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HTML

              
                <!-- OBJs from Google (https://poly.google.com/) -->

<div class="triggers">
	<span data-disabled="true">Sphere</span>
	<span data-disabled="true">Cube</span>
	<span data-disabled="true">Rocket</span>
	<span data-disabled="true">Spaceman</span>
</div>
              
            
!

CSS

              
                body {
	font-family: 'Titillium Web', sans-serif;
	margin: 0;
	overflow: hidden;
}

.triggers {
	bottom: 20px;
	color: white;
	left: 50%;
	position: absolute;
	text-align: center;
	transform: translateX(-50%);
	width: 100%;
	z-index: 10;
	
	span {
		cursor: pointer;
		display: inline-block;
		font-size: 14px;
		margin: 0 20px;
		padding: 2px 4px;
		transition: opacity .5s, color .5s;
		
		&[data-disabled="true"] {
			opacity: 0.3;
			pointer-events: none;
		}
		&:hover {
			color: red;
		}
	}
}
              
            
!

JS

              
                // Options
const numberOfParticles = 6000;
		
const particleImage = 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/605067/particle-tiny.png',
			particleColor = '0xFFFFFF',
			particleSize = .1;

const defaultAnimationSpeed = 1,
			morphAnimationSpeed = 3;






// Triggers
const triggers = document.getElementsByClassName('triggers')[0].querySelectorAll('span')

var stats = new Stats();
stats.showPanel(0);
// document.body.appendChild( stats.dom );

// Renderer
var renderer = new THREE.WebGLRenderer();
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );

// Ensure Full Screen on Resize
function fullScreen () {
	camera.aspect = window.innerWidth / window.innerHeight;
	camera.updateProjectionMatrix();

	renderer.setSize( window.innerWidth, window.innerHeight );
}

window.addEventListener('resize', fullScreen, false)

// Scene
var scene = new THREE.Scene();

// Camera and position
var camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 10000 );

camera.position.y = 25;
camera.position.z = 36;

// Lighting
// var light = new THREE.AmbientLight( 0x404040, 1 ); // soft white light
// scene.add( light );

// Orbit Controls
var controls = new THREE.OrbitControls( camera );
controls.update();

// Particle Vars
var particleCount = numberOfParticles;

let spherePoints,
		cubePoints,
		rocketPoints,
		spacemanPoints;

var particles = new THREE.Geometry(),
		sphereParticles = new THREE.Geometry(),
		cubeParticles = new THREE.Geometry(),
		rocketParticles = new THREE.Geometry(),
		spacemanParticles = new THREE.Geometry();

var pMaterial = new THREE.PointCloudMaterial({
			color: particleColor,
			size: particleSize,
			map: THREE.ImageUtils.loadTexture(particleImage),
			blending: THREE.AdditiveBlending,
			transparent: true
});

// Objects
var geometry = new THREE.SphereGeometry( 5, 30, 30 );

spherePoints = THREE.GeometryUtils.randomPointsInGeometry(geometry, particleCount)

var geometry = new THREE.BoxGeometry( 9, 9, 9 );

cubePoints = THREE.GeometryUtils.randomPointsInGeometry(geometry, particleCount)

// Custom (OGJ) Objects

const codepenAssetUrl = 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/605067/';

var objLoader = new THREE.OBJLoader();
objLoader.setPath(codepenAssetUrl);
objLoader.load( 'CartoonRocket.obj', function ( object ) {	
	object.traverse( function ( child ) {
		if ( child instanceof THREE.Mesh ) {
			let scale = 2.1;
			
			let area = new THREE.Box3();
				area.setFromObject( child );
			let yOffset = (area.max.y * scale) / 2;
			
			child.geometry.scale(scale,scale,scale);
			rocketPoints = THREE.GeometryUtils.randomPointsInBufferGeometry(child.geometry, particleCount);
			createVertices(rocketParticles, rocketPoints, yOffset, 2);
		}
	});
});

var objLoader = new THREE.OBJLoader();
objLoader.setPath(codepenAssetUrl);
objLoader.load( 'Astronaut.obj', function ( object ) {
	object.traverse( function ( child ) {
		if ( child instanceof THREE.Mesh ) {
			let scale = 4.6;
			
			let area = new THREE.Box3();
				area.setFromObject( child );
			let yOffset = (area.max.y * scale) / 2;
			
			child.geometry.scale(scale,scale,scale);
			spacemanPoints = THREE.GeometryUtils.randomPointsInBufferGeometry(child.geometry, particleCount);
			createVertices(spacemanParticles, spacemanPoints, yOffset, 3);
		}
	});
});

// Particles
for (var p = 0; p < particleCount; p++) {
	var vertex = new THREE.Vector3();
			vertex.x = 0;
			vertex.y = 0;
			vertex.z = 0;

	particles.vertices.push(vertex);
}

createVertices (sphereParticles, spherePoints, null, null)
createVertices (cubeParticles, cubePoints, null, 1)

function createVertices (emptyArray, points, yOffset = 0, trigger = null) {
	for (var p = 0; p < particleCount; p++) {
		var vertex = new THREE.Vector3();
				vertex.x = points[p]['x'];
				vertex.y = points[p]['y'] - yOffset;
				vertex.z = points[p]['z'];

		emptyArray.vertices.push(vertex);
	}
	if (trigger !== null) {
		triggers[trigger].setAttribute('data-disabled', false)
	}
}

var particleSystem = new THREE.PointCloud(
    particles,
    pMaterial
);

particleSystem.sortParticles = true;

// Add the particles to the scene
scene.add(particleSystem);

// Animate
const normalSpeed = (defaultAnimationSpeed/100),
			fullSpeed = (morphAnimationSpeed/100)

let animationVars = {
	speed: normalSpeed
}

function animate() {
	stats.begin();
	particleSystem.rotation.y += animationVars.speed;	
	particles.verticesNeedUpdate = true; 
	stats.end();
	
	window.requestAnimationFrame( animate );
	renderer.render( scene, camera );
}

animate();
setTimeout(toSphere, 500);

function toSphere () {
	handleTriggers(0);
	morphTo(sphereParticles);
}

function toCube () {
	handleTriggers(1);
	morphTo(cubeParticles);
}

function toRocket () {
	handleTriggers(2);
	morphTo(rocketParticles);
}

function toSpaceman () {
	handleTriggers(3);
	morphTo(spacemanParticles);
}

function morphTo (newParticles, color = '0xffffff') {
	TweenMax.to(animationVars, .3, {ease:
Power4.easeIn, speed: fullSpeed, onComplete: slowDown});
	particleSystem.material.color.setHex(color);
	
	for (var i = 0; i < particles.vertices.length; i++){
		TweenMax.to(particles.vertices[i], 4, {ease:
Elastic.easeOut.config( 1, 0.75), x: newParticles.vertices[i].x, y: newParticles.vertices[i].y, z: newParticles.vertices[i].z})
	}
}

function slowDown () {
	TweenMax.to(animationVars, 4, {ease:
Power2.easeOut, speed: normalSpeed, delay: 1});
}

triggers[0].addEventListener('click', toSphere)
triggers[1].addEventListener('click', toCube)
triggers[2].addEventListener('click', toRocket)
triggers[3].addEventListener('click', toSpaceman)

function handleTriggers (disable) {
	for (var x = 0; x < triggers.length; x++) {
		if (disable === x) {
			triggers[x].setAttribute('data-disabled', true)		
		} else {
			triggers[x].setAttribute('data-disabled', false)
		}
	}	
}
              
            
!
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