three.js实现扩散光圈效果

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three.js实现扩散光圈效果

图例

步骤

1. 创建一个平面，添加纹理贴图
2. 缩放

代码

<template><div class="app"><div ref="canvesRef" class="canvas-wrap"></div></div>
</template><script setup>
import { ref, onMounted } from "vue";
import * as THREE from "three";
import { OrbitControls } from "three/addons/controls/OrbitControls.js";const canvesRef = ref(null);
const canvasWidth = window.innerWidth;
const canvasHeight = window.innerHeight;
let scene;
let camera;
let renderer;
let axesHelper;
let cameraControls;
let mesh;
// 光圈大小在1~2.5倍之间变化
let _s = 2.5;
init();
render();
function init() {// 场景scene = new THREE.Scene();// 相机camera = new THREE.PerspectiveCamera(45,canvasWidth / canvasHeight,1,10000);camera.position.set(600, 600, 600);camera.lookAt(0, 0, 0);// 模型addModel();// 坐标辅助对象axesHelper = new THREE.AxesHelper(200);scene.add(axesHelper);// 渲染器//antialias - 是否执行抗锯齿。默认为false.renderer = new THREE.WebGLRenderer();renderer.setSize(canvasWidth, canvasHeight);// 相机轨道控制器cameraControls = new OrbitControls(camera, renderer.domElement);
}function addModel() {const g = new THREE.PlaneGeometry(100, 100);const texture = new THREE.TextureLoader().load("../src/assets/img/扩散光圈.png");const m = new THREE.MeshBasicMaterial({color: 0x00ffff,map: texture,transparent: true,side: THREE.DoubleSide,});mesh = new THREE.Mesh(g, m);mesh.rotateX(-Math.PI / 2);scene.add(mesh);
}function render() {_s += 0.01;mesh.scale.set(_s, _s, _s);if (_s <= 1.3) {mesh.material.opacity = (_s - 1.0) * 3.3; //3.3约等于1/(1.3-1.0)，保证透明度在0~1之间变化} else if (_s > 1.3 && _s <= 2.5) {mesh.material.opacity = 1 - (_s - 1) / 1.5; //缩放2.5对应0 缩放1.0对应1} else {_s = 1.0;}renderer.render(scene, camera);requestAnimationFrame(render);
}
onMounted(() => {canvesRef.value.appendChild(renderer.domElement);
});
</script><style lang="scss" scoped>
.app {position: relative;
}
</style>

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