Optimize Skeleton Roots

Key: optimizeSkelRoots

This operation will merge all meshes for meshes attached to a skeleton. This can greatly improve character playback speed by optimizing scenes for GPU skinning computation.

This is a good option to try if you have rigged characters that use UsdGeomSkel. It will merge all meshes on the skeleton into a single mesh. Similar to merge static meshes, this will not significantly reduce memory usage.