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.

2 files changed, 23 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
 
diff --git a/release/scripts/startup/bl_operators/anim.py b/release/scripts/startup/bl_operators/anim.py
index e34e9a981a6..943eed74b1d 100644
--- a/release/scripts/startup/bl_operators/anim.py
+++ b/release/scripts/startup/bl_operators/anim.py
@@ -195,6 +195,11 @@ class BakeAction(Operator):
             description="Remove all constraints from keyed object/bones, and do 'visual' keying",
             default=False,
             )
+    clear_parents = BoolProperty(
+            name="Clear Parents",
+            description="Bake animation onto the object then clear parents (objects only)",
+            default=False,
+            )
     bake_types = EnumProperty(
             name="Bake Data",
             description="Which data's transformations to bake",
@@ -216,6 +221,7 @@ class BakeAction(Operator):
                                         do_pose='POSE' in self.bake_types,
                                         do_object='OBJECT' in self.bake_types,
                                         do_constraint_clear=self.clear_constraints,
+                                        do_parents_clear=self.clear_parents,
                                         do_clean=True,
                                         )