Audio - Interactive Web-Based Virtual Reality with Java 3D - page 273

Figure 7. First code segment for SoundTest.java

24. aAttributes.setCapability(AuralAttributes.ALLOW_ATTRIBUTE_GAIN_WRITE);

25. aAttributes.setCapability(AuralAttributes.ALLOW_FREQUENCY_SCALE_FACTOR_WRITE);

26. aAttributes.setCapability(AuralAttributes.ALLOW_REFLECTION_COEFFICIENT_WRITE);

27. aAttributes.setCapability(AuralAttributes.ALLOW_REVERB_DELAY_WRITE);

28. aAttributes.setCapability(AuralAttributes.ALLOW_REVERB_ORDER_WRITE);

29. aAttributes.setCapability(AuralAttributes.ALLOW_ROLLOFF_WRITE);

30. aAttributes.setCapability(AuralAttributes.ALLOW_VELOCITY_SCALE_FACTOR_WRITE);

31. aAttributes.setDistanceFilter(distanceFilter);

32. sound.setCapability(Sound.ALLOW_ENABLE_WRITE);

33. sound.setCapability(Sound.ALLOW_ENABLE_READ);

34. sound.setCapability(PointSound.ALLOW_DISTANCE_GAIN_WRITE);
35. sound.setSchedulingBounds(sBounds);
36. sound.setSoundData(data);
37. sound.setInitialGain(2.0f);
38. sound.setLoop(Sound.INFINITE_LOOPS);
39. sScape.setCapability(Soundscape.ALLOW_ATTRIBUTES_WRITE);
40. sScape.setCapability(Soundscape.ALLOW_APPLICATION_BOUNDS_WRITE);

41. sScape.setAuralAttributes(aAttributes);
42. sScape.setApplicationBounds(sScapeBounds);
43.
44. protected void decode(ParamSlider paramSlider, int idx) {
45.

float value = paramSlider.getValue();

46. try switch(idx) {

47. case 0: aAttributes.setAttributeGain(value); break;

48. case 1: aAttributes.setFrequencyScaleFactor(value); break;

49. case 2: aAttributes.setReflectionCoefficient(value); break;

50. case 3: aAttributes.setReverbDelay(value); break;

51. case 4: aAttributes.setReverbOrder((int)value); break;

52. case 5: aAttributes.setRolloff(value); System.out.println(value); break;

53. case 6: aAttributes.setVelocityScaleFactor(value); break;

54. case 7: v3f.set(0.0f, 0.0f, -value); t3d.setTranslation(v3f); tg.setTransform(t3d); break;

55. default: };

56. catch (NumberFormatException e){}

57. sScape.setApplicationBounds(sScapeBounds);

58. }

summary

In this chapter, we have outlined how 3D sound sources and aural characteristics can be
integrated into the virtual world built using Java 3D. Three types of sources, Background-
Sound, PointSound and ConeSound, are supported, and this become audible if the activation
radius intersects with the scheduling bounds of the sound. Controls are also available to