fix [#34805] Bake action ignores parent motion

in fact this is more feature request.
add an option to bake a parented objects animation, then clear the parent and apply the action.

1 files changed, 17 insertions, 2 deletions

diff --git a/release/scripts/modules/bpy_extras/anim_utils.py b/release/scripts/modules/bpy_extras/anim_utils.py
index de702b53978..c9ed91d3a83 100644
--- a/release/scripts/modules/bpy_extras/anim_utils.py
+++ b/release/scripts/modules/bpy_extras/anim_utils.py
@@ -32,6 +32,7 @@ def bake_action(frame_start,
                 do_pose=True,
                 do_object=True,
                 do_constraint_clear=False,
+                do_parents_clear=False,
                 do_clean=False,
                 action=None,
                 ):
@@ -54,6 +55,8 @@ def bake_action(frame_start,
     :type do_object: bool
     :arg do_constraint_clear: Remove constraints (and do 'visual keying').
     :type do_constraint_clear: bool
+    :arg do_parents_clear: Unparent after baking objects.
+    :type do_parents_clear: bool
     :arg do_clean: Remove redundant keyframes after baking.
     :type do_clean: bool
     :arg action: An action to bake the data into, or None for a new action
@@ -77,8 +80,17 @@ def bake_action(frame_start,
                 matrix[name] = pbone.matrix_basis.copy()
         return matrix
 
-    def obj_frame_info(obj, do_visual_keying):
-        return obj.matrix_local.copy() if do_visual_keying else obj.matrix_basis.copy()
+    if do_parents_clear:
+        def obj_frame_info(obj, do_visual_keying):
+            parent = obj.parent
+            matrix = obj.matrix_local if do_visual_keying else obj.matrix_basis
+            if parent:
+                return parent.matrix_world * matrix
+            else:
+                return matrix.copy()
+    else:
+        def obj_frame_info(obj, do_visual_keying):
+            return obj.matrix_local.copy() if do_visual_keying else obj.matrix_basis.copy()
 
     # -------------------------------------------------------------------------
     # Setup the Context
@@ -192,6 +204,9 @@ def bake_action(frame_start,
 
             obj.keyframe_insert("scale", -1, f, name, options)
 
+        if do_parents_clear:
+            obj.parent = None
+
     # -------------------------------------------------------------------------
     # Clean