tinyusdz/doc/usdObj.md

usdObj in TinyUSDZ

TinyUSDZ has built-in support of usdObj(wavefront .obj import). Why built-in?

• It is not recommended to use plug-in architecture(e.g. separated dll) for mobile/wasm devices.
• People frequently want .obj support

.obj support is enabled by default. You can disable usdObj support by cmake flags(TINYUSDZ_USE_USDOBJ=Off)

Data structure

• Shape(group/object) hierarchy is flattened to single mesh and no material.
• Texcoords and normals are decoded as face-varying attribute.

Limitations

• No material info is parsed
• No per-object and per-face material

TODO

• Preserve shape hierarchy
• per-face material
  • Decode to GeomSubset?
• Loading Skin weight(tinyobjloader's extension)