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| Geometry | RIS | XPU | Notes |
|---|---|---|---|
Subdivision Surfaces | ✅ | ✅ | Catmull-Clark only. No support for hierarchical subdivision surfaces. |
Polygonal Surfaces | ✅ | ✅ | |
Nurbs | ✅ | ❌ | |
Curves | ✅ | ✅ | |
Points | ✅ | ✅ | Some features Falloff is not availablesupported |
| Quadrics and Blobbies | ✅ | ❌ | |
| Procedurals | ✅ | ❌ | |
| Nested Instancing | ✅ | ✅ | Varying attributes to drive differences in materials per-instance is not yet supported. Only 4 levels of nested instancing are supported. |
| Watertight dicing of subdivision surfaces | ✅ | ✅ | XPU cannot opt out of watertight dicing. |
| Watertight dicing of displaced polygonal surfaces | ❌ | ✅ | XPU cannot opt out of watertight dicing. |
| Nested dielectrics | ✅ | ❌ | XPU does not support intersectpriority or nested IOR tracking; refractions may be wrong when leaving an inner nested dielectric material |
| Dicing cameras | ✅ | ❌ |
- Loop Subdivision is not supported. Catmull-Clark for both quads and triangles is supported.
- Point falloff is not yet supported.
- Object attributes such as maxdiffusedepth and maxspeculardepth have not yet been implemented.
- Deformation motion blur is not yet supported.
Shading of nested instancing has artifacts. In our tests we have seen shading issues with leaves that are rendered as nested instances.
Inverted normals are possible when doing displacement, depending on the input file and DCC. We have seen this with Alembic being imported into Houdini.
- String and matrix geometry primvars are not supported.
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