Canvas贴图 ·Canvas Texture· ▶ 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onBeforeCompile 注入 GLSL 改造内置材质OrbitControls 相机轨道交互Canvas 动态纹理贴图ECharts 与 WebGL 场景联动requestAnimationFrame渲染循环与resize自适应效果说明本案例演示Canvas贴图效果用 Canvas 2D 绘制内容并实时映射为 Three.js 纹理ECharts 图表与 Three.js 场景同屏联动展示核心用到 onBeforeCompile、OrbitControls、Canvas。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。onBeforeCompile在 Three 拼好内置 shader 后替换#include片段适合在 PBR 材质上叠加大屏特效。OrbitControls提供轨道旋转/缩放开启enableDamping后需在 animate 中controls.update()。CanvasTexture每帧或按需把 2D Canvas 内容上传 GPU适合动态文字、图表、视频帧贴图。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定时器或 GSAP 时间轴中更新 uniform / 变换驱动特效播放在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.js import * as echarts from echartsconst box document.getElementById(box)const scene new THREE.Scene()const camera new THREE.PerspectiveCamera(75, box.clientWidth / box.clientHeight, 0.1, 100000)camera.position.set(0, 0, 3)const renderer new THREE.WebGLRenderer({ antialias: true, alpha: true, logarithmicDepthBuffer: true })renderer.setSize(box.clientWidth, box.clientHeight)box.appendChild(renderer.domElement)new OrbitControls(camera, renderer.domElement)const w 800, h 600 const container document.createElement(canvas) // 设置实际尺寸而不是CSS尺寸 container.width w container.height h // 保持CSS尺寸以便echarts正确初始化 container.style.width w px container.style.height h pxconst myChart echarts.init(container, null, { devicePixelRatio: window.devicePixelRatio // 使用正确的设备像素比 }) const texture new THREE.CanvasTexture(container) // 设置贴图过滤模式以提高清晰度 texture.minFilter THREE.LinearFilter texture.magFilter THREE.LinearFilter// 计算保持纵横比的平面尺寸 const aspectRatio w / h const planeWidth 4 const planeHeight planeWidth / aspectRatio const planeGeometry new THREE.PlaneGeometry(planeWidth, planeHeight) const planeMaterial new THREE.MeshBasicMaterial({ map: texture, side: THREE.DoubleSide, transparent: true }) const plane new THREE.Mesh(planeGeometry, planeMaterial) scene.add(plane)const uniforms { iResolution: { type: v2, value: new THREE.Vector2(box.clientWidth, box.clientHeight) }, iTime: { type: f, value: 1.0 } } planeMaterial.onBeforeCompile shader { shader.uniforms.iResolution uniforms.iResolution shader.uniforms.iTime uniforms.iTime shader.fragmentShader shader.fragmentShader.replace(/#include /,uniform vec2 iResolution; uniform float iTime; #include) shader.fragmentShader shader.fragmentShader.replace(vec4 diffuseColor vec4( diffuse, opacity );,vec3 c; float l,ziTime; for(int i0;i3;i) { vec2 uv,pgl_FragCoord.xy/iResolution; uvp 2.0; p-.5; p.x*iResolution.x/iResolution.y; z.07; llength(p); uvp/l(sin(z)1.)abs(sin(l*9.-z-z)); c[i].01/length(mod(uv,1.)-.5); } vec4 diffuseColor vec4( diffusecvec3(8.,8.,8.), opacity );) }animate()function animate() { texture.needsUpdate true uniforms.iTime.value 0.05 requestAnimationFrame(animate) renderer.render(scene, camera)}const data [820, 932, 901, 934, 1290, 1330, 1320] const option { xAxis: { type: category, data: [Mon, Tue, Wed, Thu, Fri, Sat, Sun] }, yAxis: { type: value }, series: [ { data, type: line, areaStyle: {} } ] } myChart.setOption(option) setInterval(() { data.forEach((item, index) { data[index] Math.floor(Math.random() * 1000) }) myChart.setOption({ series: [{ data: data }] }) }, 2000)完整源码GitHub小结本文提供Canvas贴图完整 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