////  particlesTest.js//  examples/example/entities////  Created by David Rowe on 2 Sep 2015.//  Copyright 2015 High Fidelity, Inc.////  Click on the box entity to display different particle effects.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// (function () {    var box,        sphere,        sphereDimensions = { x: 0.4, y: 0.8, z: 0.2 },        pointDimensions = { x: 0.0, y: 0.0, z: 0.0 },        sphereOrientation = Quat.fromPitchYawRollDegrees(-60.0, 30.0, 0.0),        verticalOrientation = Quat.fromPitchYawRollDegrees(-90.0, 0.0, 0.0),        particles,        particleExample = -1,        PARTICLE_RADIUS = 0.04,        SLOW_EMIT_RATE = 2.0,        HALF_EMIT_RATE = 50.0,        FAST_EMIT_RATE = 100.0,        SLOW_EMIT_SPEED = 0.025,        FAST_EMIT_SPEED = 1.0,        GRAVITY_EMIT_ACCELERATON = { x: 0.0, y: -0.3, z: 0.0 },        ZERO_EMIT_ACCELERATON = { x: 0.0, y: 0.0, z: 0.0 },        PI = 3.141592,        DEG_TO_RAD = PI / 180.0,        NUM_PARTICLE_EXAMPLES = 18;     function onClickDownOnEntity(entityID) {        if (entityID === box || entityID === sphere || entityID === particles) {            particleExample = (particleExample + 1) % NUM_PARTICLE_EXAMPLES;             switch (particleExample) {            case 0:                print("Simple emitter");                Entities.editEntity(particles, {                    speedSpread: 0.0,                    accelerationSpread: { x: 0.0, y: 0.0, z: 0.0 },                    radiusSpread: 0.0,                    isEmitting: true                });                break;            case 1:                print("Speed spread");                Entities.editEntity(particles, {                    speedSpread: 0.1                });                break;            case 2:                print("Acceleration spread");                Entities.editEntity(particles, {                    speedSpread: 0.0,                    accelerationSpread: { x: 0.0, y: 0.1, z: 0.0 }                });                break;            case 3:                print("Radius spread - temporarily not working");                Entities.editEntity(particles, {                    accelerationSpread: { x: 0.0, y: 0.0, z: 0.0 },                    radiusSpread: 0.035                });                break;            case 4:                print("Radius start and finish");                Entities.editEntity(particles, {                    radiusSpread: 0.0,                    radiusStart: 0.0,                    particleRadius: PARTICLE_RADIUS,                    radiusFinish: 0.0                });                break;            case 5:                print("Alpha 0.5");                Entities.editEntity(particles, {                    radiusStart: PARTICLE_RADIUS,                    particleRadius: PARTICLE_RADIUS,                    radiusFinish: PARTICLE_RADIUS,                    alpha: 0.5                });                break;            case 6:                print("Alpha spread - temporarily not working");                Entities.editEntity(particles, {                    alpha: 0.5,                    alphaSpread: 0.5                });                break;            case 7:                print("Alpha start and finish");                Entities.editEntity(particles, {                    alphaSpread: 0.0,                    alpha: 1.0,                    alphaStart: 0.0,                    alphaFinish: 0.0                });                break;            case 8:                print("Color spread - temporarily not working");                Entities.editEntity(particles, {                    alpha: 1.0,                    alphaStart: 1.0,                    alphaFinish: 1.0,                    color: { red: 128, green: 128, blue: 128 },                    colorSpread: { red: 128, green: 0, blue: 0 }                });                break;            case 9:                print("Color start and finish");                Entities.editEntity(particles, {                    color: { red: 255, green: 255, blue: 255 },                    colorSpread: { red: 0, green: 0, blue: 0 },                    colorStart: { red: 255, green: 0, blue: 0 },                    colorFinish: { red: 0, green: 255, blue: 0 }                });                break;            case 10:                print("Emit in a spread beam");                Entities.editEntity(particles, {                    colorStart: { red: 255, green: 255, blue: 255 },                    colorFinish: { red: 255, green: 255, blue: 255 },                    alphaFinish: 0.0,                    emitRate: FAST_EMIT_RATE,                    polarFinish: 2.0 * DEG_TO_RAD                });                break;            case 11:                print("Emit in all directions from point");                Entities.editEntity(particles, {                    emitSpeed: SLOW_EMIT_SPEED,                    emitAcceleration: ZERO_EMIT_ACCELERATON,                    polarFinish: PI                });                break;            case 12:                print("Emit from sphere surface");                Entities.editEntity(particles, {                    colorStart: { red: 255, green: 255, blue: 255 },                    colorFinish: { red: 255, green: 255, blue: 255 },                    emitDimensions: sphereDimensions,                    emitOrientation: sphereOrientation                });                Entities.editEntity(box, {                    visible: false                });                Entities.editEntity(sphere, {                    visible: true                });                break;            case 13:                print("Emit from hemisphere of sphere surface");                Entities.editEntity(particles, {                    polarFinish: PI / 2.0                });                break;            case 14:                print("Emit from equator of sphere surface");                Entities.editEntity(particles, {                    polarStart: PI / 2.0,                    emitRate: HALF_EMIT_RATE                });                break;            case 15:                print("Emit from half equator of sphere surface");                Entities.editEntity(particles, {                    azimuthStart: -PI / 2.0,                    azimuthFinish: PI / 2.0                });                break;            case 16:                print("Emit within eighth of sphere volume");                Entities.editEntity(particles, {                    polarStart: 0.0,                    polarFinish: PI / 2.0,                    azimuthStart: 0,                    azimuthFinish: PI / 2.0,                    emitRadiusStart: 0.0,                    alphaFinish: 1.0,                    emitSpeed: 0.0                });                break;            case 17:                print("Stop emitting");                Entities.editEntity(particles, {                    emitDimensions: pointDimensions,                    emitOrientation: verticalOrientation,                    alphaFinish: 1.0,                    emitRate: SLOW_EMIT_RATE,                    emitSpeed: FAST_EMIT_SPEED,                    emitAcceleration: GRAVITY_EMIT_ACCELERATON,                    polarStart: 0.0,                    polarFinish: 0.0,                    azimuthStart: -PI,                    azimuthFinish: PI,                    isEmitting: false                });                Entities.editEntity(box, {                    visible: true                });                Entities.editEntity(sphere, {                    visible: false                });                break;            }        }    }     function setUp() {        var boxPoint,            spawnPoint;         boxPoint = Vec3.sum(MyAvatar.position, Vec3.multiply(4.0, Quat.getFront(Camera.getOrientation())));        boxPoint = Vec3.sum(boxPoint, { x: 0.0, y: -0.5, z: 0.0 });        spawnPoint = Vec3.sum(boxPoint, { x: 0.0, y: 1.0, z: 0.0 });         box = Entities.addEntity({            type: "Box",            name: "ParticlesTest Box",            position: boxPoint,            rotation: verticalOrientation,            dimensions: { x: 0.3, y: 0.3, z: 0.3 },            color: { red: 128, green: 128, blue: 128 },            lifetime: 3600,  // 1 hour; just in case            visible: true        });         // Same size and orientation as emitter when ellipsoid.        sphere = Entities.addEntity({            type: "Sphere",            name: "ParticlesTest Sphere",            position: boxPoint,            rotation: sphereOrientation,            dimensions: sphereDimensions,            color: { red: 128, green: 128, blue: 128 },            lifetime: 3600,  // 1 hour; just in case            visible: false        });         // 1.0m above the box or ellipsoid.        particles = Entities.addEntity({            type: "ParticleEffect",            name: "ParticlesTest Emitter",            position: spawnPoint,            emitOrientation: verticalOrientation,            particleRadius: PARTICLE_RADIUS,            radiusSpread: 0.0,            emitRate: SLOW_EMIT_RATE,            emitSpeed: FAST_EMIT_SPEED,            speedSpread: 0.0,            emitAcceleration: GRAVITY_EMIT_ACCELERATON,            accelerationSpread: { x: 0.0, y: 0.0, z: 0.0 },            textures: "https://hifi-public.s3.amazonaws.com/alan/Particles/Particle-Sprite-Smoke-1.png",            color: { red: 255, green: 255, blue: 255 },            lifespan: 5.0,            locked: false,            isEmitting: false,            lifetime: 3600  // 1 hour; just in case        });         Entities.clickDownOnEntity.connect(onClickDownOnEntity);         print("Click on the box to cycle through particle examples");    }     function tearDown() {        Entities.clickDownOnEntity.disconnect(onClickDownOnEntity);        Entities.deleteEntity(particles);        Entities.deleteEntity(box);        Entities.deleteEntity(sphere);    }     setUp();    Script.scriptEnding.connect(tearDown);}());