Three.js 灰度教程

灰度 ·Gray Shader· ▶ 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ShaderMaterial 自定义着色器实现核心视觉效果OrbitControls 相机轨道交互requestAnimationFrame渲染循环与resize自适应效果说明本案例演示灰度效果基于 WebGL 实现「灰度」可视化效果附完整可运行源码核心用到 ShaderMaterial、OrbitControls。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。ShaderMaterial通过uniforms 自定义 GLSL 控制逐像素/逐点效果透明粒子常配合depthTest: false。OrbitControls提供轨道旋转/缩放开启enableDamping后需在 animate 中controls.update()。实现步骤搭建 Scene、PerspectiveCamera、WebGLRenderer挂载 canvas 并处理resize定义 uniforms / onBeforeCompile 或 ShaderMaterial编写 GLSL 与材质参数创建 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.jsconst 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 projectionMatrixmodelViewMatrixvec4(position, 1.0); }const fragmentShader #define R_LUMINANCE 0.298912 #define G_LUMINANCE 0.586611 #define B_LUMINANCE 0.114478varying vec2 vUv; uniform sampler2D tDiffuse; const vec3 monochromeScale vec3(R_LUMINANCE, G_LUMINANCE, B_LUMINANCE);void main() { vec4 color texture2D(tDiffuse, vUv); float grayColor dot(color.rgb, monochromeScale); color vec4(vec3(grayColor), 1.0); gl_FragColor vec4(color); }const uniforms {tDiffuse: { type: t, value: new THREE.TextureLoader().load(HOST files/author/z2586300277.png) }}const material new THREE.ShaderMaterial({ uniforms, vertexShader, fragmentShader });const geometry new THREE.PlaneGeometry();const mesh new THREE.Mesh(geometry, material);scene.add(mesh);完整源码GitHub小结本文提供灰度完整 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