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• PxrUnified integrator is currently experimental as it does not yet support all the standard rendering features.
• Meshlights cannot be instanced
• Load on demand procedurals are not supported anymore, all procedurals are now loaded immediately
• We do not read point data from OpenVDB files
• PxrSurface back diffuse color is not output to the albedo color AOV
• Analytical lights placed inside volumes may yield artifacts when made visible to the camera. As a work around, the light camera visibility should be turned off, and a geometry with a similar shape should be used (visible to camera, invisible to transmission and indirect rays), with the proper emissive bxdf.
• Using the ' . ' character in the handle for an OSL shader could cause unpredictable results during re-rendering.
• Per-Instance baking is not supported, only the reference instance.
• 3d baking: no direct bake-to-ptex support.
• PxrBakePointCloud cannot directly render ptex.
• Sample/Display filter plug-ins do not have access to lighting services for light dependent effects, e.g. lens flare.
• Adding new mesh light on existing geometry during IPR results in double geometry.
• Motion blurred polygons do not motion blur normals when deformed. Use Subdivision meshes instead.
• When attempting to access an array primvar, you must first check the size of the array primvar and allocate the appropriate space. Not doing so may lead to a crash.

• Points and curves cannot be used as geometric lights

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  Deformation motion blurred volumes don't currently work with densityFloatPrimVar or densityColorPrimVar. You will need to use a PxrPrimVar node connected to densityFloat and densityColor instead.

RenderMan XPU

• XPU does not yet support the ability to use primvars to dynamically construct a file name or file path for textures.
• See the XPU section of the documentation for a further list of limitations.