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| Info | ||
|---|---|---|
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| As the light selection scheme in this phase one release of XPU is yet to be implemented, we recommend keeping the number of lights in your scene to a minimum, preferring to look develop your assets illuminated via a single PxrDomeLight for example. |
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Geometry
| Geometry | RIS | XPU | Notes |
|---|---|---|---|
Subdivision Surfaces | ✅ | ✅ | Catmull-Clark only |
Polygonal Surfaces | ✅ | ✅ | |
Nurbs | ✅ | ❌ | |
Curves | ✅ | ✅ | |
Points | ✅ | ✅ | Some features not available |
| Quadrics and Blobbies | ✅ | ❌ | |
| Nested Instancing | ✅ | ❌ |
Notes :
- Loop Subdivision. Catmull-Clark for both quads and triangles is supported
- Points. Have been partially implemented. Point falloff is not yet supported
- The built-in curvature doesn't match RIS and will be receiving enhancements in a future release
- Object attributes such as maxdiffusedepth and maxspeculardepth not yet implemented
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Integrators
| Integration & Ray Tracing | RIS | XPU | Notes |
|---|---|---|---|
PxrPathTracer |
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| ✅ | ✅ | Some features not available | |
PxrUnified | ✅ | ❌ | |
PxrVisualizer | ✅ | ✅ | Some features not available |
Trace Sets | ✅ | ❌ |
Notes :
- numBxdfSamples, numLightSamples, numIndirectSamples (and their manually set counterparts) are not supported.
- PxrOcclusion , PxrVisualizer and PxrUnified are is not yet supported.
- clampDepth and clampLuminance (used to suppress fireflies) have not been implemented
- Russian Roulette has not been implemented
- allowCaustics is always 1
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Rendering
| Post Processing | RIS | XPU | Notes |
|---|---|---|---|
Sample and Display Filters | ✅ | ❌ |
| Pipeline | RIS | XPU | Notes |
|---|---|---|---|
AOVs and LPEs | ✅ | ❌ | |
EXR, TIFF | ✅ | ✅ | |
Deep Output | ✅ | ❌ | |
Holdouts | ✅ | ❌ | |
| PxrCamera | ✅ | ❌ |
Notes :
- XPU currently only outputs EXR or TIFF frames
PxrCamera not supported yet. - Adaptive sampling is yet to be implemented
- Motion blur has not been fully implemented
- Trace Subsets have not been implemented. This then impacts the subsurfaceSubset feature of PxrSurface
Volumes not yet implemented
User defined AOVs or LPEs not yet implemented - Only some geometric built-in AOVs are available under the same name they are available for RIS
Holdouts, shadow collectors not yet implemented - Deep Output. Coming soon.
- Multi-camera, multi-frame are not yet supported
PxrOcclusion, PxrUnified integrators are not supported. - The built-in curvature calculation different is different to RIS, which results in differences in specular mollification.
- The "weighted" option for the pixelfiltermode parameter to the Hider is not yet supported.
- Procedurals not supported. However, if you are using the latest XGen in Maya, you should get renders of your data.
- Baking - either at the pattern level via PxrBakeTexture or at the renderer level to bake global illumination is not yet supported.