变换 Box3 ·Box3 Helper· ▶ 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Box3.setFromObject计算物体世界空间 AABBBox3Helper可视化黄色包围盒TransformControlschange事件驱动包围盒刷新效果说明Fox 模型挂载 TransformControls拖拽时黄色线框包围盒跟随更新直观看到物体占用空间。核心概念const box3 new THREE.Box3();const box3Helper new THREE.Box3Helper(box3, 0xffff00); scene.add(box3Helper);transformControls.addEventListener(change, () { box3Helper.box box3.setFromObject(transformControls.object); });AABB轴对齐包围盒不随物体旋转而旋转始终与世界轴平行适合碰撞粗测、视图 fit。代码要点import * as THREE from threeimport { OrbitControls } from three/examples/jsm/controls/OrbitControls.js import { GLTFLoader } from three/addons/loaders/GLTFLoader.js import { TransformControls } from three/examples/jsm/controls/TransformControls.js import { RGBELoader } from three/examples/jsm/loaders/RGBELoader.js import { GUI } from three/addons/libs/lil-gui.module.min.js;const box document.getElementById(box)const scene new THREE.Scene()const camera new THREE.PerspectiveCamera(50, box.clientWidth / box.clientHeight, 0.1, 1000)camera.position.set(0, 3, 6)const renderer new THREE.WebGLRenderer({ antialias: true, alpha: true, logarithmicDepthBuffer: true })renderer.setSize(box.clientWidth, box.clientHeight)renderer.shadowMap.needsUpdate truerenderer.shadowMap.enabled truebox.appendChild(renderer.domElement)const controls new OrbitControls(camera, renderer.domElement)controls.enableDamping trueconst folder new GUI()// 变换控制器 const transformControls new TransformControls(camera, renderer.domElement)folder.add(transformControls, mode, [translate, rotate, scale]).name(模式)const transformControlsRoot transformControls.getHelper()transformControls.addEventListener(dragging-changed, event controls.enabled !event.value)const box3 new THREE.Box3()const box3Helper new THREE.Box3Helper(box3, 0xffff00)scene.add(box3Helper)transformControls.addEventListener(change, () box3Helper.box box3.setFromObject(transformControls.object))scene.add(transformControlsRoot)// 模型 const texture new RGBELoader().load(FILE_HOST /files/hdr/1k.hdr, t t.mapping THREE.EquirectangularReflectionMapping)new GLTFLoader().load(GLOBAL_CONFIG.getFileUrl(files/model/Fox.glb), (gltf) {const model gltf.scenemodel.scale.set(0.01, 0.01, 0.01)model.traverse((child) child.isMesh (child.material.envMap texture))scene.add(model)transformControls.attach(model)})animate()function animate() {requestAnimationFrame(animate)controls.update()renderer.render(scene, camera)}完整源码GitHub小结本文提供变换 Box3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