几何体顶点转化_顶点位移_旋转_缩放
介绍
顶点变换是几何体变换的基础,顶点变换可以实现几何体的平移、旋转、缩放等操作。 一般直接对物体直接进行转换,而不对顶点进行操作,因为无法在数据查找到变换后的顶点数据。
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';
import * as TWEEN from 'three/examples/jsm/libs/tween.module.js';
import { VertexNormalsHelper } from 'three/examples/jsm/helpers/VertexNormalsHelper.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)
let uvTexture = new THREE.TextureLoader().load('./texture/uv_grid_opengl.jpg')
const planeGeometry = new THREE.PlaneGeometry(2, 2)
const planeMaterial = new THREE.MeshBasicMaterial({
map: uvTexture,
side: THREE.DoubleSide,
})
const planeMesh = new THREE.Mesh(planeGeometry, planeMaterial)
scene.add(planeMesh)
planeMesh.position.x = -3
const geometry = new THREE.BufferGeometry()
const vertices = new Float32Array([
-1.0, -1.0, 0.0,
1.0, -1.0, 0.0,
1.0, 1.0, 0.0,
-1.0, 1.0, 0
])
geometry.setAttribute('position', new THREE.BufferAttribute(vertices, 3))
const indices = new Uint16Array([0, 1, 2, 2, 3, 0])
geometry.setIndex(new THREE.BufferAttribute(indices, 1))
const uv = new Float32Array([
0, 0, 1, 0, 1, 1, 0, 1,
])
geometry.setAttribute('uv', new THREE.BufferAttribute(uv, 2))
const normals = new Float32Array([
0,
0,
1,
0,
0,
1,
0,
0,
1,
0,
0,
1,
])
geometry.setAttribute('normal', new THREE.BufferAttribute(normals, 3))
// 顶点转换
geometry.translate(4, 0, 0)
// 顶点旋转
geometry.rotateX(Math.PI / 4)
// 顶点放大3倍
geometry.scale(3, 3, 3)
const material = new THREE.MeshBasicMaterial({
map: uvTexture,
side: THREE.DoubleSide,
})
const plane = new THREE.Mesh(geometry, material)
scene.add(plane)
// plane.position.x = 3
const helper = new VertexNormalsHelper(plane, 0.2, 0xff0000)
scene.add(helper)
camera.position.z = 15;
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)
TWEEN.update()
}
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')
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
planeMaterial.envMap = envMap
material.envMap = envMap
})
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