Known Limitations

Interactive/Live Rendering Limitations

• Bucket size cannot be changed during live rendering
• Changes to Presence do not update when using the opacity cache option
• Motion Blur will disappear during interactive rendering with scene changes
• Objects are not re-diced during interactive camera edits
• Mesh lights cannot be interchanged as geometry without a restart

RenderMan Pro Server

• When baking illumination sample filters and display filters are not currently supported and may lead to a crash.
• 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.