粒子海浪

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var SEPARATION = 100, AMOUNTX = 50, AMOUNTY = 50;
var container;
var camera, scene, renderer;
var particles, particle, count = 0;
var mouseX = 0, mouseY = 0;
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 1;
init();
animate();
function init() {
  container = document.getElementById( 'waves' );
  camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 1, 10000 );
  camera.position.z = 1000;
  scene = new THREE.Scene();
  particles = new Array();
  var PI2 = Math.PI * 2;
  var material = new THREE.SpriteCanvasMaterial( {
    color: 0xe41656,
    fill: 0xe41656,
    program: function ( context ) {
      context.beginPath();
      context.arc( 0, 0, 0.5, 0, PI2, true );
      context.fill();
    }
  } );
  var i = 0;
  for ( var ix = 0; ix < AMOUNTX; ix ++ ) {
    for ( var iy = 0; iy < AMOUNTY; iy ++ ) {
      particle = particles[ i ++ ] = new THREE.Sprite( material );
      particle.position.x = ix * SEPARATION - ( ( AMOUNTX * SEPARATION ) / 2 );
      particle.position.z = iy * SEPARATION - ( ( AMOUNTY * SEPARATION ) / 2 );
      scene.add( particle );
    }
  }
  renderer = new THREE.CanvasRenderer();
  renderer.setPixelRatio( window.devicePixelRatio );  
  renderer.setSize( window.innerWidth, window.innerHeight, false ); // false sets size to container
  container.appendChild( renderer.domElement );
  
  // stats = new Stats();
  // container.appendChild( stats.dom );
  document.addEventListener( 'mousemove', onDocumentMouseMove, false );
  document.addEventListener( 'touchstart', onDocumentTouchStart, false );
  document.addEventListener( 'touchmove', onDocumentTouchMove, false );
  //
  window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize() {
  windowHalfX = window.innerWidth / 2;
  windowHalfY = window.innerHeight / 2;
  camera.aspect = window.innerWidth / window.innerHeight;
  camera.updateProjectionMatrix();
  renderer.setSize( window.innerWidth, window.innerHeight, false );
}
//
function onDocumentMouseMove( event ) {
  mouseX = event.clientX - windowHalfX;
  mouseY = event.clientY - windowHalfY;
}
function onDocumentTouchStart( event ) {
  if ( event.touches.length === 1 ) {
    event.preventDefault();
    mouseX = event.touches[ 0 ].pageX - windowHalfX;
    mouseY = event.touches[ 0 ].pageY - windowHalfY;
  }
}
function onDocumentTouchMove( event ) {
  if ( event.touches.length === 1 ) {
    event.preventDefault();
    mouseX = event.touches[ 0 ].pageX - windowHalfX;
    mouseY = event.touches[ 0 ].pageY - windowHalfY;
  }
}
//
function animate() {
  requestAnimationFrame( animate );
  render();
  stats.update();
}
function render() {
  camera.position.x += ( mouseX - camera.position.x ) * .05;
  camera.position.y += ( - mouseY - camera.position.y ) * .05;
  camera.lookAt( scene.position );
  var i = 0;
  for ( var ix = 0; ix < AMOUNTX; ix ++ ) {
    for ( var iy = 0; iy < AMOUNTY; iy ++ ) {
      particle = particles[ i++ ];
      particle.position.y = ( Math.sin( ( ix + count ) * 0.3 ) * 50 ) +
        ( Math.sin( ( iy + count ) * 0.5 ) * 50 );
      particle.scale.x = particle.scale.y = ( Math.sin( ( ix + count ) * 0.3 ) + 1 ) * 4 +
        ( Math.sin( ( iy + count ) * 0.5 ) + 1 ) * 4;
    }
  }
  renderer.render( scene, camera );
  renderer.setClearColorHex( 0xffffff, 0 );
  count += 0.1;
}

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