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, 16 insertions, 0 deletions

diff --git a/source/blender/io/common/intern/abstract_hierarchy_iterator.cc b/source/blender/io/common/intern/abstract_hierarchy_iterator.cc
index 8e66c069e18..fbefc8c8e7e 100644
--- a/source/blender/io/common/intern/abstract_hierarchy_iterator.cc
+++ b/source/blender/io/common/intern/abstract_hierarchy_iterator.cc
@@ -39,6 +39,7 @@
 #include "DNA_modifier_types.h"
 #include "DNA_object_types.h"
 #include "DNA_particle_types.h"
+#include "DNA_rigidbody_types.h"
 
 #include "DEG_depsgraph_query.h"
 
@@ -127,6 +128,9 @@ bool AbstractHierarchyWriter::check_is_animated(const HierarchyContext &context)
   if (BKE_key_from_object(object) != nullptr) {
     return true;
   }
+  if (check_has_deforming_physics(context)) {
+    return true;
+  }
 
   /* Test modifiers. */
   /* TODO(Sybren): replace this with a check on the depsgraph to properly check for dependency on
@@ -142,6 +146,18 @@ bool AbstractHierarchyWriter::check_is_animated(const HierarchyContext &context)
   return false;
 }
 
+bool AbstractHierarchyWriter::check_has_physics(const HierarchyContext &context)
+{
+  const RigidBodyOb *rbo = context.object->rigidbody_object;
+  return rbo != nullptr && rbo->type == RBO_TYPE_ACTIVE;
+}
+
+bool AbstractHierarchyWriter::check_has_deforming_physics(const HierarchyContext &context)
+{
+  const RigidBodyOb *rbo = context.object->rigidbody_object;
+  return rbo != nullptr && rbo->type == RBO_TYPE_ACTIVE && (rbo->flag & RBO_FLAG_USE_DEFORM) != 0;
+}
+
 AbstractHierarchyIterator::AbstractHierarchyIterator(Depsgraph *depsgraph)
     : depsgraph_(depsgraph), writers_(), export_subset_({true, true})
 {