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// This is just playing with the tutorial from the lovely Spite:
// http://www.clicktorelease.com/blog/how-to-make-clouds-with-css-3d

/*
  Defining our variables
  world and viewport are DOM elements,
  worldXAngle and worldYAngle are floats that hold the world rotations,
  d is an int that defines the distance of the world from the camera
*/
var world = document.getElementById('world'),
    viewport = document.getElementById('viewport'),
    worldXAngle = 0,
    worldYAngle = 0,
    d = 0;

/*
  objects is an array of clouds bases
  layers is an array of clouds layers
*/
var objects = [],
    layers = [];

generate();

/*
  Creates a single cloud base: a div in world
  that is translated randomly into world space.
  Each axis goes from -256 to 256 pixels.
*/
function createCloud() {
  var div = document.createElement('div');
  div.className = 'cloudBase';
  var random_x = 256 - (Math.random() * 512);
  var random_y = 256 - (Math.random() * 512);
  var random_z = 256 - (Math.random() * 512);
  var t = 'translateX(' + random_x + 'px) \
           translateY(' + random_y + 'px) \
           translateZ(' + random_z + 'px)';
  div.style.transform = t;
  world.appendChild(div);
  
  for (var j = 0; j < 5 + Math.round(Math.random() * 10); j++) {
    // var cloud = document.createElement('div');
    var cloud = document.createElement('img');
    
    // http://pngimg.com/upload/cloud_PNG28.png
    cloud.src = 'http://www.clicktorelease.com/code/css3dclouds/cloud.png';
    cloud.className = 'cloudLayer';
    cloud.style.opacity = .8;
    var random_x = 256 - (Math.random() * 512);
    var random_y = 256 - (Math.random() * 512);
    var random_z = 100 - (Math.random() * 200);
    var random_a = Math.random() * 360;
    var random_s = .25 + Math.random();
    random_x *= .2;
    random_y *= .2;
    cloud.data = {
      x: random_x,
      y: random_y,
      z: random_z,
      a: random_a,
      s: random_s,
      speed: .1 * Math.random()
    };
    var t = 'translateX(' + random_x + 'px) \
             translateY(' + random_y + 'px) \
             translateZ(' + random_z + 'px) \
             rotateZ(' + random_a + 'deg) \
             scale(' + random_s + ')';
    cloud.style.transform = t;
    div.appendChild(cloud);
    layers.push(cloud);
  }
  
  return div;
}

/*
  Event listener to transform mouse position into angles
  from -180 to 180 degrees, both vertically and horizontally
*/
window.addEventListener('mousemove', function(e) {
  worldYAngle = -(.5 - (e.clientX/window.innerWidth)) * 180;
  worldXAngle = -(.5 - (e.clientY/window.innerHeight)) * 180;
  updateView();
});

window.addEventListener('mousewheel', onContainerMouseWheel);
window.addEventListener('DOMMouseScroll', onContainerMouseWheel);

/*
  Clears the DOM of previous clouds bases
  and generates a new set of cloud bases
*/
function generate() {
  objects = [];
  if (world.hasChildNodes()) {
    while (world.childNodes.length >= 1) {
      world.removeChild(world.firstChild);
    }
  }
  for (var j = 0; j < 5; j++) {
    objects.push(createCloud());
  }
}

/*
  Changes the transform property of world to be
  translated in the Z axis by d pixels,
  rotated in the X axis by worldXAngle degrees and
  rotated in the Y axis by worldYAngle degrees.
*/
function updateView() {
  world.style.transform = 'translateZ(' + d + 'px) \
    rotateX(' + worldXAngle + 'deg) \
    rotateY(' + worldYAngle + 'deg)';
}

function onContainerMouseWheel(event) {
  event = event ? event : window.event;
  d = d - (event.detail ? event.detail * -5 : event.wheelDelta / 8);
  updateView();
}

function update() {
  for (var j = 0; j < layers.length; j++) {
    var layer = layers[j];
    layer.data.a += layer.data.speed;
    var t = 'translateX( ' + layer.data.x + 'px ) \
             translateY( ' + layer.data.y + 'px ) \
             translateZ( ' + layer.data.z + 'px ) \
             rotateY( ' + ( - worldYAngle ) + 'deg ) \
             rotateX( ' + ( - worldXAngle ) + 'deg ) \
             rotateZ( ' + layer.data.a + 'deg ) \
             scale( ' + layer.data.s + ')';
    layer.style.transform = t;
    // layer.style.filter = 'blur(5px)';
  }
  requestAnimationFrame(update);
}

update();

CSS

#viewport {
  position: absolute;
  overflow: hidden;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  perspective: 1000px;
  background-image: linear-gradient(bottom, #4584b4 28%, #1f4778 64%);
  background-image: -o-linear-gradient(bottom, #4584b4 28%, #1f4778 64%);
  background-image: -moz-linear-gradient(bottom, #4584b4 28%, #1f4778 64%);
  background-image: -webkit-linear-gradient(bottom, #4584b4 28%, #1f4778 64%);
  background-image: -ms-linear-gradient(bottom, #4584b4 28%, #1f4778 64%);
  background-image: -webkit-gradient(linear, left bottom, left top, color-stop(0.28, #4584b4), color-stop(0.64, #1f4778));
}

#world {
  position: absolute;
  height: 512px;
  width: 512px;
  top: 50%;
  left: 50%;
  margin-left: -256px;
  margin-top: -256px;
  transform-style: preserve-3d;
}
#world div {
  transform-style: preserve-3d;
}

.cloudBase {
  position: absolute;
  height: 20px;
  width: 20px;
  top: 256px;
  left: 256px;
  margin-top: -10px;
  margin-left: -10px;
}

.cloudLayer {
  position: absolute;
  height: 256px;
  width: 256px;
  top: 50%;
  left: 50%;
  margin-top: -128px;
  margin-left: -128px;
  transition: opacity .5s ease-out;
}

HTML

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