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Known Limitations
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 camera
- 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
Alpha limitations
- 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 are read-only. These parameters are not yet supported.
- User defined attribute identifier id are not respected
- Light filters on light arrays are not yet supported
- New parallel Alembic_In_Prman not supported yet with Importomatic
- 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 render
- Display and Sample Filters not yet supported
- Lights in nested instances do not render
- Checkpoint + recovery not yet functional
- 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 supported
- Display "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 supported
- Katana 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.