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.

• Monitor performance can lag behind edits for large scenes
• Volume edits will break the volume render.
• Adding a portal light to a dome light doesn't delete the dome light
• Cannot Live Render from Viewer cameraCannot 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

Alpha limitations

• 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.Some parameters in PrmanGlobalStatements and PrmanObjectStatements are read-only and appear greyed out.  These parameters are not yet supported.
• User defined attribute identifier id are not respectedLight filters on light arrays are not yet supported
• Prman's errorHandlers are not supported
• Dicing cameras do not work
• Deformation motion blur for blobbies and volumes not yet supported
• NURBS trim curves don't renderDisplay and Sample Filters not yet supported
• Lights in nested instances do not render
• Checkpoint + recovery not yet functional
• Texture Projections do not render correctly
• You can only render from the RenderSettings camera.
• Holdouts not available
• Baking not available
• Clipping planes not available
• Polygons with holes not supported
• Light filter linking not supported
• Live udpates to ROI and crop window not supportedDisplay "interactiveDisplayOptions" not supported
• Deep output type not supported
• Integer AOVs are not available in RenderOutputDefine
• Material assignment to archives do not function correctly in Alpha
• 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 supportedKatana 3.0 only: Volumes and blobbies not yet functional.
• Katana 3.0 only: Hydra Viewer light plugins not yet functional

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.