1 files changed, 11 insertions, 0 deletions
diff --git a/source/blender/blenkernel/BKE_mesh.h b/source/blender/blenkernel/BKE_mesh.h
index 2b32c6a5420..72a1303fc6b 100644
--- a/source/blender/blenkernel/BKE_mesh.h
+++ b/source/blender/blenkernel/BKE_mesh.h
@@ -428,6 +428,17 @@ float (*BKE_mesh_vertex_normals_for_write(struct Mesh *mesh))[3];
 float (*BKE_mesh_poly_normals_for_write(struct Mesh *mesh))[3];
 
 /**
+ * Free any cached vertex or poly normals. Face corner (loop) normals are also derived data,
+ * but are not handled with the same method yet, so they are not included. It's important that this
+ * is called after the mesh changes size, since otherwise cached normal arrays might not be large
+ * enough (though it may be called indirectly by other functions).
+ *
+ * \note Normally it's preferred to call #BKE_mesh_normals_tag_dirty instead,
+ * but this can be used in specific situations to reset a mesh or reduce memory usage.
+ */
+void BKE_mesh_clear_derived_normals(struct Mesh *mesh);
+
+/**
  * Mark the mesh's vertex normals non-dirty, for when they are calculated or assigned manually.
  */
 void BKE_mesh_vertex_normals_clear_dirty(struct Mesh *mesh);