Just reuse vertices and indices if all regular

QTProject/subdivision.cpp

@@ -71,6 +71,9 @@ void Subdivision::subdivide(Mesh *mesh, int level) {
     input.vertex_buffer = entry->vertices;
     input.index_buffer = entry->indices;
 
+    if (input.index_buffer.isEmpty()) {
+        current_mesh->update(input.vb_handle, input.vertex_buffer, input.index_buffer, entry->indicesRegular);
+    } else {
         Tables tables = precomputeTables(input);
         Result result = runShader(input, tables);
 
@@ -86,8 +89,7 @@ void Subdivision::subdivide(Mesh *mesh, int level) {
         qDebug() << "patches" << patches.length();
 
         current_mesh->update(result.vb_handle, result.vertex_buffer, irregular, patches);
-
-    //return new Mesh(f, mesh, result.vertex_buffer, tables.index_buffer);
+    }
 }
 
 /**