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HTML 

              
                <!-- My scene -->
	<canvas id="scene"></canvas>

<!--
  I created a collection of small examples in Three.js to understand very quickly the purpose of some functions.
  You can visit the 'website' of the entire collection of pens here : http://mamboleoo.be/learnThree/

  You can also see the collection in CodePen
  https://codepen.io/collection/DrxLEd/

  Do not hesitate to comment if there is something wrong (I'm still learning)

  Thanks !
-->
!

CSS 

              
                body,html{width:100%;height:100%;padding:0;margin:0;overflow: hidden;}
!

JS 

              
                
var ww = window.innerWidth,
	wh = window.innerHeight;

function init(){

	/* WEBGL RENDERER */
	renderer = new THREE.WebGLRenderer({canvas : document.getElementById('scene')});
	renderer.setClearColor(0x3F3F3F);
	renderer.setSize(ww,wh);

	/* SCENE */
	scene = new THREE.Scene();
	//Add fog in my scene
	//0x3f3f3f = the color that will be added on my object
	//The minimum distance between the camera and the object to start the fog
	//Any element beyond 950px from the camera will be completely grey
	// < 500px = no fog
	// > 500px = fog
	// > 950px = invisible
	scene.fog = new THREE.Fog( 0x3f3f3f, 500, 1000 );

	/* CAMERA */
	camera = new THREE.PerspectiveCamera(50, ww/wh, 1, 10000 );
	camera.position.set(0, 250, 700);
	camera.lookAt(new THREE.Vector3(0,0,0));
	scene.add(camera);


	/* LIGHT */
	light = new THREE.DirectionalLight(0xffffff, 1);
	light.position.set( 0, 500, 100 );
	scene.add(light);

	createBox();

	renderer.render(scene,camera);

	animate();
};

function createBox(){

	cubes = new THREE.Object3D();

	geometry = new THREE.BoxGeometry(50,50,50);
	texture = new THREE.MeshLambertMaterial({color:0x00ff00 });

	for(var i=0;i<70;i++){
		cube = new THREE.Mesh(geometry, texture);

		cube.position.x = (Math.random()-.5)*ww;
		cube.position.y = (Math.random()-.5)*wh;

		//Create a random variable for each cube so they will move "randomly"
		//Create a random speed for my cube (just for fun)
		cube.random = parseInt((Math.random()-.5)*500);
		cube.speed = Math.random()+.1;

		cubes.add(cube);
	}

	scene.add(cubes);

};

var animate = function () {

	requestAnimationFrame(animate);

	for(var i=0;i<70;i++){

		var cube = cubes.children[i];

		//Move my cube
		cube.position.z = Math.sin(cube.random/70)*500;

		//Increase the start position of the cube
		cube.random += cube.speed;

	}


	renderer.render(scene, camera);
};

init();
!
999px

Console