Implementation status(v0.9.0)

• ✅ = Supported.
• ❕ = Partially supported or has limitation.
• 🚧 = Work in progress.
• empty cell = not yet supported.

NOTE: TinyUSDZ API is subject to change NOTE: USDC(Binary) = Read only

Core features

• Robust USDA ASCII parsing(No segfault for corrupted input)
• ASCII export
• Robust USDC parsing(No segfault for corrupted input)
• Robust USDZ parsing(No segfault for corrupted input)
• Tydra: Vulkan/OpenGL friendly scene graph conversion
• Basic USD composition support.
• JS/WASM support
  • Supports loading USDA/USDC/USDZ
  • Supports basic composition.
  • UsdPreviewSurface is converted to Three.js MeshPhysicalMaterial

Generic Prim types

type	Ascii	USDC	Comment
Model	✅	✅	def with no prim type
Scope	✅	✅	no-op prim

Geometry(usdGeom)

type	Ascii	USDC	Comment
Xform	✅	✅
Mesh	✅	✅
GeomSubset	✅	✅	Supports 'point' type
Points	✅	✅
Cube	✅	✅
Cylinder	✅	✅
Sphere	✅	✅
Capsule	✅	✅
Cone	✅	✅
BasisCurves	✅	✅	for hair/fur
NurbsPatch
NurbsCurves	✅	✅
HermiteCurves
PointInstancer	✅	✅

Camera(usdGeom)

type	Ascii	USDC	Comment
Camera	✅	✅

Lights(usdLux)

type	Ascii	USDC	Comment
DistantLight	✅	✅
DiskLight	✅	✅
RectLight	✅	✅
SphereLight	✅	✅
CylinderLight	✅	✅
DomeLight	✅	✅
GeomtryLight
PortalLight
PluginLight			Light shader

• Light sets, light shaping, shadowAPI, LightFiler, etc are not supported yet.

Material, shader(usdShade, usdImaging plugin)

type	Ascii	USDC	Comment
UsdPreviewSurface	✅	✅
UsdUVTexture	✅	✅	1.
UsdPrimvarReader	✅	✅

1. UDIM texture is not supported.

Skinning, BlendShapes(usdSkel)

type	Ascii	USDC	Comment
SkelRoot	✅	✅	Parsing only
Skeleton	✅	✅	Parsing only
SkelAnim	✅	✅	Parsing only
BlendShape	✅	✅	Supports inbetween blendshape attribute

• Skeleton utility functions(e.g. build joint hiearchy from list of token[]) are provided in Tydra.

Work in progress

• Custom filesystem handler(Asset Resolution)
• Composition(VariantSet) syntax
  • Nested variant
  • VariantSet Ascii parse
  • VariantSet Ascii print
  • VariantSet Crate parse
  • VariantSet(SpecTypeVariant) Crate write
• USDC serialization
• Skinning evaluation/validation
• Tydra(scene/render delegation)
• usdObj(wavefront .obj) support.
  • Please see usdObj.md
• C-API for other languages
• Python binding and package.
• Composition Arcs
  • Parsing some Composition Arcs possible, needs more testing/validations.
  • subLayers
  • references
  • payloads(delayed load)
  • variants/variantSets
  • specializers(priority is low)

TODO

• Performance optimization
• UDIM texture
• MeshLight(GeometryLight)
• Collection API
  • e.g. Light Sets
• Delayed load of Layer/Stage
• Instancing
• Volume(usdVol)
  • MagicaVoxel vox for Volume?
  • VDBVolume support through TinyVDBIO? https://github.com/syoyo/tinyvdbio
• Audio(usdAudio)
• MaterialX support(usdMtlx)
• Physics(usdPhysics)
• and more...

EoL.