html5-canvas – 将三个动画放在div内

这是three.js动画代码示例：

<script defer="defer">
  var angularspeed = 0.2; 
  var lastTime = 0;
  function animate(){
    var time = (new Date()).getTime();
    var timeDiff = time - lastTime;
    var angleChange = angularspeed * timeDiff * 2 * Math.PI / 1000;
    plane.rotation.z += angleChange;
    lastTime = time;
    renderer.render(scene,camera);
    requestAnimationFrame(function(){
        animate();
    });
  }
  var renderer = new THREE.Webglrenderer();
  renderer.setSize(window.innerWidth,window.innerHeight);
  document.body.appendChild(renderer.domElement);
  var camera = new THREE.PerspectiveCamera(45,window.innerWidth / window.innerHeight,1,1000);
  camera.position.y = -450;
  camera.position.z = 400;
  camera.rotation.x = 45 * (Math.PI / 180);
  var scene = new THREE.Scene();
  var plane = new THREE.Mesh(new THREE.PlaneGeometry(300,300),new THREE.MeshnormalMaterial());
  plane.overdraw = true;
  scene.add(plane);
  animate();
 </script>

我想通过div id将这个动画代码绑定到一些特定的div.所以,动画会显示在div里面.这将允许我轻松地使用css操纵动画位置.我在想这样的事情：

HTML：

<canvas id="myCanvas" width="578" height="200"></canvas>

JavaScript的：

var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
// do stuff here

但是我没有找到一种方法来做这样的事情与three.js.如代码示例所示,没有可以引用的canvas元素.有任何想法吗？

解决方法

您可以使用如下所示的模式：

<div id="canvas">

#canvas {
    background-color: #000;
    width: 200px;
    height: 200px;
    border: 1px solid black;
    margin: 100px;
    padding: 0px;
    position: static; /* fixed or static */
    top: 100px;
    left: 100px;
}

container = document.getElementById( 'canvas' );
document.body.appendChild( container );

renderer = new THREE.Webglrenderer();
renderer.setSize( 200,200 );
container.appendChild( renderer.domElement );

小提琴：http://jsfiddle.net/fek9ddg5/1/

另见THREE.js Ray Intersect fails by adding div

three.js r.69