模型边框 ·Model Border· ▶ 在线运行案例案例合集三维可视化功能案例threehub.cn开源仓库github地址https://github.com/z2586300277/three-cesium-examples400个案例代码:网盘链接你将学到什么OrbitControls 相机轨道交互glTF/Draco 模型加载与优化BufferGeometry 自定义顶点/索引数据EdgesGeometry 模型边线提取requestAnimationFrame渲染循环与resize自适应效果说明本案例演示模型边框效果基于 WebGL 实现「模型边框」可视化效果附完整可运行源码核心用到 OrbitControls、glTF/Draco、BufferGeometry。建议先打开文首在线案例查看动态画面再对照下方源码逐步理解。核心概念Scene / Camera / WebGLRenderer构成最小渲染闭环大场景可开logarithmicDepthBuffer缓解 Z-fighting。OrbitControls提供轨道旋转/缩放开启enableDamping后需在 animate 中controls.update()。阅读下方完整源码时建议从init/load/animate三条主线入手再深入 shader 与工具函数。实现步骤搭建 Scene、PerspectiveCamera、WebGLRenderer挂载 canvas 并处理resize异步加载模型 / 3D Tiles / GeoJSON 等资源并加入 scene 或 entities创建 OrbitControls及 Raycaster 等交互控件若源码包含在requestAnimationFrame循环中更新状态并 renderCesium 为viewer.render或自动渲染代码要点import * as THREE from threeimport { OrbitControls } from three/examples/jsm/controls/OrbitControls.js import { GLTFLoader } from three/examples/jsm/loaders/GLTFLoader.js import { DRACOLoader } from three/examples/jsm/loaders/DRACOLoader.js import { BufferGeometry, EdgesGeometry } from three; import { mergeAttributes } from three/addons/utils/BufferGeometryUtils.js;class MeshEdgesGeometry extends BufferGeometry {constructor(object, thresholdAngle 1) {super();object.updateWorldMatrix(true, true);var position this.extractEdges(object, thresholdAngle);this.setAttribute(position, position);} // MeshEdgesGeometry.constructorextractEdges(object, thresholdAngle) {var attributes [];object.traverse(child {if (child.geometry) {var geo new EdgesGeometry(child.geometry, thresholdAngle); var pos geo.getAttribute(position);attributes.push(pos.applyMatrix4(child.matrixWorld));} // if}); // object.traverseif (attributes.length 0) {throw MeshEdgesGeometry: No edges found;}return mergeAttributes(attributes);} // MeshEdgesGeometry.extractEdges} // MeshEdgesGeometryconst box document.getElementById(box)const scene new THREE.Scene()const camera new THREE.PerspectiveCamera(75, box.clientWidth / box.clientHeight, 0.1, 100000)camera.position.set(10, 10, 12)const renderer new THREE.WebGLRenderer({ antialias: true, alpha: true, logarithmicDepthBuffer: true })renderer.setSize(box.clientWidth, box.clientHeight)box.appendChild(renderer.domElement)new OrbitControls(camera, renderer.domElement)window.onresize () {renderer.setSize(box.clientWidth, box.clientHeight)camera.aspect box.clientWidth / box.clientHeightcamera.updateProjectionMatrix()}animate()function animate() {requestAnimationFrame(animate)renderer.render(scene, camera)}const loader new GLTFLoader()loader.setDRACOLoader(new DRACOLoader().setDecoderPath(FILE_HOST js/three/draco/))loader.load(FILE_HOST files/model/elegant.glb,gltf {const model new THREE.LineSegments(new MeshEdgesGeometry(gltf.scene), new THREE.LineBasicMaterial({ color: pink }));scene.add(model)})完整源码GitHub小结本文提供模型边框完整 Three.js 源码与在线 Demo建议先运行案例再改 uniform/参数做二次实验更多 Three.js 实战案例见 three-cesium-examples 合集 与 GitHub 开源仓库
