fix [#34098] Crash after using Decimate or Remesh modifiers

converting a derived mesh to a mesh didnt clear its selection history, which could be invalid after applying a modifier.

1 files changed, 7 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/DerivedMesh.c b/source/blender/blenkernel/intern/DerivedMesh.c
index 8ca6d045712..8e740075bc6 100644
--- a/source/blender/blenkernel/intern/DerivedMesh.c
+++ b/source/blender/blenkernel/intern/DerivedMesh.c
@@ -562,6 +562,13 @@ void DM_to_mesh(DerivedMesh *dm, Mesh *me, Object *ob)
 		tmp.key = NULL;
 	}
 
+	/* Clear selection history */
+	tmp.mselect = NULL;
+	tmp.totselect = 0;
+	if (me->mselect) {
+		MEM_freeN(me->mselect);
+	}
+
 	*me = tmp;
 }