HartOMat

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Hartmut 253f11a945 feat: surface-evaluated normals, GMSH tessellation, draw call batching

USD exporter:
- Compute normals from B-Rep surface via BRepLProp_SLProps at each vertex
  UV parameter — eliminates faceting on curved surfaces (same as Stepper)
- Add GMSH Frontal-Delaunay tessellation engine (opt-in via --tessellation_engine gmsh)
  with per-solid strategy matching export_step_to_gltf.py
- Use vertex normal interpolation instead of faceVarying (6x smaller normals)
- Default engine remains OCC (GMSH has coordinate-space bug with instanced parts)

Frontend:
- Fix faceted shading in InlineCadViewer: only call computeVertexNormals()
  when geometry lacks normals, preserving smooth GLB normals from pipeline
- Add useGeometryMerge hook for draw call batching (merge by material)
- Fix unused import in cadUtils, optional props in ThreeDViewer

Backend:
- Move dataclass import to top of step_processor.py (PEP 8)
- Unified single-read STEP metadata extraction with fallback

Render worker:
- Fix USD import seam/sharp restoration: read primvars via pxr directly
  (Blender's USD importer doesn't expose custom Int2Array primvars)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-13 15:14:23 +01:00