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Index | Known Issues

Known Issues

USD Support

Falcor's USD importer implements a subset of the full USD specification. The following provides an overview of some of the USD features not supported by the Falcor USD importer.

General

  • UsdPhysics is unsupported.
  • UsdVariantSets do not function properly.
  • Animation of camera parameters (aperture size, etc.) is not supported.
  • Only per-vertex skinning data is supported. In particular, constant skinning data is not supported.
  • A maximum of 4 bones per vertex are supported. Additional bones will be ignored, and a warning issued.

UsdGeom

  • UsdGeomCapsule, UsdGeomCone, UsdGeomCube, UsdGeomCylinder, UsdGeomHermiteCurves, UsdGeomNurbsCurves, UsdGeomNurbsPatch, and UsdGeomPoints are unsupported
  • Instancing of UsdGeomBasisCurves is not supported.
  • DisplayColor interpolation modes are ignored.
  • Pivot transformations are not supported.

UsdLux

  • UsdLuxShapingAPI and UsdLuxShadowAPI are not supported.
  • UsdLuxCylinderLight and UsdLuxPortalLight are not supported.
  • Instancing of lights is not supported.

UsdPreviewSurface

  • Only the metallic workflow is supported. A warning will be issued when UsdPreviewSurface shaders that use the specular workflow are encountered.
  • The clearcoat, clearcloatRoughness, occlusion and displacement inputs of UsdPreviewSurface are not supported.
  • The bias, scale, wrapS, and wrapT inputs of UsdUVTexture are not supported.
  • Transform2d nodes are not supported.