three.js用粒子使用canvas生成中文字符材质
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<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Three.js Canvas 文字粒子</title><style>body { margin: 0; }canvas { display: block; }</style>
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<body><script type="importmap">{"imports": {"three": "https://cdn.jsdelivr.net/npm/three@0.170.0/build/three.module.js","three/addons/": "https://cdn.jsdelivr.net/npm/three@0.170.0/examples/jsm/","three/addons/geometries/TextGeometry.js": "https://cdn.jsdelivr.net/npm/three@0.170.0/examples/jsm/geometries/TextGeometry.js","three/addons/loaders/FontLoader.js": "https://cdn.jsdelivr.net/npm/three@0.170.0/examples/jsm/loaders/FontLoader.js"}}</script><script type="module">import * as THREE from 'three';//--------------------------------------//需要显示的文字let textDisplayed = "新年好";// 创建场景、相机和渲染器const scene = new THREE.Scene();const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);const renderer = new THREE.WebGLRenderer();renderer.setSize(window.innerWidth, window.innerHeight);document.body.appendChild(renderer.domElement);// 设置相机位置camera.position.z = 50;// 创建 Canvas 纹理function createCanvasTexture(text) {const canvas = document.createElement('canvas');const context = canvas.getContext('2d');const size = 300; // Canvas 大小canvas.width = size;canvas.height = size;// 绘制背景context.fillStyle = 'rgba(0, 0, 0, 0)'; // 透明背景context.fillRect(0, 0, size, size);// 绘制文字context.font = '100px Arial';context.fillStyle = 'gold';context.textAlign = 'center';context.textBaseline = 'middle';context.fillText(text, size / 2, size / 2);// 将 Canvas 转换为纹理return new THREE.CanvasTexture(canvas);}// 创建粒子系统const particles = [];const particleCount = 100;const geometry = new THREE.BufferGeometry();const positions = [];for (let i = 0; i < particleCount; i++) {// 随机位置positions.push((Math.random() - 0.5) * 100, (Math.random() - 0.5) * 100, (Math.random() - 0.5) * 100);}geometry.setAttribute('position', new THREE.Float32BufferAttribute(positions, 3));// 创建粒子材质const texture = createCanvasTexture(textDisplayed);const material = new THREE.PointsMaterial({size: 10,map: texture, transparent: true,alphaTest: 0.5});const particleSystem = new THREE.Points(geometry, material);scene.add(particleSystem);// 动画循环let angle = 0;const radius = 80; // 相机绕场景中心旋转的半径renderer.setClearColor(0xff0000, 0.5); function animate() {requestAnimationFrame(animate);angle += 0.01;camera.position.x = radius * Math.cos(angle);camera.position.z = radius * Math.sin(angle);camera.lookAt(scene.position);renderer.render(scene, camera);}animate();</script>
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