Interaction - Interactive Web-Based Virtual Reality with Java 3D - page 162

for a mouse click. Lastly, the processStimulus() method is supplied for defining the action
to be taken when the event or condition is triggered. In this simple example with only one
triggering condition, no decoding is needed and the processStimulus() method simply in-
creases the value of the TransY variable to move the cube up by a certain amount vertically

Figure 2. Adding SimpleMouseBehavior.java

BG

objRoot

B

myMovementBehavior

TG

objMove

ColorCube

1. public BranchGroup createSceneGraph()

2. {

3. // Create the root of the branch graph

4. BranchGroup objRoot = new BranchGroup();

5. Transform3D translate = new Transform3D();

6.

7. translate.set(new Vector3f(0.0f,-0.3f,0.0f));

8.

9. TransformGroup objMove = new TransformGroup();

10. TransformGroup objTrans = new TransformGroup(translate);

11.
12. objMove.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);

13. objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);

14. objMove.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);

15.
16.

SimpleMouseMovement myMovementBehavior = new SimpleMouseMovement(objMove);

17. myMovementBehavior.setSchedulingBounds(new BoundingSphere());

18.
19. objRoot.addChild(objTrans);

20. objTrans.addChild(objMove);

21. objMove.addChild(new ColorCube(0.2));

22. objMove.addChild(myMovementBehavior);

23.
24. // Let Java 3D perform optimizations on this scene graph.

25. objRoot.compile();

26.
27. return objRoot;

28. }