• Added motion blurred FOV capabilities and a detail modifier to the PxrCamera plugin
• Camera options such as depth of field and FOV must be specified through a projection plugin.
• Alpha and RGBA color sets are now supported. RGBA color sets are emitted as "color colorSetName" and "float colorSetNameA" to allow for ease of shader binding.
• Increased default precision for RIB export to 9
• Added Attribute "displacementbound" "int offscreen", please see the Primitive Variables section for an explanation
• Improved adaptive sampling when using checkpointing
• JIT compilation of OSL shaders now executes in parallel
• Added support for interactive arbitrary clipping planes
• Volume instancing is fully supported, however, density (and motion blur) cannot be altered per instance.
• Removed the PxrRollingShutter plugin, the functionality exists in PxrCamera
• PxrHairColor allows for either rec709/sRGB or ACEScg for Physical Mode
• Improved texture filtering results, we improved mipmapping level selection at grazing angles.
• Crop windows are no longer limited to the (0,0) to (1,1) square. Going outside the unit square will add overscan
• Cryptomattes now respect the crop window rather than adding black padding. Now they are always autocropped which may reduce size further.
• Cryptomatte now defaults to scanline EXR (ZIPS) output. This improves performance in Nuke at the cost of larger files.
• PxrCryptomatte now supports checkpointing
• Improved transparency handling in PxrCryptomatte
• Improvements in point rendering, more speed and less memory usage reported in many scenes. Note point mesh lights are not supported and points cannot be used as closed volumes
• Improved shadow tracing performance, especially on scenes where lights may not contribute to a point being shaded
• Alembic geometry is treated as instances when "-instanced" flag is specified
• Better handling of OpenVDB containers with zero density
• PxrSurface can now report its IOR when using nested dielectrics, removing the need for users to manually specify the attribute. The attribute is deprecated.
• Bump Adjust Amount is now defaulted to 1 (it was 0) to remove possible artifacts preemptively when a normal is below the horizon
• Bump mapping has been improved to avoid light leaking
• The exrinfo utility now automatically truncates the display of very long strings from the image header.  Use its new -full option to show these in full without truncation
• The "-d type" command line option now overrides the display type for all displays, not just the primary one
• Improved the calibration of timing statistics on Linux
• Methods in the the RixRNG.h header have been changed to be more typesafe
• Various fixes to volume rendering in 22 will result in different looks in volume rendering from pervious versions, they may appear (much) brighter depending on lighting circumstance.
• Added a new Primvar for points, falloffpower, float. I f not supplied, or set to zero, the points will have a hard edge. A value of 1 is a "reasonable" value that emulates the usual cosine based falloff; this will likely be the goto value for most people doing volumetric particle effects. Values between 0 and 1 makes the falloff faster, eroding the point faster - point has "less presence". Values higher than 1 (up to infinity) makes the falloff slower to the point of being non-existent.

Known Rendering Differences

• Hair will have more contrast between lit and unlit areas as an incorrect highlight was corrected in 22

Known Limitations

Interactive/Live Rendering Limitations

• Crop window edits are restricted to fall inside the original crop window
• Bucket order or size cannot be changed during live rendering
• min and max samples settings cannot be altered 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
• Displacement does not update on changes
• Objects are not re-diced during interactive sessions
• Mesh lights cannot be interchanged as geometry without restart.

RenderMan Pro Server

• 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.
• PxrUPBP is no longer supported
• 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.

• 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.

  The Centos KDE style "Oxygen" installs a version of Qt and sets the user's environment variable QT_PLUGIN_PATH forcing "it" and LocalQueue to attempt to load an incompatible Qt library. Either avoid installing the Oxygen theme or unset QT_PLUGIN_PATH before running "it" or LocalQueue. Other KDE styles may also install this theme.