利用vue3+threejs仿iView官网大波浪特效实例

npm install --save three

<template>  <div id="iviewBg"></div></template><script>import * as THREE from "three";显示右上角fps框// import Stats from "./stats.module";import { onMounted } from "vue";export default {  props: {  	//控制x轴波浪的长度    amountX: {      type: Number,      default: 50,    },    //控制y轴波浪的长度    amountY: {      type: Number,      default: 50,    },    //控制点颜色    color: {      type: String,      default: "#097bdb",    },    //控制波浪的位置    top: {      type: Number,      default: 350,    },  },  setup(props) {    const SEPARATION = 100;    // let stats;    let container, camera, scene, renderer;    let particles,      count = 0;    let mouseX = 0;    let windowHalfX = window.innerWidth / 2;    function init() {      container = document.createElement("div");      document.getElementById("iviewBg").appendChild(container);      //创建透视相机      camera = new THREE.PerspectiveCamera(        75, //摄像机视锥体垂直视野角度        window.innerWidth / window.innerHeight, //摄像机视锥体长宽比        1, //摄像机视锥体近端面        10000 //摄像机视锥体远端面      );      //设置相机z轴视野      camera.position.z = 1000;      //创建场景      scene = new THREE.Scene();      const numParticles = props.amountX * props.amountY;      const positions = new Float32Array(numParticles * 3);      const scales = new Float32Array(numParticles);      let i = 0,        j = 0;      // 初始化粒子位置和大小      for (let ix = 0; ix < props.amountX; ix++) {        for (let iy = 0; iy < props.amountY; iy++) {          positions[i] = ix * SEPARATION - (props.amountX * SEPARATION) / 2; // x          positions[i + 1] = 0; // y          positions[i + 2] = iy * SEPARATION - (props.amountY * SEPARATION) / 2; // z          scales[j] = 1;          i += 3;          j++;        }      }      //是面片、线或点几何体的有效表述。包括顶点位置，面片索引、法相量、颜色值、UV 坐标和自定义缓存属性值。使用 BufferGeometry 可以有效减少向 GPU 传输上述数据所需的开销      const geometry = new THREE.BufferGeometry();      geometry.setAttribute(        "position",        new THREE.BufferAttribute(positions, 3)      );      geometry.setAttribute("scale", new THREE.BufferAttribute(scales, 1));      //着色器材质(ShaderMaterial),设置球的大小，颜色，等      const material = new THREE.ShaderMaterial({        uniforms: {          //设置球的颜色          color: { value: new THREE.Color(props.color) },        },        //控制球的大小        vertexShader:          "attribute float scale; void main() {vec4 mvPosition = modelViewMatrix * vec4( position, 1.0 );gl_PointSize = scale * ( 300.0 / - mvPosition.z );gl_Position = projectionMatrix * mvPosition;}",        fragmentShader:          "uniform vec3 color;void main() {if ( length( gl_PointCoord - vec2( 0.5, 0.5 ) ) > 0.475 ) discard;gl_FragColor = vec4( color, 1.0 );}",      });      //一个用于显示点的类。      particles = new THREE.Points(geometry, material);      //往场景中添加点      scene.add(particles);      //alpha - canvas是否包含alpha (透明度)。默认为 false。      //渲染器的背景色默认为黑色，设置渲染器的背景色为透明      renderer = new THREE.WebGLRenderer({ antialias: true, alpha: true });      renderer.setPixelRatio(window.devicePixelRatio);      renderer.setClearAlpha(0);      renderer.setSize(window.innerWidth, window.innerHeight);      container.appendChild(renderer.domElement);      //显示右上角fps框      // stats = new Stats();      //   container.appendChild(stats.dom);      container.style.touchAction = "none";      //监听鼠标移动事件      container.addEventListener("pointermove", onPointerMove);      //调整波浪的位置      container.style.position = "relative";      container.style.top = `${props.top}px`;      window.addEventListener("resize", onWindowResize);    }    function render() {      camera.position.x += (mouseX - camera.position.x) * 0.05;      camera.position.y = 400;      camera.lookAt(scene.position);      const positions = particles.geometry.attributes.position.array;      const scales = particles.geometry.attributes.scale.array;      // 设置粒子位置和大小      let i = 0,        j = 0;      for (let ix = 0; ix < props.amountX; ix++) {        for (let iy = 0; iy < props.amountY; iy++) {          positions[i + 1] =            Math.sin((ix + count) * 0.3) * 50 +            Math.sin((iy + count) * 0.5) * 50;          scales[j] =            (Math.sin((ix + count) * 0.3) + 1) * 10 +            (Math.sin((iy + count) * 0.5) + 1) * 10;          i += 3;          j++;        }      }      particles.geometry.attributes.position.needsUpdate = true;      particles.geometry.attributes.scale.needsUpdate = true;      renderer.render(scene, camera);      count += 0.1;    }    function onWindowResize() {      windowHalfX = window.innerWidth / 2;      camera.aspect = window.innerWidth / window.innerHeight;      camera.updateProjectionMatrix();      renderer.setSize(window.innerWidth, window.innerHeight);    }    //监听鼠标移动事件    function onPointerMove(event) {      console.log(event);      if (event.isPrimary === false) return;      mouseX = event.clientX - windowHalfX;    }    function animate() {      requestAnimationFrame(animate);      render();      //fps 实时更新      // stats.update();    }    onMounted(() => {      init();      animate();    });    return {};  },};</script><style lang="scss" scoped>#iviewBg {  width: 100%;  height: 100vh;  background: url("../assets/wavesBg.png") no-repeat;  overflow: hidden;}</style>

<template>  <wavesBg :top="250"></wavesBg>    <div class="login-container">  </div></template><script>import wavesBg from "../components/wavesBg";export default {  name: "",  components: {    wavesBg,  },  setup() {        return {         };  },};</script>