The geometry GLB from export_step_to_gltf.py contains a 'custom_normal' attribute
(CORNER, INT16_2D) from OCC tessellation. If left in place, Blender's glTF exporter
re-exports these pre-baked normals unchanged — ignoring shade_smooth_by_angle
processing and our explicit sharp edge marks.
Fix: remove the 'custom_normal' attribute from all imported mesh objects immediately
after GLB import, before applying smooth shading. Also add orphans_purge() before
export to remove palette materials (mat_0/1/2/3) that become users=0 after library
material substitution.
Same custom_normal clearing applied to blender_render.py for thumbnail renders.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Sharp edges:
- OCC→Blender coordinate transform was wrong: Blender(X,Y,Z) = OCC(X×0.001, -Z×0.001, Y×0.001)
(RWGltf Z→Y-up + Blender Y→Z-up cancel to Y↔Z swap with Z negated)
- Guard against degenerate edges (idx0==idx1) to prevent bmesh ValueError
- Use obj.matrix_world @ v.co for world-space KD-tree (assembly node transforms)
Materials:
- Single-material fallback: if only 1 library material loaded, apply to all
unmatched objects (cadquery vs RWGltf part names differ, name-match covers ~2/25)
- Fix mesh data sharing: obj.data.copy() before materials.clear() to avoid
clearing shared data blocks
- Use obj.name (not id(obj)) for cross-loop tracking — Blender Python wrappers
can be recreated between iterations
Both fixes applied to export_gltf.py (production GLB) and blender_render.py (thumbnails).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
OCC's RWGltf_CafWriter appends _AF0/_AF1 assembly-instance suffixes to
mesh object names when a part appears multiple times in an assembly.
The material matching in export_gltf.py only stripped Blender's .001
suffix, leaving 24/175 GLB objects without materials.
Fix: strip _AFN suffixes via while loop (handles nested _AF0_AF1),
add prefix fallback (longest key wins) as last resort before no-match.
Also improve build_materials_from_excel Jaccard matching:
- Strip _AFN and numeric hash suffixes (-21227) before tokenizing
- Add prefix-based fallback (step 3) before position fallback (step 4)
- Raise threshold 0.3 → 0.35 for better precision
- Guard prefix matches to len >= 5 to prevent trivial false positives
Result: Material substitution: 175/175 mesh objects assigned (was 151/175)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
4 root causes fixed:
1. export_colors=False was removed in Blender 4.x — caused every Blender
export to fail (exit 1) and always fall back to trimesh. Remove it.
Blender now runs the full pipeline: materials + sharp edges.
2. GlbModel cloned ref never reset on url change — key={glbBlobUrl} forces
React to remount GlbModel on each new blob URL, resetting the ref so
fresh geometry is always loaded.
3. glbBlobUrl not cleared before re-fetch — setGlbBlobUrl(null) added at
start of downloadUrl effect so spinner shows instead of stale mesh.
4. staleTime: 30_000 delayed picking up new MediaAsset after generation.
Changed to staleTime: 0 so invalidation always triggers immediate refetch.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Linked materials are external references — Blender's GLTF exporter cannot
traverse their node trees to extract Principled BSDF PBR values (metallic,
roughness, base color, normal maps). Appended materials are local copies
that the exporter can fully traverse.
Changes:
- asset_library.py: add link=True parameter (default unchanged for renders)
- export_gltf.py: call apply_asset_library_materials with link=False
- export_gltf.py: add export_materials='EXPORT' + export_image_format='AUTO'
to embed textures and ensure full PBR data in the GLB
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- bpy.ops.import_mesh.stl → bpy.ops.wm.stl_import (removed in Blender 4.0)
- mesh.use_auto_smooth = True → bpy.ops.object.shade_smooth_by_angle()
(use_auto_smooth removed in Blender 4.1)
- Apply smooth shading to all objects unconditionally after scale, so
GLB is smooth-shaded even when no sharp edge midpoints are present
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Bug A: Media Library thumbnails were gray because <img src> cannot send
JWT auth headers. Added useAuthBlob() hook (fetch + createObjectURL) in
MediaBrowser.tsx. Also fixed publish_asset Celery task to populate
product_id + cad_file_id on MediaAsset for thumbnail fallback resolution.
Bug B: Product dimensions now shown in Product Details card with Ruler
icon and "from CAD" label when cad_mesh_attributes.dimensions_mm exists.
Bug C: Replaced 128×128 CAD thumbnail with InlineCadViewer component.
Queries gltf_geometry MediaAssets, fetches GLB via auth fetch → blob URL
→ Three.js Canvas with OrbitControls. Falls back to thumbnail + "Load 3D
Model" button. Polling when GLB generation is in progress.
Bug D: trimesh was in [cad] optional extra but Dockerfile only installed
[dev]. Changed to pip install -e ".[dev,cad]" — trimesh now available in
backend container, GLB + Colors export works.
Also added bbox extraction (STL-first numpy parsing) in render_step_thumbnail
and admin "Re-extract CAD Metadata" bulk endpoint.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Hartmut