Miscellaneous Changes

• Materials set at instance source locations are ignored

• Dicing cameras are now specified as a camera's scenegraph location. The "worldcamera" and "framecamera" options are no longer supported. This also removes the need to add the dicing camera to a RenderOutputDefine to use the full camera path.

• PxrSphereLights with cone angles are now facing the correct direction
• Instance primvars are no longer supported.  Use user attributes instead.
• Leaf level instancing now requires that locations with the instance.ID attribute have no children.  RfK will not traverse past a location with instance.ID set.
• RIB Include has been removed
• Integrator settings are now configured with a new node called PrmanIntegratorSettings. This node automatically picks up any integrators with Args files on RMAN_RIXPLUGINPATH.
• "insertWhen" directives for config.xml are removed pending new configuration
• Parameter Layout has been removed from PrmanGlobalStatements and PrmanObjectStatements
• Attributes in PrmanObjectStatements are now split into either an "attributes" or "primvars" group depending on whether the attribute can vary per instance.
• There have been a few changes related to cameras and PrmanGlobalStatements: -
  
  • dofAspect was a hider setting, but is now found under prmanGlobalStatements.camera.depthOfField.dofAspect.
  • Projection plugins can be created as materials assigned to /root. They are no longer available through PGS.
  • backgroundColor can be created as a "PxrBackgroundDisplayFilter" assigned to /root. It is no longer available in PGS.
  • The settings in the camera motionBlur section have changed and could not be automatically remapped.
  • It is no longer necessary to create a camera with frameBeginCameraPath. All cameras in the scene will be created.
• No longer supported:
  • "prmanGlobalSettings.plugin.instanceSourceMode"
  • "prmanGlobalSettings.commandArguments.numThreadModeProcs"
  • "textures" attribute group
  • The PrmanLightFilterCreate macro has been removed in favor of light filters in GafferThree
  • camera fov motion blur
    
    

Live Rendering

• Updates to attributes will cause interactive motion blur to fail to render. The render must be restarted.

• Creating a mesh light from existing geometry will duplicate the geometry in-render. Restart the render to remove the duplicate.

• Adding a portal light to a dome light doesn't delete the dome light
• Cannot change a geometry primitive type during live rendering (e.g. from NURBS to polymesh)
• When traversal is parallel, edits to a live material will affect only a subset of assigned geometry unless all of the assigned geometry starts out live or is made live at least once during the live render session
• Edits to mesh light parameters require that the geometry location is enabled in the live render working set
• When assigning a material to a Scene Graph location, that location must be enabled in the live render working set

Beta limitations

• XML stats do not function in RfK
• Scenes with locations with a ":" in the name (imported from Maya with namespaces) will crash in the Hydra Viewer available in Katana 3.0
• Some parameters in PrmanGlobalStatements and PrmanObjectStatements are read-only.  These parameters are not yet supported.
• If the environment variable RMAN_SHADERPATH or RMAN_RIXPLUGINPATH is set and doesn't include the default paths from RMANTREE then the default prman shaders are not found.
• User defined attribute identifier id are not respected
• Prman's errorHandlers are not supported
• NURBS trim curves don't render
• Texture Projections do not render correctly
• You can only render from the RenderSettings camera.
• Holdouts not available
• Clipping planes not available
• Integer AOVs are not available in RenderOutputDefine
• Material assignment to archives may not function correctly
• Alembic pass-through via AlembicIn_prman and Alembic proxy support in Viewer
• Env var for DSO Procedurals
• Instanced lights with parented filters using the "Light Filter" coordsys have incorrect transform
• Material matrix parameters of type double are not supported
• Material matrix array parameters are not supported
• Attribute "geometry.flip_t" is not currently supported
• Katana 3.0 only: Hydra Viewer light plugins not yet functional in Windows (Linux operation has been added to 22.0b5)

Katana Limitation

• When a Prune node is added at the end of the node graph, right above the Render node, we do not receive an edit from Katana. If a no-op node (e.g. Merge) is inserted above the Render node and the Prune is added above that then the delete edit is received and the Prune works properly.
• There are a few live render limitations in Katana 2.6 that have been resolved in Katana 3.0.