圆锥网格 · Cone Mesh · ▶ 在线运行案例

圆锥网格

你将学到什么

  • EffectComposer 多 Pass 后期处理管线
  • UnrealBloomPass 辉光 Bloom 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 圆锥网格 效果：原场景渲染后经 EffectComposer 叠加 Bloom/模糊等全屏后期；核心用到 EffectComposer、UnrealBloomPass、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。
  • EffectComposer 以多 Pass 链式渲染：RenderPass → 特效 Pass → 输出屏幕，替代直接 renderer.render。
  • OrbitControls 提供轨道旋转/缩放；开启 enableDamping 后需在 animate 中 controls.update()。

实现步骤

  1. 搭建 Scene、PerspectiveCamera、WebGLRenderer，挂载 canvas 并处理 resize
  2. 组装 EffectComposer Pass 链，在 animate 中调用 composer.render()
  3. 创建 OrbitControls（及 Raycaster 等交互控件，若源码包含）
  4. 在 requestAnimationFrame 循环中更新状态并 render（Cesium 为 viewer.render 或自动渲染）

代码要点

import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js'
import { UnrealBloomPass } from 'three/examples/jsm/postprocessing/UnrealBloomPass.js';
import { EffectComposer } from 'three/examples/jsm/postprocessing/EffectComposer.js';
import { RenderPass } from 'three/examples/jsm/postprocessing/RenderPass.js';

const 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, 20)

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 effectComposer = new EffectComposer(renderer);
const renderPass = new RenderPass(scene, camera);
effectComposer.addPass(renderPass);
const bloomPass = new UnrealBloomPass(new THREE.Vector2(box.clientWidth, box.clientHeight), 0.8, 0.4, 0.0);
effectComposer.addPass(bloomPass);

const geometry = new THREE.ConeGeometry(3.5, 5.5, 4);
const textureLoader = new THREE.TextureLoader();
const texture = textureLoader.load("https://g2657.github.io/examples-server/smartCity/demo/image/gradual_change_y_02.png");
const material = new THREE.MeshBasicMaterial({
    map: texture
})

const cone = new THREE.Mesh(geometry, material);
cone.rotation.x = -Math.PI;
scene.add(cone);

let d = 0.03
animate()

function animate() {

    if (cone.position.y > 3 || cone.position.y < 0) d = -d
    cone.position.y += d;
    cone.rotation.y += Math.PI / 100;

    requestAnimationFrame(animate)
    effectComposer.render()

}

window.onresize = () => {

    renderer.setSize(box.clientWidth, box.clientHeight)

    camera.aspect = box.clientWidth / box.clientHeight

    camera.updateProjectionMatrix()

}

完整源码：GitHub

小结