Commits on Jan 18, 2024

1. Fix a potential crash when updating skinned primitives. …

   With 6b3afc2, skinned primitives are now replaced by an entry with
   no type and no data source instead of being removed, since they have
   child prims (the skinning computation Sprims).
   When doing so, the entry's cache of computed primvars was never cleared.
   
   This could result in a crash in scenarios such as switching to
   displaying the result of a BakeSkinning operation. In this case, the
   skinned primitive changes type from e.g. a Mesh (with a computed primvar
   for the skinned positions) to empty, and then back to Mesh (which should
   have no computed primvars). Since the entry's primvar cache was never cleared,
   this incorrectly returns a stale list of computed primvars for the
   updated mesh which later produces a crash.
   
   When the prim type of an existing entry is being changed, the cached
   primvars are now also cleared out while removing the old prim from the
   render index.
   
   Bug: PixarAnimationStudios#2809

   

   cameronwhite committed Jan 18, 2024
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