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Fixed and tested particle birds

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barnold1953 2014-06-02 11:41:50 -07:00
parent 9e882957c4
commit e669f1d835
1 changed files with 32 additions and 56 deletions
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88
examples/particleBirds.js
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@ -11,23 +11,12 @@
// See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html // See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
// //
// Normalizes a vector to unit length
function vNormalize(v) {
var length = vLength(v);
var rval = { x: v.x / length, y: v.y / length, z: v.z / length };
return rval;
}
// Multiply vector by scalar // Multiply vector by scalar
function vScalarMult(v, s) { function vScalarMult(v, s) {
var rval = { x: v.x * s, y: v.y * s, z: v.z * s }; var rval = { x: v.x * s, y: v.y * s, z: v.z * s };
return rval; return rval;
} }
function vLength(v) {
return Math.sqrt(v.x * v.x + v.y * v.y + v.z * v.z);
}
function printVector(v) { function printVector(v) {
print(v.x + ", " + v.y + ", " + v.z + "\n"); print(v.x + ", " + v.y + ", " + v.z + "\n");
} }
@ -37,23 +26,6 @@ function randVector(a, b) {
return rval; 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 // Returns a vector which is fraction of the way between a and b
function vInterpolate(a, b, fraction) { 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 }; 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 };
@ -65,8 +37,6 @@ var startTimeInSeconds = new Date().getTime() / 1000;
var birdLifetime = 20; // lifetime of the birds in seconds! var birdLifetime = 20; // lifetime of the birds in seconds!
var range = 1.0; // Over what distance in meters do you want the flock to fly around var range = 1.0; // Over what distance in meters do you want the flock to fly around
var frame = 0; var frame = 0;
var moving = false;
var tweeting = 0;
var CHANCE_OF_MOVING = 0.1; var CHANCE_OF_MOVING = 0.1;
var CHANCE_OF_TWEETING = 0.05; var CHANCE_OF_TWEETING = 0.05;
@ -74,14 +44,21 @@ var BIRD_GRAVITY = -0.1;
var BIRD_FLAP_SPEED = 10.0; var BIRD_FLAP_SPEED = 10.0;
var BIRD_VELOCITY = 0.5; var BIRD_VELOCITY = 0.5;
var myPosition = MyAvatar.position; var myPosition = MyAvatar.position;
var targetPosition = myPosition;
var range = 1.0; // Distance around avatar where I can move var range = 1.0; // Distance around avatar where I can move
var particleID; // This is our Bird object
var birdParticleIDs = []; function Bird (particleID, tweetSound, targetPosition) {
var birdTweetSounds = []; this.particleID = particleID;
var previousFlapOffsets = []; this.tweetSound = tweetSound;
this.previousFlapOffset = 0;
this.targetPosition = targetPosition;
this.moving = false;
this.tweeting = -1;
}
// Array of birds
var birds = [];
function addBird() function addBird()
{ {
@ -111,22 +88,19 @@ function addBird()
color = { red: 50, green: 67, blue: 144 }; color = { red: 50, green: 67, blue: 144 };
size = 0.15; size = 0.15;
} }
size = 10000;
var properties = { var properties = {
lifetime: birdLifetime, lifetime: birdLifetime,
position: randVector(-range, range), position: Vec3.sum(randVector(-range, range), myPosition),
velocity: { x: 0, y: 0, z: 0 }, velocity: { x: 0, y: 0, z: 0 },
gravity: { x: 0, y: BIRD_GRAVITY, z: 0 }, gravity: { x: 0, y: BIRD_GRAVITY, z: 0 },
radius : size, radius : size,
color: color color: color
}; };
previousFlapOffsets.push(0.0); birds.push(new Bird(Particles.addParticle(properties), tweet, properties.position));
birdTweetSounds.push(tweet);
birdParticleIDs.push(Particles.addParticle(properties));
} }
var numBirds = 1; var numBirds = 30;
// Generate the birds // Generate the birds
for (var i = 0; i < numBirds; i++) { for (var i = 0; i < numBirds; i++) {
@ -152,26 +126,26 @@ function updateBirds(deltaTime) {
// Update all the birds // Update all the birds
for (var i = 0; i < numBirds; i++) { for (var i = 0; i < numBirds; i++) {
particleID = birdParticleIDs[i]; particleID = birds[i].particleID;
var properties = Particles.getParticleProperties(particleID); var properties = Particles.getParticleProperties(particleID);
// Tweeting behavior // Tweeting behavior
if (tweeting == 0) { if (birds[i].tweeting == 0) {
if (Math.random() < CHANCE_OF_TWEETING) { if (Math.random() < CHANCE_OF_TWEETING) {
var options = new AudioInjectionOptions(); var options = new AudioInjectionOptions();
options.position = properties.position; options.position = properties.position;
options.volume = 0.75; options.volume = 0.75;
Audio.playSound(birdTweetSounds[i], options); Audio.playSound(birds[i].tweetSound, options);
tweeting = 10; birds[i].tweeting = 10;
} }
} else { } else {
tweeting -= 1; birds[i].tweeting -= 1;
} }
// Begin movement by getting a target // Begin movement by getting a target
if (moving == false) { if (birds[i].moving == false) {
if (Math.random() < CHANCE_OF_MOVING) { if (Math.random() < CHANCE_OF_MOVING) {
targetPosition = vPlus(randVector(-range, range), myPosition); var targetPosition = Vec3.sum(randVector(-range, range), myPosition);
if (targetPosition.x < 0) { if (targetPosition.x < 0) {
targetPosition.x = 0; targetPosition.x = 0;
@ -192,26 +166,28 @@ function updateBirds(deltaTime) {
targetPosition.z = TREE_SCALE; targetPosition.z = TREE_SCALE;
} }
moving = true; birds[i].targetPosition = targetPosition;
birds[i].moving = true;
} }
} }
// If we are moving, move towards the target // If we are moving, move towards the target
if (moving) { if (birds[i].moving) {
var desiredVelocity = vMinus(targetPosition, properties.position); var desiredVelocity = Vec3.subtract(birds[i].targetPosition, properties.position);
desiredVelocity = vScalarMult(vNormalize(desiredVelocity), BIRD_VELOCITY); desiredVelocity = vScalarMult(Vec3.normalize(desiredVelocity), BIRD_VELOCITY);
properties.velocity = vInterpolate(properties.velocity, desiredVelocity, 0.2); properties.velocity = vInterpolate(properties.velocity, desiredVelocity, 0.2);
// If we are near the target, we should get a new target // If we are near the target, we should get a new target
if (vLength(vMinus(properties.position, targetPosition)) < (properties.radius / 5.0)) { if (Vec3.length(Vec3.subtract(properties.position, birds[i].targetPosition)) < (properties.radius / 5.0)) {
moving = false; birds[i].moving = false;
} }
} }
// Use a cosine wave offset to make it look like its flapping. // Use a cosine wave offset to make it look like its flapping.
var offset = Math.cos(nowTimeInSeconds * BIRD_FLAP_SPEED) * properties.radius; var offset = Math.cos(nowTimeInSeconds * BIRD_FLAP_SPEED) * properties.radius;
properties.position.y = properties.position.y + (offset - previousFlapOffsets[i]); properties.position.y = properties.position.y + (offset - birds[i].previousFlapOffset);
// Change position relative to previous offset. // Change position relative to previous offset.
previousFlapOffsets[i] = offset; birds[i].previousFlapOffset = offset;
// Update the particle // Update the particle
Particles.editParticle(particleID, properties); Particles.editParticle(particleID, properties);