将带有 mtl 的 Blender obj 文件导入 ThreeJS

Question

我正在尝试将我在Blender中创建的对象文件导入到ThreeJS。我的Blender项目看起来像这样： 图像

我将其导出为波形，为了导入到ThreeJS，我使用了MTLLoader和OBJLoader，这是我的代码：

<script>
var container;
var camera, controls, scene, renderer, dragControls;
var lighting, ambient, keyLight, fillLight, backLight;
var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;
var keyboard = {};
var floor;
var objects = [];
var meshes = [];
var cameraParams = {speed: 0.1, turnSpeed: Math.PI * 0.5};
var raycaster = new THREE.Raycaster();
var mouse = new THREE.Vector2(1, 1), INTERSECTED;
init();
animate();
function init() {
container = document.createElement('div');
document.body.appendChild(container);
camera = new THREE.PerspectiveCamera(45, window.innerWidth/window.innerHeight, 0.1, 1000);
camera.position.set(0, 7, 25);
scene = new THREE.Scene();
ambient = new THREE.AmbientLight(0xffffff, 1.0);
scene.add(ambient);
keyLight = new THREE.DirectionalLight(new THREE.Color('hsl(30, 100%, 75%)'), 1.0);
keyLight.position.set(-100, 0, 100);
fillLight = new THREE.DirectionalLight(new THREE.Color('hsl(240, 100%, 75%)'), 0.75);
fillLight.position.set(100, 0, 100);
backLight = new THREE.DirectionalLight(0xffffff, 1.0);
backLight.position.set(100, 0, -100).normalize();
scene.add(keyLight);
scene.add(fillLight);
scene.add(backLight);
// load model
loadMesh('road', function(obj){
obj.position.y = 0;
obj.scale.x = 1;
obj.scale.y = 1;
obj.scale.z = 1;
addMesh(obj);
});
renderer = new THREE.WebGLRenderer();
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.setClearColor(new THREE.Color('hsl(0, 0%, 10%)'));
container.appendChild(renderer.domElement);

controls = new THREE.OrbitControls(camera, renderer.domElement);
controls.enableDamping = true;
controls.dampingFactor = 0.25;
controls.enableZoom = false;
dragControls = new THREE.DragControls(objects, camera, renderer.domElement);
dragControls.addEventListener('dragstart', function (event) {
event.object.material.emissive.set(0xaaaaaa);
controls.enabled = false;
});
dragControls.addEventListener('dragend', function (event) {
event.object.material.emissive.set(0x000000);
controls.enabled = true;
});
window.addEventListener('resize', onWindowResize, false);
window.addEventListener('keydown', keyDownEvent, false);
window.addEventListener('keyup', keyUpEvent, false);
window.addEventListener('mousemove', onMouseMove, false);
}
function addMesh(mesh) {
meshes.push(mesh);
scene.add(mesh);
}
function loadMesh(name, callback) {
var objLoader = new THREE.OBJLoader();
var matLoader = new THREE.MTLLoader();
matLoader.setPath('assets/');
matLoader.load('ROAD2.mtl', function(materials) {
materials.preload();
objLoader.setMaterials(materials);
objLoader.setPath('assets/');
objLoader.load('ROAD2.obj', function (obj) {
callback(obj);
});
});
}
function onWindowResize() {
camera.aspect = window.innerWidth/window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
function keyDownEvent(event) {
keyboard[event.keyCode] = true;
}
function keyUpEvent(event) {
keyboard[event.keyCode] = false;
}
function onMouseMove(event) {
event.preventDefault();
mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
mouse.y = -(event.clientY / window.innerHeight) * 2 + 1;
}
function animate() {
requestAnimationFrame(animate);
if (keyboard[37]) { // left arrow key
camera.rotation.y += cameraParams.turnSpeed;
}
if (keyboard[39]) { // right arrow key
camera.rotation.y -= cameraParams.turnSpeed;
}
controls.update();
render();
}
function render() {
renderer.render(scene, camera);
}
</script>

我的Blender场景很少在我的浏览器中加载，当它加载时，它没有任何纹理。大多数情况下，我的选项卡在加载任何内容之前崩溃，因为它占用了我所有的RAM(使用Firefox和http-server加载html(。我对问题是什么一无所知，无法在Google上找到任何东西，大多数示例都是带有材料和纹理的物体。 我的文件层次结构如下所示，以防万一很重要：

index.html
js/
DragControls1.js
MTLLoader.js
OBJLoader.js
OrbitControls.js
three.js
assets/
ROAD2.mtl
ROAD2.obj
cottage_textures.png
road_texture.png

任何帮助将不胜感激。

Answer 1

您的场景似乎有大约 7'000'000 个顶点，这不是一点点，而是有点太多了。
在 Blender 中，尝试在几个较小的对象中执行导出。例如，每个单独的街道，一棵树，其中一所房屋等。 使用此方法，您可以接近场景的极限。

另外，尝试在代码中复制场景中的多个对象，而不是在Blender中执行此操作！

(在实时 3D 应用程序中，您应该始终尝试使用最佳 3D 模型(几何、拓扑(，而不是具有数百万个顶点的超大模型(