Fix: Incorrect handling for crease layers

First, there can only be one crease layer, so remove the "default name",
since apparently that's how CustomData tests for that
(see `CustomData_layertype_is_singleton`).

Second, always propagate crease data because it can be used in arbitrary
situations by geometry nodes. That also has to be done for all generic
attribute layers.

Fixes T101340, T101373

1 files changed, 4 insertions, 3 deletions

diff --git a/source/blender/blenkernel/intern/object_update.c b/source/blender/blenkernel/intern/object_update.c
index 91170060fee..3fe8b95e656 100644
--- a/source/blender/blenkernel/intern/object_update.c
+++ b/source/blender/blenkernel/intern/object_update.c
@@ -141,9 +141,10 @@ void BKE_object_handle_data_update(Depsgraph *depsgraph, Scene *scene, Object *o
       CustomData_MeshMasks cddata_masks = scene->customdata_mask;
       CustomData_MeshMasks_update(&cddata_masks, &CD_MASK_BAREMESH);
       /* Custom attributes should not be removed automatically. They might be used by the render
-       * engine or scripts. They can still be removed explicitly using geometry nodes. */
-      cddata_masks.vmask |= CD_MASK_PROP_ALL;
-      cddata_masks.emask |= CD_MASK_PROP_ALL;
+       * engine or scripts. They can still be removed explicitly using geometry nodes.
+       * Crease can be be used in generic situations with geometry nodes as well. */
+      cddata_masks.vmask |= CD_MASK_PROP_ALL | CD_MASK_CREASE;
+      cddata_masks.emask |= CD_MASK_PROP_ALL | CD_MASK_CREASE;
       cddata_masks.fmask |= CD_MASK_PROP_ALL;
       cddata_masks.pmask |= CD_MASK_PROP_ALL;
       cddata_masks.lmask |= CD_MASK_PROP_ALL;