几何体居中与获取几何体中心
代码
js
import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js'
import { GUI } from 'three/examples/jsm/libs/lil-gui.module.min.js';
import { RGBELoader } from 'three/examples/jsm/loaders/RGBELoader.js';
import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader.js';
import { DRACOLoader } from 'three/examples/jsm/loaders/DRACOLoader.js';
const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(
45,
window.innerWidth / window.innerHeight,
0.1,
1000
)
const renderer = new THREE.WebGLRenderer()
renderer.setSize(window.innerWidth, window.innerHeight)
document.body.appendChild(renderer.domElement)
camera.position.z = 5;
camera.position.y = 2;
camera.position.x = 2;
camera.lookAt(0, 0, 0)
const axesHelper = new THREE.AxesHelper(5);
scene.add(axesHelper);
const controls = new OrbitControls(camera, renderer.domElement);
controls.enableDamping = true;
controls.dampingFactor = 0.05;
function animate() {
requestAnimationFrame(animate)
controls.update()
renderer.render(scene, camera)
}
animate()
window.addEventListener('resize', () => {
renderer.setSize(window.innerWidth, innerHeight)
camera.aspect = window.innerWidth / window.innerHeight
camera.updateProjectionMatrix()
})
let eventObj = {
Fullscreen: function () {
document.body.requestFullscreen()
},
ExitFullscreen: function () {
document.exitFullscreen()
}
}
const gui = new GUI()
gui.add(eventObj, 'Fullscreen').name('全屏')
gui.add(eventObj, 'ExitFullscreen').name('退出全屏')
const gltfLoader = new GLTFLoader()
gltfLoader.load(
'./model/Duck.glb',
(gltf) => {
scene.add(gltf.scene)
let duckMesh = gltf.scene.getObjectByName('LOD3spShape')
let duckGeometry = duckMesh.geometry;
// 计算包围盒
duckGeometry.computeBoundingBox();
// 设置几何体居中
duckGeometry.center()
// 获取 duck 的包围盒
let duckBox = duckGeometry.boundingBox;
// 更新世界矩阵
duckMesh.updateWorldMatrix(true, true);
// 更新包围盒
duckBox.applyMatrix4(duckMesh.matrixWorld)
// 获取包围盒中心点:需要传递一个三维的空向量
let center = duckBox.getCenter(new THREE.Vector3())
console.log(center) // 如果处于中心是 0, 0, 0
// 创建包围盒辅助器
let boxHelper = new THREE.Box3Helper(duckBox, 0xffff00);
// 添加包围盒辅助器
scene.add(boxHelper);
// 获取包围球
let duckSphere = duckGeometry.boundingSphere;
duckSphere.applyMatrix4(duckMesh.matrixWorld);
// 创建包围球辅助器
let sphereGeometry = new THREE.SphereGeometry(
duckSphere.radius,
16,
16
)
let sphereMaterial = new THREE.MeshBasicMaterial({
color: 0xff0000,
wireframe: true
})
let sphereMesh = new THREE.Mesh(sphereGeometry, sphereMaterial)
sphereMesh.position.copy(duckSphere.center)
scene.add(sphereMesh)
}
)
let rgbeLoader = new RGBELoader()
rgbeLoader.load(
'./texture/Alex_Hart-Nature_Lab_Bones_2k.hdr',
envMap => {
envMap.mapping = THREE.EquirectangularReflectionMapping
scene.background = envMap
scene.environment = envMap
}
)
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