Three.js的THREE.LOD如何加载gltf模型
要在Three.js中使用THREE.LOD加载gltf模型,可以按照以下步骤操作:
1、首先,确保已经引入了Three.js库和GLTFLoader插件。可以通过以下方式引入:
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/controls/OrbitControls.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/loaders/GLTFLoader.js"></script>
2、创建一个场景、相机和渲染器:
const scene = new THREE.Scene(); const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000); const renderer = new THREE.WebGLRenderer(); renderer.setSize(window.innerWidth, window.innerHeight); document.body.appendChild(renderer.domElement);
3、添加控制器以方便操作:
const controls = new THREE.OrbitControls(camera, renderer.domElement);
4、使用GLTFLoader加载gltf模型:
const loader = new THREE.GLTFLoader(); loader.load('path/to/your/model.gltf', (gltf) => { scene.add(gltf.scene); });
5、创建LOD对象并设置层次:
const lod = new THREE.LOD(); lod.addLevel(gltf.scene, 0); // 基本层次,包含所有细节 lod.addLevel(new THREE.Mesh(new THREE.BoxGeometry(), new THREE.MeshBasicMaterial({ color: 0xff0000 })), 1000); // 高细节层次,仅包含红色盒子 lod.addLevel(new THREE.Mesh(new THREE.SphereGeometry(50), new THREE.MeshBasicMaterial({ color: 0x00ff00 })), 2000); // 低细节层次,仅包含绿色球体 scene.add(lod);
6、更新LOD对象的显示级别:
function updateLod() { const distance = camera.position.distanceTo(lod.object3D.position); lod.updateMatrixWorld(); if (distance > 1000) { lod.displayLevel = 0; } else if (distance > 2000) { lod.displayLevel = 1; } else { lod.displayLevel = 2; } } updateLod(); camera.addEventListener('change', updateLod);
7、渲染循环:
function animate() { requestAnimationFrame(animate); renderer.render(scene, camera); } animate();
这样,就可以在Three.js中使用THREE.LOD加载gltf模型了。