使用three.js 实现一个马赛克得 shader

使用three.js 实现一个马赛克得 shader
在这里插入图片描述

源链接：https://threehub.cn/#/codeMirror?navigation=ThreeJS&classify=shader&id=mosaicShader

国内站点预览：http://threehub.cn

github地址: https://github.com/z2586300277/three-cesium-examples

import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js'
import * as dat from 'dat.gui'const box = document.getElementById('box')const scene = new THREE.Scene()const camera = new THREE.PerspectiveCamera(75, box.clientWidth / box.clientHeight, 0.1, 1000)camera.position.set(0, 0, 1)const renderer = new THREE.WebGLRenderer()renderer.setSize(box.clientWidth, box.clientHeight)box.appendChild(renderer.domElement)new OrbitControls(camera, renderer.domElement)animate()function animate() {requestAnimationFrame(animate)renderer.render(scene, camera)}window.onresize = () => {renderer.setSize(box.clientWidth, box.clientHeight)camera.aspect = box.clientWidth / box.clientHeightcamera.updateProjectionMatrix()}const vertexShader = ` varying vec2 vUv;void main(){vUv = uv;gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
}`const fragmentShader = `varying vec2 vUv;uniform sampler2D tDiffuse;uniform vec2 vScreenSize;uniform float fMosaicScale;void main() {vec2 vUv2 = vUv;vUv2.x = floor(vUv2.x * vScreenSize.x / fMosaicScale) / (vScreenSize.x / fMosaicScale) + (fMosaicScale / 2.0) / vScreenSize.x;vUv2.y = floor(vUv2.y * vScreenSize.y / fMosaicScale) / (vScreenSize.y / fMosaicScale) + (fMosaicScale / 2.0) / vScreenSize.y;vec4 color = texture2D(tDiffuse, vUv2);gl_FragColor = color;
}`const uniforms = {tDiffuse: { type: 't', value: new THREE.TextureLoader().load(`https://threehub.cn/` + 'files/author/z2586300277.png') },vScreenSize: { type: "v2", value: new THREE.Vector2(window.innerWidth, window.innerHeight) },fMosaicScale: { type: "f", value: 20.0 },}const material = new THREE.ShaderMaterial({ uniforms, vertexShader, fragmentShader });const geometry = new THREE.PlaneGeometry();const mesh = new THREE.Mesh(geometry, material);scene.add(mesh);var gui = new dat.GUI();
gui.add(uniforms['fMosaicScale'], 'value', 1.0, 100.0).step(1.0).name('mosaicScale');/*** 名称: 马赛克* 作者: 优雅永不过时 https://github.com/z2586300277
*/