学习threejs，利用THREE.ExtrudeGeometry拉伸几何体实现svg的拉伸

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文章目录

一、🍀前言
- 1.1 ☘️THREE.ExtrudeGeometry拉伸几何体概念
二、🍀利用THREE.ExtrudeGeometry拉伸几何体实现svg的拉伸
- 1. ☘️实现思路
- 2. ☘️代码样例

一、🍀前言

本文详细介绍如何基于threejs在三维场景中利用THREE.ExtrudeGeometry拉伸几何体实现svg的拉伸，亲测可用。希望能帮助到您。一起学习，加油！加油！

1.1 ☘️THREE.ExtrudeGeometry拉伸几何体概念

THREE.ExtrudeGeometry 是 Three.js 中用于创建挤出几何体的一个类。挤出几何体是从一个二维路径（轮廓）通过沿着某个方向（通常是 Z 轴）“挤出”一定的距离来生成三维几何体。这种方法非常适合创建各种三维模型，如字母、符号、标志等。
创建方法：
构造函数 new THREE.ExtrudeGeometry(shape, extrudeSettings) 接受两个参数来定义挤出几何体的形状和挤出设置。
参数说明
shape：一个 THREE.Shape 对象，定义了要挤出的二维轮廓。
extrudeSettings：一个包含挤出参数的对象，可选参数包括：
amount：挤出的距离，默认为 100。
bevelEnabled：是否启用倒角，默认为 true。
bevelThickness：倒角厚度，默认为 10。
bevelSize：倒角大小，默认为 8。
bevelSegments：倒角分割数量，默认为 1。
steps：挤出路径分割的数量，默认为 1。
curveSegments：曲线分割数量，默认为 12。
uvGenerator：UV 坐标生成器，默认为 THREE.ExtrudeGeometryUVGenerator。

二、🍀利用THREE.ExtrudeGeometry拉伸几何体实现svg的拉伸

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：根据svg数据生成THREE.ShapeGeometry几何体，使用THREE.MeshPhongMaterial反射材质，生成mesh物体，scene场景加入mesh。
6、加入controls、gui控制，gui控制中加入asGeom函数用于生成基于svg数据的THREE.ExtrudeGeometry拉伸几何体，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>learn26(svg拉高)</title><script src="lib/threejs/127/three.js-master/build/three.js"></script><script src="https://johnson2heng.github.io/three.js-demo/lib/js/libs/d3-threeD.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/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>
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<body onload="draw()">
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