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Welcome to RenderMan for Maya (RfM) 21.2!

Welcome to RfM 21.2 This release introduces improvements and some fixes to the previous release.

The RenderMan preferences now include a preference for the number of prman threads to use for swatch renders.

When 'it' opens a file with a large ply, the channels are split into a main image and AOVs as sub-elements under that. 'it' looks for R, G, B & A for the main image and groups the remaining channels by name into each AOV.
The list of optional attrs now includes the new Prman attributes: reflectexcludesubset, shadowexcludesubset, transmitexcludesubet.
Maya File (texture) pattern now defaults lerp to ON
The Preset Browser has been improved to work with more types of shader networks.

Fixed a bug which could lead to Maya hanging, for example, if 'it' was launched from the shelf while swatch renders were underway.
Maya's volumeFog shader is now translated correctly as a PxrVolume.
Fixed a bug that prevented the RenderMan Attributes Window from opening in Maya 2015.
Fixed a bug where attrs of PxrSurface that were driven by Maya expressions weren't updating during batch renders.
Fixed a bug where animated parameters on pattern nodes failed to update properly when Maya's Evaluation Mode preference was set to Parallel.
Fixed a bug where imagePlane nodes would still render when the Display Mode was set to None. Now this works as expected.
Fixed a bug where referenced maya scenes containing PxrLayer nodes would cause warnings and fail to render correctly.
LocalQueue would not run on macOS if there was a local install of Qt4
A number of AOV bugs related to renaming and LPEs were fixed in RfM.
Preset Browser: materials using PxrLayerSurface were rendering grey.
Preset Browser: float to manifold conversions were not correctly handled.
Preset Browser: Maya's ramp node wasn't correctly parsed.

Modifying light visibility while in IPR mode does not change light visibility
Maya fluids will currently only render if you add RenderMan volume controls. Select the fluid shape and in the AE, do Attributes->RenderMan->Add Volume Controls
Creating a mesh light during IPR will retain the old geometry (non-mesh light). A refreshed IPR session will remove the old geometry.
Prior versions of RenderMan for Maya are not compatible with RenderMan 21.0. Trying to load the version 20.0 plugin with RenderMan Pro Server 21 installed will cause the following warnings: "rfm Warning: skipping unknown Slim keyword: requires" when loaded. The 20.X plugin will not function correctly.
Deselecting "Receive Shadows" does not work.