COW Fix - Motion paths were not drawing as they weren't getting copied

3 files changed, 24 insertions, 1 deletions

diff --git a/source/blender/blenkernel/BKE_anim.h b/source/blender/blenkernel/BKE_anim.h
index 0fb83162459..701be9d44cc 100644
--- a/source/blender/blenkernel/BKE_anim.h
+++ b/source/blender/blenkernel/BKE_anim.h
@@ -48,6 +48,8 @@ struct Main;
 
 void animviz_settings_init(struct bAnimVizSettings *avs);
 
+struct bMotionPath *animviz_copy_motionpath(const struct bMotionPath *mpath_src);
+
 void animviz_free_motionpath_cache(struct bMotionPath *mpath);
 void animviz_free_motionpath(struct bMotionPath *mpath);
 
diff --git a/source/blender/blenkernel/intern/anim.c b/source/blender/blenkernel/intern/anim.c
index 674cf545ec6..8d420cd2d71 100644
--- a/source/blender/blenkernel/intern/anim.c
+++ b/source/blender/blenkernel/intern/anim.c
@@ -141,6 +141,27 @@ void animviz_free_motionpath(bMotionPath *mpath)
 
 /* ------------------- */
 
+/* Make a copy of motionpath data, so that viewing with copy on write works */
+bMotionPath *animviz_copy_motionpath(const bMotionPath *mpath_src)
+{
+	bMotionPath *mpath_dst;
+
+	if (mpath_src == NULL)
+		return NULL;
+
+	mpath_dst = MEM_dupallocN(mpath_src);
+	mpath_dst->points = MEM_dupallocN(mpath_src->points);
+
+	/* should get recreated on draw... */
+	mpath_dst->points_vbo = NULL;
+	mpath_dst->batch_line = NULL;
+	mpath_dst->batch_points = NULL;
+
+	return mpath_dst;
+}
+
+/* ------------------- */
+
 /**
  * Setup motion paths for the given data.
  * \note Only used when explicitly calculating paths on bones which may/may not be consider already
diff --git a/source/blender/blenkernel/intern/object.c b/source/blender/blenkernel/intern/object.c
index 8e50d1b32e1..bd004b9b6a8 100644
--- a/source/blender/blenkernel/intern/object.c
+++ b/source/blender/blenkernel/intern/object.c
@@ -1199,7 +1199,7 @@ void BKE_object_copy_data(Main *UNUSED(bmain), Object *ob_dst, const Object *ob_
 	BLI_listbase_clear(&ob_dst->drawdata);
 	BLI_listbase_clear(&ob_dst->pc_ids);
 
-	ob_dst->mpath = NULL;
+	ob_dst->mpath = animviz_copy_motionpath(ob_src->mpath);
 
 	copy_object_lod(ob_dst, ob_src, flag_subdata);