Fix: Clear mesh runtime cache when adding elements

Currently the RNA functions to add mesh elements like vertices
don't clear the runtime cache of things like triangulation, BVH
trees, etc. This is important, since they might be accessed with
incorrect sizes. This is split from a fix for T95839.

1 files changed, 9 insertions, 0 deletions

diff --git a/source/blender/editors/mesh/mesh_data.c b/source/blender/editors/mesh/mesh_data.c
index 0f58752f323..7a089d7101e 100644
--- a/source/blender/editors/mesh/mesh_data.c
+++ b/source/blender/editors/mesh/mesh_data.c
@@ -37,6 +37,7 @@
 #include "BKE_customdata.h"
 #include "BKE_editmesh.h"
 #include "BKE_mesh.h"
+#include "BKE_mesh_runtime.h"
 #include "BKE_report.h"
 
 #include "DEG_depsgraph.h"
@@ -1126,6 +1127,8 @@ static void mesh_add_verts(Mesh *mesh, int len)
   mesh->vdata = vdata;
   BKE_mesh_update_customdata_pointers(mesh, false);
 
+  BKE_mesh_runtime_clear_cache(mesh);
+
   /* scan the input list and insert the new vertices */
 
   /* set default flags */
@@ -1162,6 +1165,8 @@ static void mesh_add_edges(Mesh *mesh, int len)
   mesh->edata = edata;
   BKE_mesh_update_customdata_pointers(mesh, false); /* new edges don't change tessellation */
 
+  BKE_mesh_runtime_clear_cache(mesh);
+
   /* set default flags */
   medge = &mesh->medge[mesh->totedge];
   for (i = 0; i < len; i++, medge++) {
@@ -1190,6 +1195,8 @@ static void mesh_add_loops(Mesh *mesh, int len)
     CustomData_add_layer(&ldata, CD_MLOOP, CD_CALLOC, NULL, totloop);
   }
 
+  BKE_mesh_runtime_clear_cache(mesh);
+
   CustomData_free(&mesh->ldata, mesh->totloop);
   mesh->ldata = ldata;
   BKE_mesh_update_customdata_pointers(mesh, true);
@@ -1221,6 +1228,8 @@ static void mesh_add_polys(Mesh *mesh, int len)
   mesh->pdata = pdata;
   BKE_mesh_update_customdata_pointers(mesh, true);
 
+  BKE_mesh_runtime_clear_cache(mesh);
+
   /* set default flags */
   mpoly = &mesh->mpoly[mesh->totpoly];
   for (i = 0; i < len; i++, mpoly++) {