Part One: The Scene Graph

Part Two: The VRML Source Code (musical.wrl)

Here is the entire VRML 2.0 source code. Type (or paste) this code into a file called "musical.wrl".

#VRML V2.0 utf8
#Example of the use and control of sound
              
#Sphere which will act as an on/off switch
DEF SPHERE Transform {
  translation 0 0 0 
  children [
    DEF CLICKER TouchSensor {} 
    Shape {
      appearance Appearance {
         material Material {diffuseColor 0 0 1}   
      }
      geometry Sphere {radius 3}
    }
  ]
}

#Script to control the music
DEF MUSIC_SCRIPT Script {
  url "musical.class"
  scriptType "javabc"

  field SFNode sphere_trans USE SPHERE

  eventOut SFTime musicOn   
  eventOut SFTime musicOff
  
  eventIn SFBool clicked
}

#sound node
DEF MUSICALSOUND Sound  {
  location 0 0 0
  #inner radius - intensity is max within this 
  minBack  20
  minFront 20   
  #outer radius - sound drops off between inner 
  #radius and this, and can't be heard beyond this 
  maxBack  50
  maxFront 50   
  intensity 1
  source DEF MUSICALCLIP AudioClip {
    url "musical.wav"
    loop TRUE
    stopTime 1
  }
}

#route for mouse click
ROUTE CLICKER.isActive TO MUSIC_SCRIPT.clicked
#routes for music control
ROUTE MUSIC_SCRIPT.musicOn TO MUSICALCLIP.set_startTime 
ROUTE MUSIC_SCRIPT.musicOff TO MUSICALCLIP.set_stopTime 

Part Three: The Java Source Code (musical.java)

Here is the Java source code. Type this into a file called "musical.java".

/*
   musical.java : source for sound tutorial
   Written By : Jai Natarajan
                Sony Pictures Imageworks
*/
import vrml.*;
import vs.*;

public class musical extends Script {
  
  // Grab the eventOuts for music control
  SFTime musicOn = (SFTime)getEventOut("musicOn");
  SFTime musicOff = (SFTime)getEventOut("musicOff");
  
  //current status of the sound
  boolean musicPlaying = false;

  public musical() { }

  public void clicked(ConstSFBool ev, ConstSFTime time) {
    
  
    if(ev.getValue() == true) {
      return;
    }
    else {  
      // get time of click (most recent one we know of)
      double now = time.getValue();  
      if(!musicPlaying) {  // we need to switch it on
        // Set the startTime to the latest time
        musicOn.setValue(now);
      }
      else { // switch it off
        // Set the stopTime to latest time
        musicOff.setValue(now);
      }
      musicPlaying = !musicPlaying;
    }
  }
}