前言：

        three.js基本使用没问下，下面进入自定义图形

效果展示

 实现

使用BufferGeometry()自定义

<script setup lang="ts">
import { ref, onMounted } from 'vue'
import * as THREE from 'three'
// 导入轨道控制器
import { OrbitControls } from 'three/addons/controls/OrbitControls.js'

const container = ref<HTMLDivElement>()

// 创建场景
const scene = new THREE.Scene()

// 创建相机对象
const camera = new THREE.PerspectiveCamera(
	75,
	window.innerWidth / window.innerHeight,
	0.1,
	1000
)
// 设置相机位置
camera.position.set(0, 0, 10)
scene.add(camera)

// 添加物体
// 创建几何体
for (let i = 0; i < 100; i++) {
	const geometry = new THREE.BufferGeometry()
	const positionArray = new Float32Array(9)
	for (let j = 0; j < 9; j++) {
		positionArray[j] = Math.random() * 10 - 5
	}
	geometry.setAttribute('position', new THREE.BufferAttribute(positionArray, 3))
	const color = new THREE.Color(Math.random(), Math.random(), Math.random())
	const material = new THREE.MeshBasicMaterial({
		color,
		transparent: true,
		opacity: 0.5 // 透明度
	})
	// 根据几何体和材质创建物体
	const cube = new THREE.Mesh(geometry, material)
	// 将几何体添加到场景中
	scene.add(cube)
}

// 初始化渲染器
const renderer = new THREE.WebGLRenderer()
renderer.setClearColor(new THREE.Color(0xeeeeee))
// 设置three.js渲染区域的尺寸(像素px)
renderer.setSize(window.innerWidth, window.innerHeight)

// 创建控制器
const controls = new OrbitControls(camera, renderer.domElement)
// 设置阻尼，使得动画更逼真，调用update（）
controls.enableDamping = true

// 坐标轴
const axesHelper = new THREE.AxesHelper(10)
scene.add(axesHelper)
// 设置时钟
// const clock = new THREE.Clock()

// 监听事件，双击暂停
window.addEventListener('dblclick', () => {
	// 全屏
	if (document.fullscreenElement === null) {
		renderer.domElement.requestFullscreen()
	} else {
		document.exitFullscreen()
	}
})
const render = () => {
	controls.update()
	renderer.render(scene, camera) // 执行渲染操作
	requestAnimationFrame(render)
}
// 监听页面变化
window.addEventListener('resize', () => {
	// 更新摄像头
	camera.aspect = window.innerWidth / window.innerHeight
	// 更新摄像机的投影矩阵
	camera.updateProjectionMatrix()
	// 更新渲染器
	renderer.setSize(window.innerWidth, window.innerHeight)
	// 设置渲染器的像素比
	renderer.setPixelRatio(window.devicePixelRatio)
})
onMounted(() => {
	container.value?.appendChild(renderer.domElement)
	render()
})
</script>

<template>
	<div ref="container" class="container"></div>
</template>
<style scoped lang="scss">
.container {
	height: 100%;
	width: 100%;
}
</style>