Data Transfer: Add an option to 'auto-transform' destination mesh so that it matches best the source one.

This allows to match and transfer data between two meshes with similar shape but complete arbitrary different transform.

Note that the result will be best if the meshes (more precisely, their vertices) are exact copies of each other.
Otherwise, method used can only perform an approximated best match, which means you'll likely get better
results if you 'visually' make them match in 3D space (and use 'Object Transform') instead.

1 files changed, 21 insertions, 6 deletions

diff --git a/source/blender/blenkernel/intern/data_transfer.c b/source/blender/blenkernel/intern/data_transfer.c
index da00aecf9c0..53b6f4a1019 100644
--- a/source/blender/blenkernel/intern/data_transfer.c
+++ b/source/blender/blenkernel/intern/data_transfer.c
@@ -1064,8 +1064,8 @@ void BKE_object_data_transfer_layout(
 bool BKE_object_data_transfer_dm(
         Scene *scene, Object *ob_src, Object *ob_dst, DerivedMesh *dm_dst, const int data_types, bool use_create,
         const int map_vert_mode, const int map_edge_mode, const int map_loop_mode, const int map_poly_mode,
-        SpaceTransform *space_transform, const float max_distance, const float ray_radius,
-        const float islands_handling_precision,
+        SpaceTransform *space_transform, const bool auto_transform,
+        const float max_distance, const float ray_radius, const float islands_handling_precision,
         const int fromlayers_select[DT_MULTILAYER_INDEX_MAX], const int tolayers_select[DT_MULTILAYER_INDEX_MAX],
         const int mix_mode, const float mix_factor, const char *vgroup_name, const bool invert_vgroup,
         ReportList *reports)
@@ -1076,6 +1076,8 @@ bool BKE_object_data_transfer_dm(
 #define PDATA 3
 #define DATAMAX 4
 
+	SpaceTransform auto_space_transform;
+
 	DerivedMesh *dm_src;
 	Mesh *me_dst, *me_src;
 	bool dirty_nors_dst = true;  /* Assumed always true if not using a dm as destination. */
@@ -1126,6 +1128,17 @@ bool BKE_object_data_transfer_dm(
 		return changed;
 	}
 
+	if (auto_transform) {
+		MVert *verts_dst = dm_dst ? dm_dst->getVertArray(dm_dst) : me_dst->mvert;
+		const int num_verts_dst = dm_dst ? dm_dst->getNumVerts(dm_dst) : me_dst->totvert;
+
+		if (space_transform == NULL) {
+			space_transform = &auto_space_transform;
+		}
+
+		BKE_mesh_remap_find_best_match_from_dm(verts_dst, num_verts_dst, dm_src, space_transform);
+	}
+
 	/* Check all possible data types.
 	 * Note item mappings and dest mix weights are cached. */
 	for (i = 0; i < DT_TYPE_MAX; i++) {
@@ -1388,15 +1401,17 @@ bool BKE_object_data_transfer_dm(
 bool BKE_object_data_transfer_mesh(
         Scene *scene, Object *ob_src, Object *ob_dst, const int data_types, const bool use_create,
         const int map_vert_mode, const int map_edge_mode, const int map_loop_mode, const int map_poly_mode,
-        SpaceTransform *space_transform, const float max_distance, const float ray_radius,
-        const float islands_handling_precision,
+        SpaceTransform *space_transform, const bool auto_transform,
+        const float max_distance, const float ray_radius, const float islands_handling_precision,
         const int fromlayers_select[DT_MULTILAYER_INDEX_MAX], const int tolayers_select[DT_MULTILAYER_INDEX_MAX],
         const int mix_mode, const float mix_factor, const char *vgroup_name, const bool invert_vgroup,
         ReportList *reports)
 {
 	return BKE_object_data_transfer_dm(
 	        scene, ob_src, ob_dst, NULL, data_types, use_create,
-	        map_vert_mode, map_edge_mode, map_loop_mode, map_poly_mode, space_transform,
-	        max_distance, ray_radius, islands_handling_precision, fromlayers_select, tolayers_select,
+	        map_vert_mode, map_edge_mode, map_loop_mode, map_poly_mode,
+	        space_transform, auto_transform,
+	        max_distance, ray_radius, islands_handling_precision,
+	        fromlayers_select, tolayers_select,
 	        mix_mode, mix_factor, vgroup_name, invert_vgroup, reports);
 }