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Materials

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Format	Open	Export	Hierarchy	Materials	Vertex colours	Notes
STEP / STP	●	—	●	●	—	Native CAD; routed through local Python (OpenCascade).
GLB	●	●	●	PBR	●	Best all-round. Recommended for Cinema 4D 2026.
glTF	●	●	●	PBR	●	JSON variant of GLB. Same capabilities, larger.
FBX	●	●	●	●	—	Maya, Blender, Unreal, 3ds Max. Binary 7.4 default; ASCII fallback.
USDZ	—	●	●	●	—	Apple Quick Look, Reality Composer, Cinema 4D R26+.
OBJ	●	●	flat	via .mtl	—	Universal but no transforms; hierarchy baked into names.
3MF	●	—	●	●	—	3D-printing standard. Import only for now.
STL	●	●	single mesh	—	—	Geometry only. 3D printing.
PLY	—	●	single mesh	—	●	Geometry + per-vertex colours. Research / scanning.
CSV	—	●	n/a	n/a	n/a	Parts list / BOM. No geometry written.

Hierarchy — whether the format preserves the assembly tree (groups / nested transforms) on round-trip. Materials — color + shading info per part. PBR means full metalness/roughness; plain ● is diffuse only. Vertex colours — per-vertex RGB baked into the geometry (no separate material).

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