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• XPU currently only outputs EXR or TIFF frames.
• Adaptive sampling is yet to be implemented.
• Motion blur has not been fully implemented. Transformation motion blur is fully functional, but deformation motion blur of geometry is not supported.
• Trace Subsets have not been implemented.  This impacts the subsurfaceSubset feature of PxrSurface.
• Only some geometric built-in AOVs are available under the same name as they are available for RIS.
• Deep Output. Coming soon.
• Multi-camera, multi-frame is not yet 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.
• Baking - either at the pattern level via PxrBakeTexture or at the renderer level to bake global illumination is not yet supported.

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