gistfile1.js

var createSound = new Sound("http://highfidelity-public.s3-us-west-1.amazonaws.com/sounds/Space%20Invaders/hit.raw");

var audioOptions = new AudioInjectionOptions();
audioOptions.volume = 0.9;

var particleIds = [];

var startTime = new Date();
var interval = 50.0;

var lastUpdate = new Date();

var spawnTime = 0;
var spawnDelay = 1000.0;

function update() {
  // update loop
  var current = new Date();
  if (current.valueOf() < lastUpdate.valueOf() + interval) {
    // only update at a given interval
    return;
  }
  if (spawnTime.valueOf() == 0 || current.valueOf() < spawnTime.valueOf() + spawnDelay) {
    // don't update until particles are ready
    return;
  }
  lastUpdate = current;
  var t = (current.valueOf() - spawnTime.valueOf()) * 0.005;
  for (var i = 0; i < particleIds.length; i++) {
    var pId = particleIds[i];
    if (Particles.identifyParticle(pId)) {
      var prop = Particles.getParticleProperties(pId);
      prop.color = { red: (Math.sin(t * i * 0.011) + 1) * 100.0,
		     green: (Math.sin(t * i * 0.01) + 1) * 100.0,
		     blue: (Math.sin(t * i * 0.0009) + 1) * 100.0
		   };
      var d = 0.02;
      var delta = { x: Math.sin(t * i * 0.1) * d,
		    y: Math.sin(t * i * 0.2) * d,
		    z: Math.sin(t * i * 0.3) * d
		  };
      prop.position = Vec3.sum(prop.position, delta);
      Particles.editParticle(pId, prop);
    }
  }
  print("updated: " + lastUpdate.valueOf());
}

function keyPressEvent(event) {
  if (event.text != "o") {
    return;
  }
  // create particles
  print("create particles now");
  particles = [];

  var cameraPos = Camera.getPosition();
  audioOptions.position = cameraPos;
  Audio.playSound(createSound, audioOptions);

  var targetDir = Quat.angleAxis(0, { x: 0, y: 1, z: 0 });
  targetDir = Quat.multiply(Camera.getOrientation(), targetDir);
  var forwardVector = Quat.getFront(targetDir);
  var distanceFromYou = 10.0;
  var startPos = Vec3.sum(cameraPos, Vec3.multiply(forwardVector, distanceFromYou));

  var r = 0.4;
  var s = 3;
  var dist = 2.0;
  for (var x = 0; x < s; x++) {
    for (var y = 0; y < s; y++) {
      for (var z = 0; z < s; z++) {
	var pos = { x: x*dist, y: y*dist, z: z*dist };
	var worldPos = Vec3.sum(startPos, pos);
	var pId = Particles.addParticle({
	  position: worldPos,
	  radius: r,
	  color: { red: 0, green: 100, blue: 100 },
	  velocity: 0,
	  gravity: { x: 0, y: 0, z: 0 },
	  lifetime: 10.0,
	  damping: 0 
	});
	particleIds.push(pId);
      }
    }
  }
  spawnTime = new Date();
}

Controller.keyPressEvent.connect(keyPressEvent);
Script.update.connect(update);