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文章目录
- 一、🍀前言
- 1.1 ☘️拉伸几何体THREE.TubeGeometry管道概念
- 二、🍀生成拉伸几何体THREE.TubeGeometry管道
- 1. ☘️实现思路
- 2. ☘️代码样例
一、🍀前言
本文详细介绍如何基于threejs在三维场景中实现生成拉伸几何体THREE.TubeGeometry管道，亲测可用。希望能帮助到您。一起学习，加油！加油！
1.1 ☘️拉伸几何体THREE.TubeGeometry管道概念
THREE.TubeGeometry 沿着一条三维的样条曲线拉伸出一根管。
创建方法：
构造函数 new THREE.TubeGeometry(new THREE.CatmullRomCurve3(points), segments, radius, radiusSegments, closed)
参数说明
path：该属性用一个 THREE.SplineCurve3 对象来指定管道应当遵循的路径。
segments：该属性指定构建这个管所用的分段数。默认值为 64.路径越长，指定的分段数应该越多。
radius：该属性指定管的半径。默认值为 1.
radiusSegments：该属性指定管道圆周的分段数。默认值为 8，分段数越多，管道看上去越圆。
closed：如果该属性设置为 true，管道的头和尾会连起来，默认值为 false。
二、🍀生成拉伸几何体THREE.TubeGeometry管道
1. ☘️实现思路
- 1、初始化renderer渲染器
- 2、初始化Scene三维场景
- 3、初始化camera相机，定义相机位置 camera.position.set
- 4、初始化THREE.AmbientLight环境光源，scene场景加入环境光源，初始化THREE.DirectionalLight平行光源，设置平行光源位置，scene添加平行光源。
- 5、加载几何模型：生成管道路径THREE.CatmullRomCurve3，并设置segments、radius、radiusSegments、closed参数生成THREE.TubeGeometry管道，创建THREE.MeshBasicMaterial基本材质，生成mesh物体，scene场景加入mesh。
- 6、加入controls、gui控制，加入stats监控器，监控帧数信息。
2. ☘️代码样例
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>learn24(拉伸几何体THREE.TubeGeometry管道)</title><script src="lib/threejs/127/three.js-master/build/three.js"></script><script src="lib/threejs/127/three.js-master/examples/js/utils/SceneUtils.js"></script><script src="lib/threejs/127/three.js-master/examples/js/geometries/ConvexGeometry.js"></script><script src="lib/threejs/127/three.js-master/examples/js/math/ConvexHull.js"></script><script src="lib/threejs/127/three.js-master/examples/js/controls/OrbitControls.js"></script><script src="lib/threejs/127/three.js-master/examples/js/libs/stats.min.js"></script><script src="lib/threejs/127/three.js-master/examples/js/libs/dat.gui.min.js"></script>
</head>
<style>body {margin: 0;}canvas {width: 100%;height: 100%;display: block;}
</style>
<body onload="draw()"></body>
<script>var renderervar initRender = () => {renderer = new THREE.WebGLRenderer({antialias: true})renderer.setSize(window.innerWidth, window.innerHeight)document.body.appendChild(renderer.domElement)}var cameravar initCamera = () => {camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 10000)camera.position.set(0, 0, 100)}var scenevar initScene = () => {scene = new THREE.Scene()}var lightvar initLight = () => {scene.add(new THREE.AmbientLight(0x404040))light = new THREE.DirectionalLight(0xffffff)light.position.set(1, 1, 1)scene.add(light)}// var initModel = () => {// var shape = new THREE.ShapeGeometry()// }var statsvar initStats = () => {stats = new Stats()document.body.appendChild(stats.dom)}var controlsvar initControls = () => {controls = new THREE.OrbitControls(camera, renderer.domElement)controls.enableDamping = true}var gui, spGroup, tubeMeshvar initGui = () => {gui = {numberOfPoints: 5,segments: 64,radius: 1,radiusSegments: 8,closed: false,points: [],newPoints: function () {//生成一些随机点放置到数组当中var points = []for (var i = 0; i < gui.numberOfPoints; i++) {var randomX = -20 + Math.round(Math.random() * 50)var randomY = -15 + Math.round(Math.random() * 40)var randomZ = -20 + Math.round(Math.random() * 40)points.push(new THREE.Vector3(randomX, randomY, randomZ))}gui.points = pointsgui.redraw()},redraw: function () {//清楚掉场景中原来的模型对象scene.remove(spGroup)scene.remove(tubeMesh)//重新绘制模型generatePoints(gui.points, gui.segments, gui.radius, gui.radiusSegments, gui.closed)}}var datGui = new dat.GUI()//将设置属性添加到gui当中，gui.add(对象，属性，最小值，最大值）datGui.add(gui, 'newPoints')datGui.add(gui, 'numberOfPoints', 2, 15).step(1).onChange(gui.newPoints)datGui.add(gui, 'segments', 0, 200).step(1).onChange(gui.redraw)datGui.add(gui, 'radius', 0, 10).onChange(gui.redraw)datGui.add(gui, 'radiusSegments', 0, 100).step(1).onChange(gui.redraw)datGui.add(gui, 'closed').onChange(gui.redraw)gui.newPoints()}var generatePoints = (points, segments, radius, radiusSegments, closed) => {spGroup = new THREE.Object3D()var material = new THREE.MeshBasicMaterial({color: 0xff0000, transparent: false})points.forEach(point => {var spGeom = new THREE.SphereGeometry(0.2)var spMesh = new THREE.Mesh(spGeom, material)spMesh.position.copy(point)spGroup.add(spMesh)})scene.add(spGroup)var tubeGeometry = new THREE.TubeGeometry(new THREE.CatmullRomCurve3(points), segments, radius, radiusSegments, closed)tubeMesh = createMesh(tubeGeometry)scene.add(tubeMesh)}var createMesh = (geom) => {var meshMaterial = new THREE.MeshBasicMaterial({color: 0x00ff00, transparent: true, opacity: 0.3})var wireFrameMat = new THREE.MeshBasicMaterial()wireFrameMat.wireframe = truevar mesh = THREE.SceneUtils.createMultiMaterialObject(geom, [meshMaterial, wireFrameMat])return mesh}var render = () => {renderer.render(scene, camera)}var onWindowResize = () => {camera.aspect = window.innerWidth / window.innerHeightcamera.updateProjectionMatrix()render()renderer.setSize(window.innerWidth, window.innerHeight)}var animate = () => {render()stats.update()controls.update()requestAnimationFrame(animate)}var draw = () => {initRender()initScene()initCamera()initLight()initControls()initStats()initGui()animate()window.onresize = onWindowResize}
</script>
</html>
效果如下：
