Fix Data Transfer Projected Face/Edge Interpolated mode is wrong

Caused by {rBcfa53e0fbeed}

Above commit mixed up source and destination meshes causing bad lookups
on calculated normals.

Now make sure we get normals from our destination mesh to project along.

Note this was only reported for Projected Face Interpolated mode, but
same was true for Projected Edge Interpolated mode (though that one is a
bit weird to test since I think there is generally something wrong with
that mode -- with or without rBcfa53e0fbeed).

Fixes T97528

Maniphest Tasks: T97528

Differential Revision: https://developer.blender.org/D14726

3 files changed, 9 insertions, 3 deletions

diff --git a/source/blender/blenkernel/BKE_mesh_remap.h b/source/blender/blenkernel/BKE_mesh_remap.h
index 395fc5c7eba..e2b16a7681d 100644
--- a/source/blender/blenkernel/BKE_mesh_remap.h
+++ b/source/blender/blenkernel/BKE_mesh_remap.h
@@ -178,6 +178,7 @@ void BKE_mesh_remap_calc_verts_from_mesh(int mode,
                                          int numverts_dst,
                                          bool dirty_nors_dst,
                                          struct Mesh *me_src,
+                                         struct Mesh *me_dst,
                                          MeshPairRemap *r_map);
 
 void BKE_mesh_remap_calc_edges_from_mesh(int mode,
@@ -190,6 +191,7 @@ void BKE_mesh_remap_calc_edges_from_mesh(int mode,
                                          int numedges_dst,
                                          bool dirty_nors_dst,
                                          struct Mesh *me_src,
+                                         struct Mesh *me_dst,
                                          MeshPairRemap *r_map);
 
 void BKE_mesh_remap_calc_loops_from_mesh(int mode,
diff --git a/source/blender/blenkernel/intern/data_transfer.c b/source/blender/blenkernel/intern/data_transfer.c
index f1365256fed..6a3f6a47f5e 100644
--- a/source/blender/blenkernel/intern/data_transfer.c
+++ b/source/blender/blenkernel/intern/data_transfer.c
@@ -1501,6 +1501,7 @@ bool BKE_object_data_transfer_ex(struct Depsgraph *depsgraph,
                                             num_verts_dst,
                                             dirty_nors_dst,
                                             me_src,
+                                            me_dst,
                                             &geom_map[VDATA]);
         geom_map_init[VDATA] = true;
       }
@@ -1579,6 +1580,7 @@ bool BKE_object_data_transfer_ex(struct Depsgraph *depsgraph,
                                             num_edges_dst,
                                             dirty_nors_dst,
                                             me_src,
+                                            me_dst,
                                             &geom_map[EDATA]);
         geom_map_init[EDATA] = true;
       }
diff --git a/source/blender/blenkernel/intern/mesh_remap.c b/source/blender/blenkernel/intern/mesh_remap.c
index 2e634a14872..3a37c29c1d0 100644
--- a/source/blender/blenkernel/intern/mesh_remap.c
+++ b/source/blender/blenkernel/intern/mesh_remap.c
@@ -478,6 +478,7 @@ void BKE_mesh_remap_calc_verts_from_mesh(const int mode,
                                          const int numverts_dst,
                                          const bool UNUSED(dirty_nors_dst),
                                          Mesh *me_src,
+                                         Mesh *me_dst,
                                          MeshPairRemap *r_map)
 {
   const float full_weight = 1.0f;
@@ -580,7 +581,7 @@ void BKE_mesh_remap_calc_verts_from_mesh(const int mode,
       MPoly *polys_src = me_src->mpoly;
       MLoop *loops_src = me_src->mloop;
       float(*vcos_src)[3] = BKE_mesh_vert_coords_alloc(me_src, NULL);
-      const float(*vert_normals_src)[3] = BKE_mesh_vertex_normals_ensure(me_src);
+      const float(*vert_normals_dst)[3] = BKE_mesh_vertex_normals_ensure(me_dst);
 
       size_t tmp_buff_size = MREMAP_DEFAULT_BUFSIZE;
       float(*vcos)[3] = MEM_mallocN(sizeof(*vcos) * tmp_buff_size, __func__);
@@ -592,7 +593,7 @@ void BKE_mesh_remap_calc_verts_from_mesh(const int mode,
       if (mode == MREMAP_MODE_VERT_POLYINTERP_VNORPROJ) {
         for (i = 0; i < numverts_dst; i++) {
           copy_v3_v3(tmp_co, verts_dst[i].co);
-          copy_v3_v3(tmp_no, vert_normals_src[i]);
+          copy_v3_v3(tmp_no, vert_normals_dst[i]);
 
           /* Convert the vertex to tree coordinates, if needed. */
           if (space_transform) {
@@ -703,6 +704,7 @@ void BKE_mesh_remap_calc_edges_from_mesh(const int mode,
                                          const int numedges_dst,
                                          const bool UNUSED(dirty_nors_dst),
                                          Mesh *me_src,
+                                         Mesh *me_dst,
                                          MeshPairRemap *r_map)
 {
   const float full_weight = 1.0f;
@@ -938,7 +940,7 @@ void BKE_mesh_remap_calc_edges_from_mesh(const int mode,
 
       BKE_bvhtree_from_mesh_get(&treedata, me_src, BVHTREE_FROM_EDGES, 2);
 
-      const float(*vert_normals_dst)[3] = BKE_mesh_vertex_normals_ensure(me_src);
+      const float(*vert_normals_dst)[3] = BKE_mesh_vertex_normals_ensure(me_dst);
 
       for (i = 0; i < numedges_dst; i++) {
         /* For each dst edge, we sample some rays from it (interpolated from its vertices)