[英]How to add a material (.mtl) to an object (.obj) using three.js?
我已经成功地从网上找到的一段代码中使用 three.js 显示了一个 .obj 文件,我根据自己的需要进行了调整。 但是我现在尝试添加 .mtl 材料文件并且卡住了。
我已经尝试了一些东西,但似乎没有任何效果。 我是 three.js 的新手,所以我肯定在这里误解了一些东西......
这是我正在使用的当前代码,可以很好地显示 my.obj 文件:
var renderer, scene, camera, Nefertiti;
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, addNefertitiInScene is the callback when it's ready
loader.load( '/mypath/Nefertiti-3d.obj', addNefertitiInScene);
};
var addNefertitiInScene = function(object){
Nefertiti = object;
//Move the Nefertiti in the scene
Nefertiti.scale.set(0.7,0.7,0.7);
Nefertiti.rotation.x = 0.5;
Nefertiti.rotation.y = 5.5;
Nefertiti.rotation.z = 0.2;
Nefertiti.position.y = -40;
Nefertiti.position.z = 1;
//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(0XFFFFFF);
//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(Nefertiti);
var canvas = renderer.domElement;
canvas.addEventListener('mousemove', onMouseMove);
function animate() {
requestAnimationFrame( animate );
renderer.render( scene, camera );
}
animate();
function onMouseMove(event) {
Nefertiti.rotation.y += event.movementX * 0.001;
Nefertiti.rotation.x += event.movementY * 0.0005;
}
};
init();
这是我尝试添加的一个片段以加载不起作用的 mtl 文件(我刚刚缩短了 /mypath/ 的实际路径以保持此处的整洁)
var loadOBJ = function(){
var mtlLoader = new THREE.MTLLoader();
mtlLoader.setBaseUrl( '/mypath/' );
mtlLoader.setPath( '/mypath/' );
var url = "/mypath/Nefertiti-3d.mtl";
mtlLoader.load( url, function( materials ) {
materials.preload();
//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 );
loader.setMaterials( materials );
loader.setPath( '/mypath/' );
//Launch loading of the obj file, addNefertitiInScene is the callback when it's ready
loader.load( '/mypath/Nefertiti-3d.obj', addNefertitiInScene);
object.position.y = - 95;
scene.add( object );
}, onProgress, onError );
};
通过研究,我可以看到材料必须有一个网格才能工作,但我无法从任何文档中弄清楚如何正确实现它。
在能够将 mtl 文件添加到我的代码中的任何帮助将不胜感激!
**编辑**
因此,我根据 Mugen87 的建议将代码片段更改为以下内容:
var loadOBJ = function(){
var mtlLoader = new THREE.MTLLoader();
mtlLoader.setPath( '/mypath/' );
var url = "/mypath/Nefertiti-3d.mtl";
mtlLoader.load( url, function( materials ) {
materials.preload();
//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 );
loader.setMaterials( materials );
loader.setPath( '/mypath/' );
//Launch loading of the obj file, addNefertitiInScene is the callback when it's ready
loader.load( '/mypath/Nefertiti-3d.obj', addNefertitiInScene);
}, onProgress, onError );
};
而且我还包含了 three.js 示例中的 MTLLoader.js(我不确定这是否正确,我发现很难找到这方面的信息)并且在控制台中收到以下错误:
Uncaught SyntaxError: Cannot use import statement outside a module
(index):136 Uncaught TypeError: THREE.MTLLoader is not a constructor
at loadOBJ ((index):136)
at init ((index):132)
at (index):199
loadOBJ @ (index):136
init @ (index):132
(anonymous) @ (index):199
有任何想法吗? 我在代码中的 MTL 有什么问题吗?
object.position.y = - 95;
scene.add( object );
我想您已经复制了官方 OBJ/MTL 示例中的两行代码,对吧? 不幸的是,它们在这里没有意义,因为object
是undefined
。 请记住, addNefertitiInScene
是您的onLoad()
回调,它负责将加载的 object 添加到场景中。
此外, mtlLoader.setBaseUrl( '/mypath/' );
应该没有必要。 该方法在不久前被删除。
还要确保使用浏览器的开发工具实际加载了 MTL 文件。
three.js R109
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