平面扫描 ·Plane Scan· ▶ 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requestAnimationFrame渲染循环与resize自适应效果说明本案例演示平面扫描效果基于 WebGL 实现「平面扫描」可视化效果附完整可运行源码核心用到 onBeforeCompile、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。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()。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(50, box.clientWidth / box.clientHeight, 0.1, 1000)camera.position.set(0, 2, 2)const renderer new THREE.WebGLRenderer({ antialias: true, alpha: true, logarithmicDepthBuffer: true })renderer.outputColorSpace THREE.LinearSRGBColorSpacerenderer.setSize(box.clientWidth, box.clientHeight)box.appendChild(renderer.domElement)const controls new OrbitControls(camera, renderer.domElement)controls.enableDamping trueconst plane new THREE.PlaneGeometry(5,5)const map new THREE.TextureLoader().load(https://z2586300277.github.io/three-editor/dist/files/channels/texture.jpg)const material new THREE.MeshBasicMaterial({ color: 0xffffff, side: THREE.DoubleSide, map , transparent: true })const mesh new THREE.Mesh(plane, material)const uniforms {innerCircleWidth: { value: 0.59, type: number, unit: float },circleWidth: { value: 0.2, type: number, unit: float },circleMax: { value: 0.7, type: number, unit: float },opacityScale: { value: 0.8, type: number, unit: float },reverseOpacity: { value: false, type: bool, unit: bool },circleSpeed: { value: 0.003, type: number, unit: float },diff: { value: new THREE.Color(0xfff25f), type: color, unit: vec3 },color3: { value: new THREE.Color(0xff), type: color, unit: vec3 },center: { value: new THREE.Vector3(0, 0, 0), type: position, unit: vec3 },intensity: { value: 3, type: number, unit: float },isDisCard: { value: true, type: bool, unit: bool },}material.onBeforeCompile (shader) {Object.keys(uniforms).forEach((key) shader.uniforms[key] uniforms[key])shader.vertexShader shader.vertexShader.replace(void main() {,varying vec2 vUv; varying vec3 v_position; void main() { vUv uv; v_position position;)shader.fragmentShader shader.fragmentShader.replace(/#include /,Object.keys(uniforms).map(i uniform uniforms[i].unit i ;).join(\n) \n varying vec3 v_position; varying vec2 vUv;\n\n#include \n)shader.fragmentShader shader.fragmentShader.replace(vec4 diffuseColor vec4( diffuse, opacity );,float dis length(v_position - center); vec4 diffuseColor; if(dis (innerCircleWidth circleWidth) dis innerCircleWidth) { float r (dis - innerCircleWidth) / circleWidth; float cOpacity reverseOpacity ? (innerCircleWidth / circleMax) : 1. - ( innerCircleWidth / circleMax ); #ifdef USE_MAP vec3 textureColor texture2D(map, vUv).rgb; if(isDisCard textureColor.r 0.1 textureColor.g 0.1 textureColor.b 0.1 ) discard; #endif diffuseColor vec4( mix(diff, color3, r)vec3(intensity, intensity, intensity) , opacitycOpacity * opacityScale); } else { if(isDisCard) discard ; else diffuseColor vec4( diffuse, opacity ); })}material.needsUpdate truemesh.rotation.x Math.PI / 2scene.add(mesh)animate()function animate() {uniforms.innerCircleWidth.value uniforms.circleMax.value ? uniforms.innerCircleWidth.value uniforms.circleSpeed.value : uniforms.innerCircleWidth.value 0requestAnimationFrame(animate)controls.update()renderer.render(scene, camera)}window.onresize () {renderer.setSize(box.clientWidth, box.clientHeight)camera.aspect box.clientWidth / box.clientHeightcamera.updateProjectionMatrix()}完整源码GitHub小结本文提供平面扫描完整 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
Three.js 平面扫描教程
平面扫描 ·Plane Scan· ▶ 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requestAnimationFrame渲染循环与resize自适应效果说明本案例演示平面扫描效果基于 WebGL 实现「平面扫描」可视化效果附完整可运行源码核心用到 onBeforeCompile、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。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()。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(50, box.clientWidth / box.clientHeight, 0.1, 1000)camera.position.set(0, 2, 2)const renderer new THREE.WebGLRenderer({ antialias: true, alpha: true, logarithmicDepthBuffer: true })renderer.outputColorSpace THREE.LinearSRGBColorSpacerenderer.setSize(box.clientWidth, box.clientHeight)box.appendChild(renderer.domElement)const controls new OrbitControls(camera, renderer.domElement)controls.enableDamping trueconst plane new THREE.PlaneGeometry(5,5)const map new THREE.TextureLoader().load(https://z2586300277.github.io/three-editor/dist/files/channels/texture.jpg)const material new THREE.MeshBasicMaterial({ color: 0xffffff, side: THREE.DoubleSide, map , transparent: true })const mesh new THREE.Mesh(plane, material)const uniforms {innerCircleWidth: { value: 0.59, type: number, unit: float },circleWidth: { value: 0.2, type: number, unit: float },circleMax: { value: 0.7, type: number, unit: float },opacityScale: { value: 0.8, type: number, unit: float },reverseOpacity: { value: false, type: bool, unit: bool },circleSpeed: { value: 0.003, type: number, unit: float },diff: { value: new THREE.Color(0xfff25f), type: color, unit: vec3 },color3: { value: new THREE.Color(0xff), type: color, unit: vec3 },center: { value: new THREE.Vector3(0, 0, 0), type: position, unit: vec3 },intensity: { value: 3, type: number, unit: float },isDisCard: { value: true, type: bool, unit: bool },}material.onBeforeCompile (shader) {Object.keys(uniforms).forEach((key) shader.uniforms[key] uniforms[key])shader.vertexShader shader.vertexShader.replace(void main() {,varying vec2 vUv; varying vec3 v_position; void main() { vUv uv; v_position position;)shader.fragmentShader shader.fragmentShader.replace(/#include /,Object.keys(uniforms).map(i uniform uniforms[i].unit i ;).join(\n) \n varying vec3 v_position; varying vec2 vUv;\n\n#include \n)shader.fragmentShader shader.fragmentShader.replace(vec4 diffuseColor vec4( diffuse, opacity );,float dis length(v_position - center); vec4 diffuseColor; if(dis (innerCircleWidth circleWidth) dis innerCircleWidth) { float r (dis - innerCircleWidth) / circleWidth; float cOpacity reverseOpacity ? (innerCircleWidth / circleMax) : 1. - ( innerCircleWidth / circleMax ); #ifdef USE_MAP vec3 textureColor texture2D(map, vUv).rgb; if(isDisCard textureColor.r 0.1 textureColor.g 0.1 textureColor.b 0.1 ) discard; #endif diffuseColor vec4( mix(diff, color3, r)vec3(intensity, intensity, intensity) , opacitycOpacity * opacityScale); } else { if(isDisCard) discard ; else diffuseColor vec4( diffuse, opacity ); })}material.needsUpdate truemesh.rotation.x Math.PI / 2scene.add(mesh)animate()function animate() {uniforms.innerCircleWidth.value uniforms.circleMax.value ? uniforms.innerCircleWidth.value uniforms.circleSpeed.value : uniforms.innerCircleWidth.value 0requestAnimationFrame(animate)controls.update()renderer.render(scene, camera)}window.onresize () {renderer.setSize(box.clientWidth, box.clientHeight)camera.aspect box.clientWidth / box.clientHeightcamera.updateProjectionMatrix()}完整源码GitHub小结本文提供平面扫描完整 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
