// Create a new Behavior object that will perform the collision
        // detection on the specified object, and add it into
        // the scene graph.
        CollisionDetector cd = new CollisionDetector(przedmiot);
        BoundingSphere boundy = new BoundingSphere(new Point3d(0.0, 0.0, 0.0),
            1.0);
        cd.setSchedulingBounds(boundy);

  class CollisionDetector extends Behavior {
  private final Color3f highlightColor = new Color3f(0.0f, 1.0f, 0.0f);

  private final ColoringAttributes highlight = new ColoringAttributes(
      highlightColor, ColoringAttributes.SHADE_GOURAUD);

  final private Sphere sferka;
  final private ColoringAttributes shapeColoring;
  final private Appearance shapeAppearance;
  private WakeupOnCollisionEntry wEnter;
  private WakeupOnCollisionExit wExit;

  public CollisionDetector(Sphere s) {
    sferka = s;
    shapeAppearance = sferka.getAppearance();
    shapeColoring = shapeAppearance.getColoringAttributes();
    inCollision = false;
  }

  @Override
  public void initialize() {
    wEnter = new WakeupOnCollisionEntry(sferka);
    wExit = new WakeupOnCollisionExit(sferka);
    wakeupOn(wEnter);
  }

  @Override
  public void processStimulus(Enumeration criteria) {
    inCollision = !inCollision;

    if (inCollision) {
      shapeAppearance.setColoringAttributes(highlight);
      wakeupOn(wExit);
    } else {
      shapeAppearance.setColoringAttributes(shapeColoring);
      wakeupOn(wEnter);
    }
  }
  }