5edda6cbcc
USD: optionally author subdivision schema on export This PR adds support for exporting USD assets which have the subdivision schema applied. Current behavior prior to this PR is that the effects of Subdivision Surface modifiers are always applied to their mesh prior to export, such that it is not possible to recover the original base mesh. In this PR we provide three options for the subdiv schema type: Ignore - Export base mesh without subdivision with USD Scheme = None Tessellate - Export subdivided mesh with USD Scheme = None Best Match (default) - Export base mesh with USD Scheme = Catmull-Clark "Best Match" here means that Blender will set a subdiv scheme type in the exported USD asset when it is possible to closely match the subdivision surface type that was authored in Blender. At this time Blender provides two subdivision types: Catmull-Clark and Simple. Because Simple does not have a corresponding subdivision type in USD, we do not attempt to convert or represent it, and instead the Simple subdiv modifier will be evaluated and applied to the mesh during export. Whenever a Catmull-Clark Subdivision Surface modifier is applied to an object, and is the last modifier in the stack, it is possible to set the subdiv scheme to Catmull-Clark for the respective prim in the exported USD file. Authored by Apple: Matt McLin Co-authored-by: Matt McLin <mmclin@apple.com> Co-authored-by: Brecht Van Lommel <brecht@blender.org> Pull Request: https://projects.blender.org/blender/blender/pulls/113267
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