Content Comparison

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• macOS/Apple Silicon: The denoiser is not supported on Apple Silicon, even with Rosetta.  RMAN-20408

• If your image has NaNs from either RIS or XPU, the denoiser will fail on macOS and Windows. 

• The interactive denoiser currently is not supported in XPU.

• The progress bar in the Denoise App doesn’t currently work. RMAN-23054

XPU

• The GPU portion of XPU can render artifacts with trace:reflectexcludesubset.  RMAN-20393

• Support for homogeneous single scattering in PxrSurface is incomplete. Renders will be noticeably incorrect after the first bounce off the interior of a closed object. RMAN-16374

• Lights inside objects with homogeneous single scattering in PxrSurface will not compute the correct shadows. RMAN-16367

• Due to differences in how XPU computes derivatives for normals, XPU may compute different results from RIS for bump mapped subdivision surfaces in areas of highly concave curvature, combined with a high bump scale. This happens especially when the bump mapping cannot reasonably approximate the displacement. Note that this difference does not occur with displacement. The issue can be ameliorated by reducing the bump scale. RMAN-21977 

• Please refer to the XPU section of the documentation for a more detailed current list of limitations.

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• When batch rendering from a RIB exported from Houdini, the searchpath may contain an invalid path that causes RenderMan to load the wrong OpenVDB shared library, causing batch renders to fail.  The workaround is to edit the "procedural" searchpath in the RIB to $RMANTREE/lib/plugins instead of the one in the RenderMan for Houdini directory.  RMAN-20297

• RfSolaris: Texture memory limits are not properly respected.  RMAN-20563

• Denoise ROP does not work in H20, py3.10. In py3.9, it will work if loppath on the usdrender_rop LOP node is set to opinput('.', 0) - RMAN-21926

RenderMan for Maya

• F-Stop is divided by 10X with PxrCamera.  RMAN-20475

• Overriding PYTHONPATH can cause denoising to fail.  RMAN-20546

• Adding multiple AOVs whilst running RenderMan in the viewport can cause Maya to crash

• When using the ROI tool and the interactive denoiser in Maya’s viewport can cause Maya to crash

• The QFontMetrics.width method has been removed in PySide6, so this bug only affects RfM in maya 2025.  RfM has a few spots where the method is used and leads to a python error. This also affects the PxrOSL node's code editor widget, which doesn't work at all in maya2025.

• Using the Interactive Denoiser in the viewport whilst in XPU is not supported yet and will display visual inconsistencies.

• Maya Fluids are not supported.

RenderMan for Blender

• Canceling a render from "it" will crash Blender. One workaround is to cancel the render from Blender.

• Translating Cycles shading networks is not supported.

• Not all curve types are supported.

• Grease Pencil is not fully supported.