private final Universe universe;
public BasicUniverse3D(Universe3DState state, Universe universe) {
this.state = state;
this.universe = universe;
this.synchronizer = new BasicSynchronizer3D(state.getSynchronizerState());
root = new BranchGroup();
root.setCapability(Group.ALLOW_CHILDREN_EXTEND);
elements3D = new HashSet<Node>();
}