THREE.js: Errormessage消息"THREE.OBJLoader不是构造函数“

Question

我只是在学习three.js的用法。这似乎很好，但现在我有一个问题，我不能解决。

我想加载一个OBJ文件，这是我之前在blender中创建的。为此，我尝试使用THREE.OBJloader。我从http://mamboleoo.be/learnThree/复制了代码，但在第32行收到错误消息"THREE.OBJLoader不是一个构造函数“。

其他一切都很好:添加场景，添加材质，添加立方体，等等。

为了简单起见，下面是代码：

var renderer, scene, camera, banana;
var ww = window.innerWidth,
wh = window.innerHeight;

function init(){

renderer = new THREE.WebGLRenderer({canvas : document.getElementById('scene')});
renderer.setSize(ww,wh);

scene = new THREE.Scene();

camera = new THREE.PerspectiveCamera(50,ww/wh, 0.1, 10000 );
camera.position.set(0,0,500);
scene.add(camera);

//Add a light in the scene
directionalLight = new THREE.DirectionalLight( 0xffffff, 0.8 );
directionalLight.position.set( 0, 0, 350 );
directionalLight.lookAt(new THREE.Vector3(0,0,0));
scene.add( directionalLight );

//Load the obj file
loadOBJ();
}

var loadOBJ = function(){

//Manager from ThreeJs to track a loader and its status
var manager = new THREE.LoadingManager();
//Loader for Obj from Three.js
var loader = new THREE.OBJLoader( manager );
//Launch loading of the obj file, addBananaInScene is the callback when it's ready 
loader.load( 'http://mamboleoo.be/learnThree/demos/banana.obj', addBananaInScene);

};

var addBananaInScene = function(object){
banana = object;
//Move the banana in the scene
banana.rotation.x = Math.PI/2;
banana.position.y = -200;
banana.position.z = 50;
//Go through all children of the loaded object and search for a Mesh
object.traverse( function ( child ) {
    //This allow us to check if the children is an instance of the Mesh constructor
    if(child instanceof THREE.Mesh){
        child.material.color = new THREE.Color(0X00FF00);
        //Sometimes there are some vertex normals missing in the .obj files, ThreeJs will compute them
        child.geometry.computeVertexNormals();
    }
});
//Add the 3D object in the scene
scene.add(banana);
render();
};


var render = function () {
requestAnimationFrame(render);

//Turn the banana
banana.rotation.z += .01;

renderer.render(scene, camera);
};

init();

我希望，有人知道这可能是从哪里来的。

向您致敬，克里斯蒂安

Answer 1

当你从Codepen examples中复制时，总是去pen并检查'Settings‘下的，看看项目中使用的任何其他文件。

在您的例子中，作者使用的是OBJLoader.js，这就是OBJLoader构造函数的来源，而您没有引用它。因此，你得到了错误。包括引用，它应该是有效的。

Answer 2

您可以使用ObjectLoader.js

var objLoader = new THREE.ObjectLoader();

注意: OBJLoader不工作

Answer 3

导入OBJLoader -从‘./jsm/loaders/OBJLoader.js’导入{ OBJLoader }；

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