Fix T79263: Alembic, exported rigid body animation not moving

The root cause was that `BKE_object_moves_in_time()` incorrectly returns
`false` when an object is moved by the physics system.

This also fixes the same issue in the USD exporter.

1 files changed, 7 insertions, 0 deletions

diff --git a/source/blender/io/common/IO_abstract_hierarchy_iterator.h b/source/blender/io/common/IO_abstract_hierarchy_iterator.h
index a274847e109..d289d86b397 100644
--- a/source/blender/io/common/IO_abstract_hierarchy_iterator.h
+++ b/source/blender/io/common/IO_abstract_hierarchy_iterator.h
@@ -129,7 +129,14 @@ class AbstractHierarchyWriter {
   // but wasn't used while exporting the current frame (for example, a particle-instanced mesh of
   // which the particle is no longer alive).
  protected:
+  /* Return true if the data written by this writer changes over time.
+   * Note that this function assumes this is an object data writer. Transform writers should not
+   * call this but implement their own logic. */
   virtual bool check_is_animated(const HierarchyContext &context) const;
+
+  /* Helper functions for animation checks. */
+  static bool check_has_physics(const HierarchyContext &context);
+  static bool check_has_deforming_physics(const HierarchyContext &context);
 };
 
 /* Determines which subset of the writers actually gets to write. */