Audio - Interactive Web-Based Virtual Reality with Java 3D - page 270

Figure 4. Code segment and screen capture for MultiViewApp.java

1. public TransformGroup createViewPlatform(Canvas3D canvas3D, int mode)

2. {

3. Transform3D transform3D = vpTransform3D(mode);

4. ViewPlatform viewPlatform = new ViewPlatform();

5. viewPlatform.setActivationRadius(10.0f);

6. TransformGroup objTransform = new TransformGroup(transform3D);

7. objTransform.addChild(viewPlatform);

8.

9. // call method in PointSoundScape; add a colored cube and a footsteps PointSound as avatar

10. if (mode == 0) myWorld.addAvatar(objTransform);

11.
12. View view = new View();

13. view.attachViewPlatform(viewPlatform);

14. view.addCanvas3D(canvas3D);

15. view.setPhysicalBody(new PhysicalBody());

16. PhysicalEnvironment physicalEnvironment = new PhysicalEnvironment();

17. view.setPhysicalEnvironment(physicalEnvironment);

18.
19. if(mode == 0) { // Initializes sound

20. JavaSoundMixer javaSoundMixer = new JavaSoundMixer(physicalEnvironment);

21. javaSoundMixer.initialize(); }

22.
23. return objTransform;

24. }

Figure 5 shows the code segment for PointSoundScape.java, where two methods, addSound
and addAvatar, are provided to add stationary PointSound sources and a Soundscape are
added to the scene graph. Specifically, addAvatar adds a PointSound to simulate footsteps
at the current position, while addSound adds two other PointSound sources.
Lines 6 and 7 of addSound specify the sound files to be used for these two PointSound
sources, line 5 sets the position of one source, while lines 10 and 11 provide the attenuation
characteristics of both sources through a series of distance gain pairs in an array.