overte/examples/particleBird.js

//
//  particleBird.js 
//  hifi
//
//  This sample script moves a voxel around like a bird and sometimes makes tweeting noises 
//

function vLength(v) {
    return Math.sqrt(v.x * v.x + v.y * v.y + v.z * v.z);
}

function printVector(v) {
    print(v.x + ", " + v.y + ", " + v.z + "\n");
}

//  Create a random vector with individual lengths between a,b
function randVector(a, b) {
    var rval = { x: a + Math.random() * (b - a), y: a + Math.random() * (b - a), z: a + Math.random() * (b - a) };
    return rval;
}

function vMinus(a, b) { 
    var rval = { x: a.x - b.x, y: a.y - b.y, z: a.z - b.z };
    return rval;
}

function vPlus(a, b) { 
    var rval = { x: a.x + b.x, y: a.y + b.y, z: a.z + b.z };
    return rval;
}

function vCopy(a, b) {
    a.x = b.x;
    a.y = b.y;
    a.z = b.z;
    return;
}

//  Returns a vector which is fraction of the way between a and b
function vInterpolate(a, b, fraction) { 
    var rval = { x: a.x + (b.x - a.x) * fraction, y: a.y + (b.y - a.y) * fraction, z: a.z + (b.z - a.z) * fraction };
    return rval;
}

//  Decide what kind of bird we are 
var tweet;
var color;
var size;
var which = Math.random();
if (which < 0.2) {
    tweet = new Sound("https://s3-us-west-1.amazonaws.com/highfidelity-public/sounds/Animals/bushtit_1.raw");
    color = { r: 100, g: 50, b: 120 };
    size = 0.08;
} else if (which < 0.4) {
    tweet = new Sound("https://s3-us-west-1.amazonaws.com/highfidelity-public/sounds/Animals/rosyfacedlovebird.raw");
    color = { r: 100, g: 150, b: 75 };
    size = 0.09;
} else if (which < 0.6) {
    tweet = new Sound("https://s3-us-west-1.amazonaws.com/highfidelity-public/sounds/Animals/saysphoebe.raw");
    color = { r: 84, g: 121, b: 36 };
    size = 0.05;
} else  if (which < 0.8) {
    tweet = new Sound("https://s3-us-west-1.amazonaws.com/highfidelity-public/sounds/Animals/mexicanWhipoorwill.raw");
    color = { r: 23, g: 197, b: 230 };
    size = 0.12;
} else {
    tweet = new Sound("https://s3-us-west-1.amazonaws.com/highfidelity-public/sounds/Animals/westernscreechowl.raw");
    color = { r: 50, g: 67, b: 144 };
    size = 0.15;
} 

var startPosition = { x: 0, y: 0, z: 0 };
var targetPosition = { x: 0, y: 0, z: 0 };

var range = 0.7;       //   Over what distance in meters do you want your bird to fly around 
var frame = 0;
var moving = false;
var tweeting = 0;
var moved = false;

var CHANCE_OF_MOVING = 0.02;
var CHANCE_OF_TWEETING = 0.01;
var START_HEIGHT_ABOVE_ME = 2.0;

var myPosition = MyAvatar.position;

var properties = {
    position: { x: myPosition.x, y: myPosition.y + START_HEIGHT_ABOVE_ME, z: myPosition.z },  
    velocity: { x: 0, y: 0, z: 0 },
    gravity: { x: 0, y: 0, z: 0 },
    radius : 0.1,
    color: { red: 0,
             green: 255,
             blue: 0 },
    lifetime: 60
};

position = properties.position; 

var range = 1.0;   //  Distance around avatar where I can move 

//  Create the actual bird 
var particleID = Particles.addParticle(properties);

function moveBird() {
    myPosition = MyAvatar.position;
    myPosition.y += START_HEIGHT_ABOVE_ME;
   frame++;
    if (frame % 3 == 0) {
        // Tweeting behavior
        if (tweeting == 0) {
            if (Math.random() < CHANCE_OF_TWEETING) {
                //print("tweet!" + "\n");
                var options = new AudioInjectionOptions();

                options.position = position;
                options.volume = 0.75;
                Audio.playSound(tweet, options);
                tweeting = 10;
            }
        } else {
            tweeting -= 1;
        }
        // Moving behavior 
        if (moving == false) {
            if (Math.random() < CHANCE_OF_MOVING) {
                targetPosition = randVector(- range, range);
                targetPosition = vPlus(targetPosition, myPosition);
                //printVector(position);
                moving = true;
            }
        }
        if (moving) {
            position = vInterpolate(position, targetPosition, 0.5);
            if (vLength(vMinus(position, targetPosition)) < (size / 5.0)) {
                moved = false;
                moving = false;
            } else {
                moved = true;
            }
        }
        if (moved || (tweeting > 0)) {
            if (tweeting > 0) {
                var newProperties = {
                    position: position, 
                    velocity: { x: 0, y: 0, z: 0 },
                    gravity: { x: 0, y: 0, z: 0 },
                    radius : size * 1.5,
                    color: { red: Math.random() * 255, green: 0, blue: 0 }
                };
            } else {
                var newProperties = {
                    position: position, 
                    velocity: { x: 0, y: 0, z: 0 },
                    gravity: { x: 0, y: 0, z: 0 },                   
                    radius : size,
                    color: { red: color.r, green: color.g, blue: color.b }
                    };
            }
            Particles.editParticle(particleID, newProperties);
            moved = false;
        }
    }
}

function killBird() {
    deleteParticle(particleID);
}

// register the call back so it fires before each data send
Agent.willSendVisualDataCallback.connect(moveBird);
Agent.scriptEnding.connect(killBird);