07342407d3
Adds a Point Instancing exporter based on the existing USDPointInstancerReader. Covers both round-trip and Blender-native workflows. Exports 'Instance on Points' setups as USDGeomPointInstancer, supporting objects, collections, and nested prototypes. A warning is shown during export if invalid prototype references are detected. These would occur if an instancer attempts to instance itself. This feature is currently gated behind an off-by-default export option (`use_instancing`) as there are still a few cases which can yield incorrect results. Further details in the PR. Ref: #139758 Authored by Apple: Zili (Liz) Zhou Pull Request: https://projects.blender.org/blender/blender/pulls/139760
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