int _groupId; // id generator for group objects
int _nbSubShapes; // initial nb of subshapes in the shape to mesh
bool _isShapeToMesh;// set to true when a shape is given (only once)
int _groupId; // id generator for group objects
int _nbSubShapes; // initial nb of subshapes in the shape to mesh
bool _isShapeToMesh;// set to true when a shape is given (only once)