2523958e0e
The existing point instancer reader is slightly refactored to allow for animated setups. The primary change is simply to inherit from `USDGeomReader` rather than `USDXformReader`. This allows access to the `read_geometry` API used by the cache modifier. The existing `read_object_data` method is split into two parts with `read_geometry` loading per-frame USD data and `read_object_data` coordinating the initial loading process, including creating the GN node tree just once. A new test has been added (a variation of the nested point instancer file) with time samples on various attributes and on both point instancers. This also fixes #129502 and the file provided in that issue. ---- The already added test file is `tests/data/usd/usd_point_instancer_anim.usda` Pull Request: https://projects.blender.org/blender/blender/pulls/129881
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