<!--
      WebGL particle head for a clients website. 
      See the full result on fremtidenshoder.no. 
      Made with three.js
-->

<div class="particlehead"></div>

.particlehead {
  background: linear-gradient(0turn,rgba(231,242,255,1) 0%,rgba(230,230,255,1) 100%);
  overflow: hidden;
  height: 100vh;
  width: 100vw;
}

h1 {
  font-size: 31px;
  color: #202022;
  font-family: Montserrat, sans-serif;
  position: absolute;
  left: 50%;
  top: 50%;
  text-transform: uppercase;
  font-weight: normal;
  margin-left: -364px;
  margin-top: -120px;
  pointer-events: none;
}

h1 strong {
  font-weight: 700;
}

h1 em {
  font-family: 'Playfair Display', serif;
  text-transform: lowercase;
  font-style: italic;
}

var site = site || {};
site.window = $(window);
site.document = $(document);
site.Width = site.window.width();
site.Height = site.window.height();

var Background = function() {

};

Background.headparticle = function() {   

   if ( !Modernizr.webgl ) {
      alert('Your browser dosent support WebGL');
   }

   var camera, scene, renderer;
   var mouseX = 0, mouseY = 0;
   var p;

   var windowHalfX = site.Width / 2;
   var windowHalfY = site.Height / 2;

   Background.camera = new THREE.PerspectiveCamera( 35, site.Width / site.Height, 1, 2000 );
   Background.camera.position.z = 300;

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

   // texture
   var manager = new THREE.LoadingManager();
   manager.onProgress = function ( item, loaded, total ) {
      //console.log('webgl, twice??');
      //console.log( item, loaded, total );
   };


   // particles
   var p_geom = new THREE.Geometry();
   var p_material = new THREE.ParticleBasicMaterial({
      color: 0xFFFFFF,
      size: 1.5
   });

   // model
   var loader = new THREE.OBJLoader( manager );
   loader.load( 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/40480/head.obj', function ( object ) {

      object.traverse( function ( child ) {

         if ( child instanceof THREE.Mesh ) {

            // child.material.map = texture;

            var scale = 8;

            $(child.geometry.vertices).each(function() {
               p_geom.vertices.push(new THREE.Vector3(this.x * scale, this.y * scale, this.z * scale));
            })
         }
      });

      Background.scene.add(p)
   });

   p = new THREE.ParticleSystem(
      p_geom,
      p_material
   );

   Background.renderer = new THREE.WebGLRenderer({ alpha: true });
   Background.renderer.setSize( site.Width, site.Height );
   Background.renderer.setClearColor(0x000000, 0);

   $('.particlehead').append(Background.renderer.domElement);
   $('.particlehead').on('mousemove', onDocumentMouseMove);
   site.window.on('resize', onWindowResize);

   function onWindowResize() {
      windowHalfX = site.Width / 2;
      windowHalfY = site.Height / 2;
      //console.log(windowHalfX);

      Background.camera.aspect = site.Width / site.Height;
      Background.camera.updateProjectionMatrix();

      Background.renderer.setSize( site.Width, site.Height );
   }

   function onDocumentMouseMove( event ) {
      mouseX = ( event.clientX - windowHalfX ) / 2;
      mouseY = ( event.clientY - windowHalfY ) / 2;
   }

   Background.animate = function() { 

      Background.ticker = TweenMax.ticker;
      Background.ticker.addEventListener("tick", Background.animate);

      render();
   }

   function render() {
      Background.camera.position.x += ( (mouseX * .5) - Background.camera.position.x ) * .05;
      Background.camera.position.y += ( -(mouseY * .5) - Background.camera.position.y ) * .05;

      Background.camera.lookAt( Background.scene.position );

      Background.renderer.render( Background.scene, Background.camera );
   }

   render();

   Background.animate();
};


Background.headparticle();