anchor.diff:          print("    normCoord = ${normCoord}");
         }
   
  -      print("  parts = ${_partTable.length}");
  +      print("  parts = ${_partTable.length} [after removal of $deleteCount empty part(s)]");
       }
   
       if (debugPrintParts) {
  
positive.code:     copy.forEach(_partTable.remove);
      print("DEBUG got result");
      */
    }
  
    Obj.fromString(String url, String str, {bool printStats: false,
  
negative.code:   List<int> indices = new List<int>();
    String mtllib;
  
    int trimTable(String url) {
      // remove empty objects from _partTable
      /*
      List<String> emptyList = new List<String>(); // create a copy to avoid concurrent modifications
  