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flock of butterflies as entities
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examples/entitiesButterflyFlock.js
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247
examples/entitiesButterflyFlock.js
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//
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// butterflyFlockTest1.js
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//
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//
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// Created by Adrian McCarlie on August 2, 2014
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// Copyright 2014 High Fidelity, Inc.
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//
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// This sample script creates a swarm of butterfly Entities that fly around the avatar.
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//
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// Distributed under the Apache License, Version 2.0.
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// See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
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//
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function getRandomFloat(min, max) {
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return Math.random() * (max - min) + min;
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}
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// Multiply vector by scalar
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function vScalarMult(v, s) {
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var rval = { x: v.x * s, y: v.y * s, z: v.z * s };
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return rval;
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}
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function printVector(v) {
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print(v.x + ", " + v.y + ", " + v.z + "\n");
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}
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// Create a random vector with individual lengths between a,b
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function randVector(a, b) {
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var rval = { x: a + Math.random() * (b - a), y: a + Math.random() * (b - a), z: a + Math.random() * (b - a) };
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return rval;
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}
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// Returns a vector which is fraction of the way between a and b
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function vInterpolate(a, b, fraction) {
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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 };
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return rval;
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}
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var startTimeInSeconds = new Date().getTime() / 1000;
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var lifeTime = 60; // lifetime of the butterflies in seconds!
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var range = 1.0; // Over what distance in meters do you want the flock to fly around
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var frame = 0;
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var CHANCE_OF_MOVING = 0.9;
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var BUTTERFLY_GRAVITY = 0;//-0.06;
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var BUTTERFLY_FLAP_SPEED = 1.0;
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var BUTTERFLY_VELOCITY = 0.55;
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var myPosition = MyAvatar.position;
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var pitch = 0.0;//experimental
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var yaw = 0.0;//experimental
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var roll = 0.0; //experimental
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var rotation = Quat.fromPitchYawRollDegrees(pitch, yaw, roll);//experimental
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// This is our butterfly object
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function defineButterfly (entityID, targetPosition ) {
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this.entityID = entityID;
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this.previousFlapOffset = 0;
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this.targetPosition = targetPosition;
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this.moving = false;
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}
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// Array of butterflies
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var butterflies = [];
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var numButterflies = 20;
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function addButterfly( ){
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// Decide the size of butterfly
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var color = { red: 100, green: 100, blue: 100 };
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var size = 0;
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var which = Math.random();
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if (which < 0.2) {
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size = 0.08;
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} else if (which < 0.4) {
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size = 0.09;
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} else if (which < 0.6) {
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size = 0.8;
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} else if (which < 0.8) {
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size = 0.8;
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} else {
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size = 0.8;
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}
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myPosition = MyAvatar.position;
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// if ( frame < numButterflies){
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// myPosition = {x: myPosition.x, y: myPosition.y, z: myPosition.z };
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// }
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var properties = {
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type: "Model",
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lifetime: lifeTime,
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position: Vec3.sum(randVector(-range, range), myPosition),
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velocity: { x: 0, y: 0.0, z: 0 },
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gravity: { x: 0, y: 1.0, z: 0 },
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damping: 0.1,
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radius : size,
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color: color,
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rotation: rotation,
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//animationURL: "http://business.ozblog.me/objects/butterfly/newButterfly6.fbx",
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//animationIsPlaying: true,
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modelURL: "http://business.ozblog.me/objects/butterfly/newButterfly6.fbx"
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};
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properties.position.z = properties.position.z+1;
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butterflies.push(new defineButterfly(Entities.addEntity(properties), properties.position));
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}
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// Generate the butterflies
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for (var i = 0; i < numButterflies; i++) {
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addButterfly();
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}
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// Main update function
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function updateButterflies(deltaTime) {
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// Check to see if we've been running long enough that our butterflies are dead
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var nowTimeInSeconds = new Date().getTime() / 1000;
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if ((nowTimeInSeconds - startTimeInSeconds) >= lifeTime) {
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// print("our butterflies are dying, stop our script");
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Script.stop();
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return;
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}
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frame++;
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// Only update every third frame
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if ((frame % 3) == 0) {
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myPosition = MyAvatar.position;
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// Update all the butterflies
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for (var i = 0; i < numButterflies; i++) {
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entityID = butterflies[i].entityID;
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var properties = Entities.getEntityProperties(entityID);
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if (properties.position.y > myPosition.y + getRandomFloat(0.0,0.3)){ //0.3 //ceiling
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properties.gravity.y = - 3.0;
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properties.damping.y = 1.0;
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properties.velocity.y = 0;
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properties.velocity.x = properties.velocity.x;
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properties.velocity.z = properties.velocity.z;
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if (properties.velocity.x < 0.5){
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butterflies[i].moving = false;
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}
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if (properties.velocity.z < 0.5){
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butterflies[i].moving = false;
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}
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}
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if (properties.velocity.y <= -0.2) {
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properties.velocity.y = 0.22;
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properties.velocity.x = properties.velocity.x;
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properties.velocity.z = properties.velocity.z;
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}
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if (properties.position.y < myPosition.y - getRandomFloat(0.0,0.3)) { //-0.3 // floor
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properties.velocity.y = 0.9;
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properties.gravity.y = - 4.0;
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properties.velocity.x = properties.velocity.x;
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properties.velocity.z = properties.velocity.z;
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if (properties.velocity.x < 0.5){
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butterflies[i].moving = false;
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}
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if (properties.velocity.z < 0.5){
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butterflies[i].moving = false;
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}
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}
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// Begin movement by getting a target
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if (butterflies[i].moving == false) {
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if (Math.random() < CHANCE_OF_MOVING) {
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var targetPosition = Vec3.sum(randVector(-range, range), myPosition);
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if (targetPosition.x < 0) {
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targetPosition.x = 0;
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}
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if (targetPosition.y < 0) {
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targetPosition.y = 0;
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}
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if (targetPosition.z < 0) {
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targetPosition.z = 0;
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}
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if (targetPosition.x > TREE_SCALE) {
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targetPosition.x = TREE_SCALE;
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}
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if (targetPosition.y > TREE_SCALE) {
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targetPosition.y = TREE_SCALE;
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}
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if (targetPosition.z > TREE_SCALE) {
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targetPosition.z = TREE_SCALE;
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}
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butterflies[i].targetPosition = targetPosition;
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butterflies[i].moving = true;
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}
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}
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// If we are moving, move towards the target
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if (butterflies[i].moving) {
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var holding = properties.velocity.y;
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var desiredVelocity = Vec3.subtract(butterflies[i].targetPosition, properties.position);
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desiredVelocity = vScalarMult(Vec3.normalize(desiredVelocity), BUTTERFLY_VELOCITY);
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properties.velocity = vInterpolate(properties.velocity, desiredVelocity, 0.2);
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properties.velocity.y = holding ;
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// If we are near the target, we should get a new target
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if (Vec3.length(Vec3.subtract(properties.position, butterflies[i].targetPosition)) < (properties.radius / 1.0)) {
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butterflies[i].moving = false;
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}
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var yawRads = Math.atan2(properties.velocity.z, properties.velocity.x);
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yawRads = yawRads + Math.PI / 2.0;
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var newOrientation = Quat.fromPitchYawRollRadians(0.0, yawRads, 0.0);
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properties.rotation = newOrientation;
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}
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// Use a cosine wave offset to make it look like its flapping.
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var offset = Math.cos(nowTimeInSeconds * BUTTERFLY_FLAP_SPEED) * (properties.radius);
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properties.position.y = properties.position.y + (offset - butterflies[i].previousFlapOffset);
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// Change position relative to previous offset.
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butterflies[i].previousFlapOffset = offset;
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Entities.editEntity(entityID, properties);
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}
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}
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}
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// register the call back so it fires before each data send
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Script.update.connect(updateButterflies);
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