f6ffb93a39
- roof-system: replace BoxGeometry placeholders (initial swap + empty-roof merged shell) with a group-less degenerate geometry — a Box's 6 groups against the roof's 4-material array crashed GLTFExporter on every scene with a segment-less roof node (prod: 'reading isShaderMaterial'), and count-0 groups crash MeshBVH's packed-tree build. - glb-export: sanitizeMaterialGroups pass repairs any mesh whose geometry groups don't line up with its material array before GLTFExporter runs. - export-manager: give neutralised (attribute-less) meshes an empty position attribute before STL/OBJ export — both exporters read position.count unconditionally. - bake-exporter: log the full error stack so the bake worker's console relay captures it in the job's error trail. - viewer: host-controlled disablePostFx prop (Viewer → PostProcessing) that skips building the SSGI/denoise pipeline entirely; the ?disable=postFx URL flag previously only bypassed it per-frame while still allocating it. Co-authored-by: Claude Fable 5 <noreply@anthropic.com>