cap_end=True):
+    verts = [v for ring in rings for v in ring]
+    n = len(rings)
+    for i in range(n - 1):
+        _bridge_rings(bm, rings[i], rings[i + 1], mat_idx)
+    if cap_start and len(rings[0]) > 1:
+        ring = rings[0]
+        c = bm.verts.new(sum((v.co for v in ring), Vector((0, 0, 0))) / len(ring))
+        verts.append(c)
+        for k in range(len(ring)):
+            kn = (k + 1) % len(ring)
+            face = bm.faces.new((c, ring[kn], ring[k]))
+            face.material_index = mat_idx
+    if cap_end and len(rings[-1]) > 1:
+        ring = rings[-1]
+        c = bm.verts.new(sum((v.co for v in ring), Vector((0, 0, 0))) / len(ring))
+        verts.append(c)
+        for k in range(len(ring)):
+            kn = (k + 1) % len(ring)
+            face = bm.faces.new((c, ring[k], ring[kn]))
+            face.material_index = mat_idx
+    return verts
+
+
+def add_pipe_curve(bm, points, radius, segs, mat_idx):
+    rings = []
+    n = len(points)
+    for i, p in enumerate(points):
+        p = Vector(p)
+        if i < n - 1:
+            tangent = (Vector(points[i + 1]) - p).normalized()
+        else:
+            tangent = (p - Vector(points[i - 1])).normalized()
+        side = Vector((-tangent.y, tangent.x, 0.0))
+        if side.length < 1e-6:
+            side = Vector((1.0, 0.0, 0.0))
+        else:
+            side.normalize()
+        up = tangent.cross(side).normalized()
+        ring = []
+        for k in range(segs):
+            a = 2.0 * math.pi * k / segs
+            ring.append(
+                bm.verts.new(
+                    p + side * (radius * math.cos(a)) + up * (radius * math.sin(a))
+                )
+            )
+        rings.append(ring)
+    return loft_rings(bm, rings, mat_idx, cap_start=True, cap_end=True)
+
+
+def add_handle_bail(bm, x_in, x_out, y0, y1, z, radius, segs, mat_idx):
+    """U-bail with quarter-circle corners so the loft stays on the tube.
+
+    A four-point polyline puts a 90-degree tangent jump at each outer
+    corner; the ring there orients to the next span and the bar sits on
+    the mounting plate instead of entering it.
+    """
+    sign_x = 1.0 if x_out > x_in else -1.0
+    sign_y = 1.0 if y1 > y0 else -1.0
+    rad = min(0.014, abs(x_out - x_in) * 0.40, abs(y1 - y0) * 0.20)
+    pts = [
+        Vector((x_in, y0, z)),
+        Vector((x_out - sign_x * rad, y0, z)),
+    ]
+    c1 = Vector((x_out - sign_x * rad, y0 + sign_y * rad, z))
+    s1 = Vector((0.0, -sign_y * rad, 0.0))
+    e1 = Vector((sign_x * rad, 0.0, 0.0))
+    for i in range(1, 5):
+        a = (math.pi / 2.0) * i / 4.0
+        pts.append(c1 + s1 * math.cos(a) + e1 * math.sin(a))
+    pts.append(Vector((x_out, y1 - sign_y * rad, z)))
+    c2 = Vector((x_out - sign_x * rad, y1 - sign_y * rad, z))
+    s2 = Vector((sign_x * rad, 0.0, 0.0))
+    e2 = Vector((0.0, sign_y * rad, 0.0))
+    for i in range(1, 5):
+        a = (math.pi / 2.0) * i / 4.0
+        pts.append(c2 + s2 * math.cos(a) + e2 * math.sin(a))
+    pts.append(Vector((x_in, y1, z)))
+    add_pipe_curve(bm, pts, radius, segs, mat_idx)
+
+
 def pack_uvs(bm, margin=0.08):
     uv = bm.loops.layers.uv.new("UVMap")
     faces = list(bm.faces)
@@ -122,9 +244,7 @@ def pack_uvs(bm, margin=0.08):
         col = i % cols
         row = i // cols
         nrm = face.normal
-        ax = abs(nrm.x)
-        ay = abs(nrm.y)
-        az = abs(nrm.z)
+        ax, ay, az = abs(nrm.x), abs(nrm.y), abs(nrm.z)
         coords = []
         for loop in face.loops:
             co = loop.vert.co
@@ -149,109 +269,227 @@ def pack_uvs(bm, margin=0.08):
             )
 
 
-def build_crate_mesh(name, bevel_offset, bevel_segments):
-    sx, sy, sz = BODY_SIZE
-    slat_h = SLAT_THICK
+def _span_layout(count, span, rng):
+    """Uneven slat widths that still fill `span` with named gaps."""
+    raw = [1.0 + rng.uniform(-SLAT_JITTER, SLAT_JITTER) for _ in range(count)]
+    s = sum(raw)
+    gap = 0.010
+    usable = span - gap * (count + 1)
+    widths = [usable * r / s for r in raw]
+    pos = -span / 2.0 + gap
+    centres = []
+    for w in widths:
+        centres.append(pos + w / 2.0)
+        pos += w + gap
+    return centres, widths
+
+
+def build_crate_mesh(
+    name,
+    short_skids=False,
+    float_handle=False,
+    omit_slats=False,
+):
+    ix, iy, iz = INNER
+    hx = ix / 2.0 + POST / 2.0
+    hy = iy / 2.0 + POST / 2.0
+    post_h = iz + RAIL_H
+    top_z = SKID_H + post_h
+    rng = random.Random(SLAT_SEED)
     bm = bmesh.new()
+    wood_verts = []
     try:
-        body = add_cube(
-            bm, (0.0, 0.0, sz / 2.0), (sx, sy, sz), WOOD_IDX,
+        skid_z0 = 0.055 if short_skids else 0.0
+        if short_skids:
+            geo = bmesh.ops.create_cube(bm, size=1.0)
+            for v in geo["verts"]:
+                v.co.x *= 0.024
+                v.co.y *= 0.024
+                v.co.z *= 0.006
+                v.co.z += 0.003
+            for f in {f for v in geo["verts"] for f in v.link_faces}:
+                f.material_index = WOOD_IDX
+        # Skids sit under the posts, not inset at the inner wall line —
+        # that left a cave at the outer corner.
+        skid_ys = (-hy, 0.0, hy)
+        for sy in skid_ys:
+            wood_verts.extend(
+                add_box(
+                    bm,
+                    (0.0, sy, skid_z0 + SKID_H / 2.0),
+                    (ix + 2.0 * POST, SKID_W, SKID_H),
+                    WOOD_IDX,
+                )
+            )
+        for sxn in (-1.0, 1.0):
+            for syn in (-1.0, 1.0):
+                wood_verts.extend(
+                    add_box(
+                        bm,
+                        (sxn * hx, syn * hy, SKID_H - TENON + (post_h + TENON) / 2.0),
+                        (POST, POST, post_h + TENON),
+                        WOOD_IDX,
+                    )
+                )
+        # Top rails tenon into the posts — overlapping, not sharing a plane.
+        wood_verts.extend(
+            add_box(
+                bm, (0.0, hy, top_z - RAIL_H / 2.0),
+                (ix + 2.0 * TENON, POST, RAIL_H), WOOD_IDX,
+            )
         )
-        body_edges = list({e for v in body for e in v.link_edges})
-        if bevel_offset > 0.0:
-            bmesh.ops.bevel(
-                bm,
-                geom=body_edges,
-                offset=bevel_offset,
-                segments=bevel_segments,
-                profile=0.5,
-                affect="EDGES",
-                clamp_overlap=True,
+        wood_verts.extend(
+            add_box(
+                bm, (0.0, -hy, top_z - RAIL_H / 2.0),
+                (ix + 2.0 * TENON, POST, RAIL_H), WOOD_IDX,
             )
-
-        slat_w = 0.118
-        n_lid = 5
-        gap = (sy - 0.04 - n_lid * slat_w) / (n_lid + 1)
-        y0 = -sy / 2.0 + 0.02 + gap + slat_w / 2.0
-        for i in range(n_lid):
-            y = y0 + i * (slat_w + gap)
-            add_cube(
-                bm,
-                (0.0, y, sz + slat_h / 2.0),
-                (sx - 0.06, slat_w, slat_h),
-                WOOD_IDX,
+        )
+        wood_verts.extend(
+            add_box(
+                bm, (hx, 0.0, top_z - RAIL_H / 2.0),
+                (POST, iy + 2.0 * TENON, RAIL_H), WOOD_IDX,
+            )
+        )
+        wood_verts.extend(
+            add_box(
+                bm, (-hx, 0.0, top_z - RAIL_H / 2.0),
+                (POST, iy + 2.0 * TENON, RAIL_H), WOOD_IDX,
             )
+        )
+        # Bottom sill tenons into the skid so the shared z=SKID_H plane
+        # is not two coplanar faces (z-fight).
+        sill_h = RAIL_H + TENON
+        sill_z = SKID_H - TENON + sill_h / 2.0
+        wood_verts.extend(
+            add_box(
+                bm, (0.0, hy, sill_z),
+                (ix + 2.0 * TENON, POST, sill_h), WOOD_IDX,
+            )
+        )
+        wood_verts.extend(
+            add_box(
+                bm, (0.0, -hy, sill_z),
+                (ix + 2.0 * TENON, POST, sill_h), WOOD_IDX,
+            )
+        )
+        wood_verts.extend(
+            add_box(
+                bm, (hx, 0.0, sill_z),
+                (POST, iy + 2.0 * TENON, sill_h), WOOD_IDX,
+            )
+        )
+        wood_verts.extend(
+            add_box(
+                bm, (-hx, 0.0, sill_z),
+                (POST, iy + 2.0 * TENON, sill_h), WOOD_IDX,
+            )
+        )
 
-        n_side = 4
-        side_h = 0.095
-        z0 = 0.08 + side_h / 2.0
-        z_step = (sz - 0.16 - side_h) / (n_side - 1)
-        for sign in (-1.0, 1.0):
-            for i in range(n_side):
-                z = z0 + i * z_step
-                add_cube(
+        floor_c, floor_w = _span_layout(N_FLOOR, ix, rng)
+        for c, w in zip(floor_c, floor_w):
+            wood_verts.extend(
+                add_box(
                     bm,
-                    (0.0, sign * (sy / 2.0 + slat_h / 2.0), z),
-                    (sx - 0.10, slat_h, side_h),
+                    (c, 0.0, SKID_H + SLAT_T / 2.0),
+                    (w, iy + TENON, SLAT_T),
                     WOOD_IDX,
                 )
-                add_cube(
+            )
+        lid_c, lid_w = _span_layout(N_LID, ix + POST * 0.5, rng)
+        for c, w in zip(lid_c, lid_w):
+            wood_verts.extend(
+                add_box(
                     bm,
-                    (sign * (sx / 2.0 + slat_h / 2.0), 0.0, z),
-                    (slat_h, sy - 0.10, side_h),
+                    (c, 0.0, top_z + SLAT_T / 2.0),
+                    (w, iy + POST, SLAT_T),
                     WOOD_IDX,
                 )
+            )
 
-        plate = 0.18
-        thick = 0.028
-        hx = sx / 2.0 + slat_h
-        hy = sy / 2.0 + slat_h
-        hz = sz
-        for sxn in (-1.0, 1.0):
-            for syn in (-1.0, 1.0):
-                for szt in (0.0, 1.0):
-                    zc = thick / 2.0 if szt == 0.0 else hz - thick / 2.0
-                    add_cube(
+        if not omit_slats:
+            long_c, long_w = _span_layout(N_LONG, iz - 0.04, rng)
+            for sign in (-1.0, 1.0):
+                y = sign * (iy / 2.0 + POST - SLAT_T / 2.0 - 0.001)
+                for c, w in zip(long_c, long_w):
+                    wood_verts.extend(
+                        add_box(
+                            bm,
+                            (0.0, y, SKID_H + 0.02 + iz / 2.0 + c),
+                            (ix + TENON, SLAT_T, w),
+                            WOOD_IDX,
+                        )
+                    )
+        end_c, end_w = _span_layout(N_END, iz - 0.04, rng)
+        for sign in (-1.0, 1.0):
+            x = sign * (ix / 2.0 + POST - SLAT_T / 2.0 - 0.001)
+            for c, w in zip(end_c, end_w):
+                wood_verts.extend(
+                    add_box(
                         bm,
-                        (sxn * (hx - plate / 2.0), syn * (hy - plate / 2.0), zc),
-                        (plate, plate, thick),
-                        METAL_IDX,
+                        (x, 0.0, SKID_H + 0.02 + iz / 2.0 + c),
+                        (SLAT_T, iy + TENON, w),
+                        WOOD_IDX,
                     )
-                z_bar = hz / 2.0
-                add_cube(
+                )
+
+        if wood_verts:
+            edges = list({e for v in wood_verts for e in v.link_edges if v.is_valid})
+            if edges:
+                bmesh.ops.bevel(
+                    bm,
+                    geom=edges,
+                    offset=0.002,
+                    segments=1,
+                    profile=0.5,
+                    affect="EDGES",
+                    clamp_overlap=True,
+                )
+
+        # L-straps: two plates meeting at a vertical edge, proud of the
+        # post. Not three overlapping cubes — those leave window holes.
+        wrap = IRON_WRAP
+        strap_z0 = 0.006
+        strap_h = top_z - strap_z0
+        zc = strap_z0 + strap_h / 2.0
+        for sxn in (-1.0, 1.0):
+            for syn in (-1.0, 1.0):
+                ox = sxn * (hx + POST / 2.0 + IRON_T / 2.0)
+                oy = syn * (hy + POST / 2.0 + IRON_T / 2.0)
+                add_box(
                     bm,
-                    (sxn * (hx - thick / 2.0), syn * (hy - plate / 2.0), z_bar),
-                    (thick, plate, hz - 2.0 * thick),
+                    (ox, syn * (hy + POST / 2.0 - wrap / 2.0 + IRON_T / 2.0), zc),
+                    (IRON_T, wrap, strap_h),
                     METAL_IDX,
                 )
-                add_cube(
+                add_box(
                     bm,
-                    (sxn * (hx - plate / 2.0), syn * (hy - thick / 2.0), z_bar),
-                    (plate, thick, hz - 2.0 * thick),
+                    (sxn * (hx + POST / 2.0 - wrap / 2.0 + IRON_T / 2.0), oy, zc),
+                    (wrap - IRON_T, IRON_T, strap_h),
                     METAL_IDX,
                 )
 
-        handle_out = 0.038
+        hz = SKID_H + post_h * 0.52
         for sxn in (-1.0, 1.0):
-            hx_bar = sxn * (hx + handle_out)
-            add_cube(
-                bm,
-                (hx_bar, -0.12, sz * 0.48),
-                (0.020, 0.020, 0.12),
-                METAL_IDX,
-            )
-            add_cube(
-                bm,
-                (hx_bar, 0.12, sz * 0.48),
-                (0.020, 0.020, 0.12),
-                METAL_IDX,
+            x_plate = sxn * (ix / 2.0 + POST - SLAT_T / 2.0)
+            x_in = sxn * (ix / 2.0 + POST - SLAT_T - 0.008)
+            x_out = sxn * (ix / 2.0 + POST + HANDLE_OUT)
+            y0, y1 = -0.11, 0.11
+            add_box(
+                bm, (x_plate, y0, hz),
+                (SLAT_T + IRON_T * 2.0, 0.034, 0.044), METAL_IDX,
             )
-            add_cube(
-                bm,
-                (hx_bar, 0.0, sz * 0.54),
-                (0.020, 0.26, 0.020),
-                METAL_IDX,
+            add_box(
+                bm, (x_plate, y1, hz),
+                (SLAT_T + IRON_T * 2.0, 0.034, 0.044), METAL_IDX,
             )
+            if float_handle:
+                add_box(
+                    bm, (x_out, 0.0, hz), (0.020, 0.020, 0.020), METAL_IDX,
+                )
+            else:
+                add_handle_bail(
+                    bm, x_in, x_out, y0, y1, hz, HANDLE_R, 8, METAL_IDX,
+                )
 
         pack_uvs(bm)
         bmesh.ops.recalc_face_normals(bm, faces=list(bm.faces))
@@ -272,29 +510,44 @@ def build_crate_mesh(name, bevel_offset, bevel_segments):
     return obj
 
 
-def principled(name, color, metallic, roughness):
+def principled(name, color, metallic, roughness, noise_scale=0.0, wear=None):
     mat = bpy.data.materials.new(name)
     mat.use_nodes = True
-    bsdf = mat.node_tree.nodes["Principled BSDF"]
+    nt = mat.node_tree
+    bsdf = nt.nodes["Principled BSDF"]
     bsdf.inputs["Base Color"].default_value = color
     bsdf.inputs["Metallic"].default_value = metallic
     bsdf.inputs["Roughness"].default_value = roughness
+    if noise_scale > 0.0 and wear is not None:
+        tex = nt.nodes.new("ShaderNodeTexNoise")
+        tex.inputs["Scale"].default_value = noise_scale
+        tex.inputs["Detail"].default_value = 8.0
+        tex.inputs["Roughness"].default_value = 0.55
+        mix = nt.nodes.new("ShaderNodeMix")
+        mix.data_type = "RGBA"
+        mix.inputs["A"].default_value = color
+        mix.inputs["B"].default_value = wear
+        fac = mix.inputs.get("Factor") or mix.inputs.get("Fac")
+        nt.links.new(tex.outputs["Fac"], fac)
+        nt.links.new(mix.outputs["Result"], bsdf.inputs["Base Color"])
+        rmix = nt.nodes.new("ShaderNodeMix")
+        rmix.data_type = "FLOAT"
+        rmix.inputs["A"].default_value = roughness
+        rmix.inputs["B"].default_value = min(1.0, roughness + 0.18)
+        rfac = rmix.inputs.get("Factor") or rmix.inputs.get("Fac")
+        nt.links.new(tex.outputs["Fac"], rfac)
+        nt.links.new(rmix.outputs["Result"], bsdf.inputs["Roughness"])
     return mat
 
 
 def assign_slots(obj, wood, metal):
-    # Do not materials.clear() — that resets every polygon's material_index
-    # to 0 and the iron brackets vanish into wood.
     mats = obj.data.materials
-    if len(mats) == 0:
-        mats.append(wood)
-        mats.append(metal)
-        return
-    mats[0] = wood
-    if len(mats) == 1:
-        mats.append(metal)
-    else:
-        mats[1] = metal
+    wanted = (wood, metal)
+    for i, mat in enumerate(wanted):
+        if i < len(mats):
+            mats[i] = mat
+        else:
+            mats.append(mat)
 
 
 def world_bbox(obj):
@@ -330,6 +583,226 @@ def uv_stats(mesh):
     return min(us), min(vs), max(us), max(vs), overlap, len(aabbs)
 
 
+def face_area(me, poly):
+    idxs = poly.vertices
+    if len(idxs) < 3:
+        return 0.0
+    v0 = me.vertices[idxs[0]].co
+    area = 0.0
+    for i in range(1, len(idxs) - 1):
+        vs = (me.vertices[idxs[i]].co, me.vertices[idxs[i + 1]].co)
+        area += (vs[0] - v0).cross(vs[1] - v0).length * 0.5
+    return area
+
+
+def hygiene_audit(me):
+    nv, ne, nf = len(me.vertices), len(me.edges), len(me.polygons)
+    ngons = sum(1 for p in me.polygons if len(p.vertices) > 4)
+    zero_area = sum(1 for p in me.polygons if face_area(me, p) <= AREA_EPS)
+    bm = bmesh.new()
+    try:
+        bm.from_mesh(me)
+        bm.verts.ensure_lookup_table()
+        bm.edges.ensure_lookup_table()
+        loose_v = sum(1 for v in bm.verts if len(v.link_edges) == 0)
+        loose_e = sum(1 for e in bm.edges if len(e.link_faces) == 0)
+        nonman = sum(1 for e in bm.edges if not e.is_manifold)
+        ret = bmesh.ops.find_doubles(bm, verts=list(bm.verts), dist=DOUBLES_EPS)
+        doubles = len(ret.get("targetmap") or {})
+    finally:
+        bm.free()
+    return {
+        "nv": nv, "ne": ne, "nf": nf, "ngons": ngons,
+        "loose_v": loose_v, "loose_e": loose_e, "nonman": nonman,
+        "zero_area": zero_area, "doubles": doubles, "euler": nv - ne + nf,
+    }
+
+
+def zfight_pairs(me):
+    data = [
+        (p.center.copy(), p.normal.copy(), frozenset(p.vertices))
+        for p in me.polygons
+    ]
+    eps2 = ZFIGHT_EPS * ZFIGHT_EPS
+    count = 0
+    for i in range(len(data)):
+        ci, ni, vi = data[i]
+        for j in range(i + 1, len(data)):
+            cj, nj, vj = data[j]
+            if (cj - ci).length_squared > eps2:
+                continue
+            if abs(ni.dot(nj)) <= ZFIGHT_COS:
+                continue
+            if vi & vj:
+                continue
+            count += 1
+    return count
+
+
+def shells(me):
+    neighbors = [[] for _ in range(len(me.vertices))]
+    for edge in me.edges:
+        a, b = edge.vertices
+        neighbors[a].append(b)
+        neighbors[b].append(a)
+    seen = [False] * len(me.vertices)
+    groups = []
+    for start in range(len(me.vertices)):
+        if seen[start]:
+            continue
+        seen[start] = True
+        stack = [start]
+        group = []
+        while stack:
+            current = stack.pop()
+            group.append(current)
+            for nxt in neighbors[current]:
+                if not seen[nxt]:
+                    seen[nxt] = True
+                    stack.append(nxt)
+        groups.append(group)
+    return groups
+
+
+def shell_aabb(me, group):
+    pts = [me.vertices[i].co for i in group]
+    return (
+        min(p.x for p in pts), min(p.y for p in pts), min(p.z for p in pts),
+        max(p.x for p in pts), max(p.y for p in pts), max(p.z for p in pts),
+    )
+
+
+def mat_of(me, group):
+    member = set(group)
+    for p in me.polygons:
+        if all(i in member for i in p.vertices):
+            return p.material_index
+    return None
+
+
+def support_audit(me):
+    groups = shells(me)
+    skids = []
+    for g in groups:
+        if mat_of(me, g) != WOOD_IDX:
+            continue
+        a = shell_aabb(me, g)
+        dx, dy, dz = a[3] - a[0], a[4] - a[1], a[5] - a[2]
+        if a[2] < 0.01 and dx > 0.6 and dy < 0.12 and dz < 0.08:
+            skids.append(a)
+    skid_z = min((a[2] for a in skids), default=99.0)
+    return {"skids": len(skids), "skid_z": skid_z}
+
+
+def body_audit(me):
+    wood_ids = set()
+    for p in me.polygons:
+        if p.material_index == WOOD_IDX:
+            wood_ids.update(p.vertices)
+    pts = [
+        me.vertices[i].co for i in wood_ids
+        if me.vertices[i].co.z > SKID_H + 0.01
+    ]
+    if not pts:
+        return {"dx": 0.0, "dy": 0.0, "dz": 0.0}
+    xs, ys, zs = [p.x for p in pts], [p.y for p in pts], [p.z for p in pts]
+    return {
+        "dx": max(xs) - min(xs),
+        "dy": max(ys) - min(ys),
+        "dz": max(zs) - min(zs),
+    }
+
+
+def _bvh_gap(me, hosts, guests):
+    if not hosts or not guests:
+        return 99.0
+    bm_h = bmesh.new()
+    try:
+        bm_h.from_mesh(me)
+        keep = set()
+        for g in hosts:
+            keep.update(g)
+        drop = [
+            f for f in bm_h.faces
+            if not all(v.index in keep for v in f.verts)
+        ]
+        if drop:
+            bmesh.ops.delete(bm_h, geom=drop, context="FACES")
+        if not bm_h.faces:
+            return 99.0
+        tree = BVHTree.FromBMesh(bm_h)
+        worst = 0.0
+        for g in guests:
+            bm_g = bmesh.new()
+            try:
+                bm_g.from_mesh(me)
+                member = set(g)
+                drop_g = [
+                    f for f in bm_g.faces
+                    if not all(v.index in member for v in f.verts)
+                ]
+                if drop_g:
+                    bmesh.ops.delete(bm_g, geom=drop_g, context="FACES")
+                if not bm_g.faces:
+                    worst = max(worst, 99.0)
+                    continue
+                tree_g = BVHTree.FromBMesh(bm_g)
+                if tree.overlap(tree_g):
+                    continue
+                best = 99.0
+                for i in g:
+                    hit = tree.find_nearest(me.vertices[i].co)
+                    if hit[0] is None:
+                        continue
+                    best = min(best, hit[3])
+                if best > worst:
+                    worst = best
+            finally:
+                bm_g.free()
+        return worst
+    finally:
+        bm_h.free()
+
+
+def handle_join(me):
+    groups = shells(me)
+    ends, handles = [], []
+    for g in groups:
+        a = shell_aabb(me, g)
+        dx, dy, dz = a[3] - a[0], a[4] - a[1], a[5] - a[2]
+        if mat_of(me, g) == WOOD_IDX and dx < 0.04 and dy > 0.40 and 0.03 < dz < 0.18:
+            ends.append(g)
+        elif mat_of(me, g) == METAL_IDX and dz < 0.12 and max(dx, dy) > 0.15:
+            handles.append(g)
+    return _bvh_gap(me, ends, handles)
+
+
+def slat_join(me):
+    groups = shells(me)
+    posts, slats = [], []
+    for g in groups:
+        if mat_of(me, g) != WOOD_IDX:
+            continue
+        a = shell_aabb(me, g)
+        dx, dy, dz = a[3] - a[0], a[4] - a[1], a[5] - a[2]
+        if dz > 0.30 and dx < 0.08 and dy < 0.08:
+            posts.append(g)
+        elif 0.04 < dz < 0.16 and dx > 0.40 and dy < 0.030:
+            slats.append(g)
+    return _bvh_gap(me, posts, slats)
+
+
+def add_stray_vert(me):
+    bm = bmesh.new()
+    try:
+        bm.from_mesh(me)
+        bm.verts.new((0.0, 0.0, 0.40))
+        bm.to_mesh(me)
+        me.update()
+    finally:
+        bm.free()
+
+
 def make_lod(obj, name, ratio, skip_decimate):
     mesh = obj.data.copy()
     lod = bpy.data.objects.new(name, mesh)
@@ -343,7 +816,6 @@ def make_lod(obj, name, ratio, skip_decimate):
 
 
 def convex_hull_collider(obj, name):
-    # Duplicated from snippets/convex_hull_collider.py (not a package).
     mesh = bpy.data.meshes.new(name)
     bm = bmesh.new()
     try:
@@ -365,13 +837,12 @@ def convex_hull_collider(obj, name):
     return collider
 
 
-def setup_bake_image(obj, wood, size=BAKE_RES):
-    # Adapted from snippets/setup_bake_target_image.py — do not replace slots.
+def setup_bake_image(obj, target_mat, size=BAKE_RES):
     if not obj.data.uv_layers:
         return None, None
     img = bpy.data.images.new("CrateNrm", size, size, alpha=True, float_buffer=False)
     img.colorspace_settings.name = "Non-Color"
-    nodes = wood.node_tree.nodes
+    nodes = target_mat.node_tree.nodes
     tex = nodes.new("ShaderNodeTexImage")
     tex.image = img
     nodes.active = tex
@@ -381,7 +852,6 @@ def setup_bake_image(obj, wood, size=BAKE_RES):
 
 
 def bake_normal(high, low):
-    # Duplicated from snippets/bake_normal_high_to_low.py (not a package).
     scene = bpy.context.scene
     scene.render.engine = "CYCLES"
     scene.cycles.device = "CPU"
@@ -406,7 +876,6 @@ def bake_normal(high, low):
 
 
 def export_unity(path, objects):
-    # Duplicated from snippets/export_preset_unity.py (not a package).
     for ob in bpy.context.view_layer.objects:
         ob.select_set(False)
     for ob in objects:
@@ -422,14 +891,39 @@ def export_unity(path, objects):
     )
 
 
-def check(skip_decimate):
+def check(
+    skip_decimate,
+    lift_z=False,
+    stray_vert=False,
+    short_skids=False,
+    float_handle=False,
+    omit_slats=False,
+):
     bpy.ops.wm.read_factory_settings(use_empty=True)
-    low = build_crate_mesh("CrateLow", bevel_offset=0.028, bevel_segments=2)
-    high = build_crate_mesh("CrateHigh", bevel_offset=0.028, bevel_segments=4)
-    wood = principled("CrateWood", (0.48, 0.22, 0.07, 1.0), 0.0, 0.50)
-    metal = principled("CrateMetal", (0.14, 0.13, 0.12, 1.0), 0.86, 0.36)
+    flags = dict(
+        short_skids=short_skids,
+        float_handle=float_handle,
+        omit_slats=omit_slats,
+    )
+    low = build_crate_mesh("CrateLow", **flags)
+    high = build_crate_mesh("CrateHigh", **flags)
+    wood = principled(
+        "CrateWood", (0.48, 0.22, 0.07, 1.0), 0.0, 0.50,
+        noise_scale=7.0, wear=(0.28, 0.14, 0.05, 1.0),
+    )
+    metal = principled(
+        "CrateMetal", (0.18, 0.17, 0.16, 1.0), 0.86, 0.36,
+        noise_scale=5.0, wear=(0.10, 0.09, 0.08, 1.0),
+    )
     assign_slots(low, wood, metal)
     assign_slots(high, wood, metal)
+    if stray_vert:
+        add_stray_vert(low.data)
+    if lift_z:
+        for v in low.data.vertices:
+            v.co.z += LIFT_Z
+        low.data.update()
+        bpy.context.view_layer.update()
 
     if low.data is None or len(low.data.polygons) < 6:
         return fail("crate mesh did not build", 3), None, None, None, None, None
@@ -461,7 +955,9 @@ def check(skip_decimate):
     r1 = lod1_tris / base_tris if base_tris else 0.0
     r2 = lod2_tris / base_tris if base_tris else 0.0
 
-    collider = convex_hull_collider(low, "CrateCollider")
+    collider_src = build_crate_mesh("CrateColSrc", **flags)
+    collider = convex_hull_collider(collider_src, "CrateCollider")
+    bpy.data.objects.remove(collider_src, do_unlink=True)
     col_tris = triangle_count(collider.data)
 
     export_path = os.path.join(
@@ -473,9 +969,14 @@ def check(skip_decimate):
     export_unity(export_path, [low, collider])
     export_size = os.path.getsize(export_path) if os.path.isfile(export_path) else 0
 
-    print(
-        f"blender={tuple(bpy.app.version)} skip_decimate={skip_decimate}"
-    )
+    hyg = hygiene_audit(low.data)
+    zf = zfight_pairs(low.data)
+    sup = support_audit(low.data)
+    body = body_audit(low.data)
+    hj = handle_join(low.data)
+    sj = slat_join(low.data)
+
+    print(f"blender={tuple(bpy.app.version)} skip_decimate={skip_decimate}")
     print(
         f"measured base_tris={base_tris} lod1_tris={lod1_tris} "
         f"lod2_tris={lod2_tris} r1={r1:.4f} r2={r2:.4f}"
@@ -492,6 +993,16 @@ def check(skip_decimate):
         f"measured collider_tris={col_tris} bake={bake_result} "
         f"bake_has_data={img.has_data} export_bytes={export_size}"
     )
+    print(
+        f"measured hygiene loose_v={hyg['loose_v']} loose_e={hyg['loose_e']} "
+        f"nonman={hyg['nonman']} zero_area={hyg['zero_area']} "
+        f"doubles={hyg['doubles']} ngons={hyg['ngons']} zfight={zf}"
+    )
+    print(
+        f"measured supports skids={sup['skids']} skid_z={sup['skid_z']:.5f} "
+        f"body=({body['dx']:.4f},{body['dy']:.4f},{body['dz']:.4f}) "
+        f"handle_join={hj:.5f} slat_join={sj:.5f}"
+    )
 
     if not (BASE_TRIS_MIN <= base_tris <= BASE_TRIS_MAX):
         return fail(
@@ -508,6 +1019,11 @@ def check(skip_decimate):
             f"metal faces {idx_counts.get(METAL_IDX, 0)} < {METAL_FACES_MIN}",
             5,
         ), None, None, None, None, None
+    if idx_counts.get(WOOD_IDX, 0) < WOOD_FACES_MIN:
+        return fail(
+            f"wood faces {idx_counts.get(WOOD_IDX, 0)} < {WOOD_FACES_MIN}",
+            5,
+        ), None, None, None, None, None
     if u0 < -UV_EPS or v0 < -UV_EPS or u1 > 1.0 + UV_EPS or v1 > 1.0 + UV_EPS:
         return fail(
             f"UVs outside 0..1: ({u0:.4f},{v0:.4f})-({u1:.4f},{v1:.4f})",
@@ -551,6 +1067,44 @@ def check(skip_decimate):
         ), None, None, None, None, None
     if export_size <= 0:
         return fail("export file missing or empty", 13), None, None, None, None, None
+    if (
+        hyg["loose_v"] or hyg["loose_e"] or hyg["nonman"]
+        or hyg["zero_area"] or hyg["doubles"] or hyg["ngons"] or zf
+    ):
+        return fail(
+            f"hygiene loose_v={hyg['loose_v']} loose_e={hyg['loose_e']} "
+            f"nonman={hyg['nonman']} zero_area={hyg['zero_area']} "
+            f"doubles={hyg['doubles']} ngons={hyg['ngons']} zfight={zf}",
+            15,
+        ), None, None, None, None, None
+    if abs(bb[2]) > ZMIN_EPS:
+        return fail(
+            f"zmin {bb[2]:.6f} not within {ZMIN_EPS} of 0 "
+            "(--lift-z is the designed fail)",
+            16,
+        ), None, None, None, None, None
+    if sup["skids"] < 3 or sup["skid_z"] > SKID_Z_MAX:
+        return fail(
+            f"skid supports {sup['skids']} skid_z={sup['skid_z']:.5f} "
+            "(--short-skids is the designed fail)",
+            16,
+        ), None, None, None, None, None
+    if hj > HANDLE_JOIN:
+        return fail(
+            f"handle-end gap {hj:.5f} > {HANDLE_JOIN} "
+            "(--float-handle is the designed fail)",
+            17,
+        ), None, None, None, None, None
+    if sj > SLAT_JOIN:
+        return fail(
+            f"slat-post gap {sj:.5f} > {SLAT_JOIN} "
+            "(--omit-slats is the designed fail)",
+            18,
+        ), None, None, None, None, None
+    if abs(body["dx"] - BODY_X) > BODY_TOL:
+        return fail(f"body dx {body['dx']:.4f} off {BODY_X}", 19), None, None, None, None, None
+    if abs(body["dy"] - BODY_Y) > BODY_TOL:
+        return fail(f"body dy {body['dy']:.4f} off {BODY_Y}", 19), None, None, None, None, None
     return 0, low, high, wood, tex, collider
 
 
@@ -618,10 +1172,10 @@ def light(name, loc, energy, size, col, rot):
     cam_data = bpy.data.cameras.new("Cam")
     cam_data.lens = 50.0
     cam = bpy.data.objects.new("Cam", cam_data)
-    cam.location = (2.25, -2.75, 1.38)
+    cam.location = (1.96, -2.44, 1.32)
     scene.collection.objects.link(cam)
     aim = bpy.data.objects.new("Aim", None)
-    aim.location = (0.0, 0.0, 0.40)
+    aim.location = (0.0, 0.0, 0.30)
     scene.collection.objects.link(aim)
     con = cam.constraints.new("TRACK_TO")
     con.target = aim
@@ -650,7 +1204,6 @@ def light(name, loc, energy, size, col, rot):
 
     fcode = gallery_framing.check_framing(
         scene, cam, hero=[low], elements=[low], stage=[floor, wall],
-        strategy="projection",
     )
     if fcode:
         return fcode
@@ -665,14 +1218,22 @@ def main():
     p = argparse.ArgumentParser()
     p.add_argument("--output", default=None)
     p.add_argument("--engine", default="eevee", choices=("eevee", "cycles"))
-    p.add_argument(
-        "--skip-decimate",
-        action="store_true",
-        help="falsification: skip the LOD DECIMATE stage",
-    )
+    p.add_argument("--skip-decimate", action="store_true")
+    p.add_argument("--lift-z", action="store_true")
+    p.add_argument("--stray-vert", action="store_true")
+    p.add_argument("--short-skids", action="store_true")
+    p.add_argument("--float-handle", action="store_true")
+    p.add_argument("--omit-slats", action="store_true")
     args = p.parse_args(argv)
 
-    code, low, _high, wood, tex, _col = check(args.skip_decimate)
+    code, low, _high, wood, tex, _col = check(
+        args.skip_decimate,
+        lift_z=args.lift_z,
+        stray_vert=args.stray_vert,
+        short_skids=args.short_skids,
+        float_handle=args.float_handle,
+        omit_slats=args.omit_slats,
+    )
     if code:
         return code
     if args.output: