1 files changed, 28 insertions, 0 deletions
diff --git a/source/blender/io/usd/intern/abstract_hierarchy_iterator.cc b/source/blender/io/usd/intern/abstract_hierarchy_iterator.cc
index a958a445a3d..50f81c2ffb1 100644
--- a/source/blender/io/usd/intern/abstract_hierarchy_iterator.cc
+++ b/source/blender/io/usd/intern/abstract_hierarchy_iterator.cc
@@ -25,6 +25,8 @@
 
 extern "C" {
 #include "BKE_anim.h"
+#include "BKE_animsys.h"
+#include "BKE_key.h"
 #include "BKE_particle.h"
 
 #include "BLI_assert.h"
@@ -33,6 +35,7 @@ extern "C" {
 
 #include "DNA_ID.h"
 #include "DNA_layer_types.h"
+#include "DNA_modifier_types.h"
 #include "DNA_object_types.h"
 #include "DNA_particle_types.h"
 
@@ -76,6 +79,31 @@ AbstractHierarchyWriter::~AbstractHierarchyWriter()
 {
 }
 
+bool AbstractHierarchyWriter::check_is_animated(const HierarchyContext &context) const
+{
+  const Object *object = context.object;
+
+  if (BKE_animdata_id_is_animated(static_cast<ID *>(object->data))) {
+    return true;
+  }
+  if (BKE_key_from_object(object) != nullptr) {
+    return true;
+  }
+
+  /* Test modifiers. */
+  /* TODO(Sybren): replace this with a check on the depsgraph to properly check for dependency on
+   * time. */
+  ModifierData *md = static_cast<ModifierData *>(object->modifiers.first);
+  while (md) {
+    if (md->type != eModifierType_Subsurf) {
+      return true;
+    }
+    md = md->next;
+  }
+
+  return false;
+}
+
 AbstractHierarchyIterator::AbstractHierarchyIterator(Depsgraph *depsgraph)
     : depsgraph_(depsgraph), writers_()
 {