three.js加载obj模型的实例代码

<!DOCTYPE html>
<html>
  <head>
    <script type="text/javascript" src="libs/three.js"></script>
    <script type="text/javascript" src="libs/OBJLoader.js"></script>
    <script type="text/javascript">
      var scene = null;
      var camera = null;
      var renderer = null;
      var mesh = null;
      var id = null;
      function init() {
        renderer = new THREE.WebGLRenderer({//渲染器
          canvas: document.getElementById('mainCanvas')//画布
        });
        renderer.setClearColor(0x000000);//画布颜色
        scene = new THREE.Scene();//创建场景
        camera = new THREE.OrthographicCamera(-5, 5, 3.75, -3.75, 0.1, 100);//正交投影照相机
        camera.position.set(15, 25, 25);//相机位置
        camera.lookAt(new THREE.Vector3(0, 2, 0));//lookAt()设置相机所看的位置
        scene.add(camera);//把相机添加到场景中
        var loader = new THREE.OBJLoader();//在init函数中，创建loader变量，用于导入模型
        loader.load('libs/port.obj', function(obj) {//第一个表示模型路径，第二个表示完成导入后的回调函数，一般我们需要在这个回调函数中将导入的模型添加到场景中
          obj.traverse(function(child) {
            if (child instanceof THREE.Mesh) {
              child.material.side = THREE.DoubleSide;
            }
          });
          mesh = obj;//储存到全局变量中
          scene.add(obj);//将导入的模型添加到场景中
        });
        var light = new THREE.DirectionalLight(0xffffff);//光源颜色
        light.position.set(20, 10, 5);//光源位置
        scene.add(light);//光源添加到场景中
        id = setInterval(draw, 20);//每隔20s重绘一次
      }
      function draw() {//们在重绘函数中让茶壶旋转：
        renderer.render(scene, camera);//调用WebGLRenderer的render函数刷新场景
        mesh.rotation.y += 0.01;//添加动画
        if (mesh.rotation.y > Math.PI * 2) {
          mesh.rotation.y -= Math.PI * 2;
        }
      }
    </script>
  </head>
  <body onload="init()">
    <canvas id="mainCanvas" width="800px" height="600px" ></canvas>
  </body>
</html>

// model
var onProgress = function(xhr) {
  if (xhr.lengthComputable) {
    var percentComplete = xhr.loaded / xhr.total * 100;
    console.log(Math.round(percentComplete, 2) + '% downloaded');
  }
};
var onError = function(xhr) {};
THREE.Loader.Handlers.add(/\.dds$/i, new THREE.DDSLoader());
var mtlLoader = new THREE.MTLLoader();
mtlLoader.setPath('/uploads/160601/obj/');
mtlLoader.load('egg.mtl', function(materials) {
  materials.preload();
  var objLoader = new THREE.OBJLoader();
  objLoader.setMaterials(materials);
  objLoader.setPath('/uploads/160601/obj/');
  objLoader.load('egg.obj', function(object) {
    object.position.y = -0.5;
    scene.add(object);
  }, onProgress, onError);
});