public void removeStepModifier(StepModifier<GraphicalNode> sm) {
steppedChangeableSupport.removeStepModifier(sm);
}
public void step(long deltaT, int width, int height) {
steppedChangeableSupport.step(deltaT, width, height);
}
public void removeAllStepModifiers() {
steppedChangeableSupport.removeAllStepModifiers();
}