Fix T76916: Cycles missing deform motion blur for shape key + subdiv modifier

1 files changed, 8 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/object.c b/source/blender/blenkernel/intern/object.c
index de34b0cba69..849b42ccb2c 100644
--- a/source/blender/blenkernel/intern/object.c
+++ b/source/blender/blenkernel/intern/object.c
@@ -3876,6 +3876,10 @@ bool BKE_object_is_child_recursive(const Object *ob_parent, const Object *ob_chi
  * cases false positives are hard to avoid (shape keys for example) */
 int BKE_object_is_modified(Scene *scene, Object *ob)
 {
+  /* Always test on original object since evaluated object may no longer
+   * have shape keys or modifiers that were used to evaluate it. */
+  ob = DEG_get_original_object(ob);
+
   int flag = 0;
 
   if (BKE_key_from_object(ob)) {
@@ -4006,6 +4010,10 @@ static bool modifiers_has_animation_check(const Object *ob)
  * and we can still if there was actual deformation afterwards */
 int BKE_object_is_deform_modified(Scene *scene, Object *ob)
 {
+  /* Always test on original object since evaluated object may no longer
+   * have shape keys or modifiers that were used to evaluate it. */
+  ob = DEG_get_original_object(ob);
+
   ModifierData *md;
   VirtualModifierData virtualModifierData;
   int flag = 0;