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+---
+title: Three.js初见(2)
+date: 2022-04-10 22:02:34
+tags: 
+  - 前端
+  - Three.js
+categories: 
+  - 前端杂烩
+---
+
+## 自定义几何体
+
+Three.js当中的几何体都是由若干个三角形构成的
+哪怕是球形、圆柱形这些立体图形，也不存在真正的曲面，只不过这些三角形越是细小，拼凑起来越接近曲面的效果
+
+<!-- more -->
+
+![网格-球形](/images/前端杂烩/three.js/网格-球形.png)
+
+基于这种方式，我们可以构造自定义的图形
+需要使用类型化数组`TypedArray`
+
+```javascript
+const geometry = new THREE.BufferGeometry(); //创建一个Buffer类型几何体对象
+// 类型数组创建顶点数据
+const vertices = new Uint8Array([
+  0, 0, 0, // 顶点1坐标
+  10, 0, 0, // 顶点2坐标
+  0, 20, 0, // 顶点3坐标
+  0, 0, 10, // 顶点4坐标
+  0, 0, 1, // 顶点5坐标
+  20, 0, 1, // 顶点6坐标
+])
+// 创建属性缓冲区对象
+const attribue = new THREE.BufferAttribute(vertices, 3) // 3个为一组，表示一个顶点的xyz坐标
+// 设置几何体的位置属性
+geometry.setAttribute('position', attribue)
+// 三角面(网格)渲染模式
+const material = new THREE.MeshBasicMaterial({
+  color: 0x0000ff, // 三角面颜色
+  side: THREE.DoubleSide // 两面可见
+})
+const mesh = new THREE.Mesh(geometry, material)
+scene.add(mesh)
+```
+![自定义图形](/images/前端杂烩/three.js/自定义图形.png)
+
+上面的代码中使用的是`Uint8Array`, 实际上可以使用任何一种类型数组
+
+### 点材质和线材质
+上面的例子当中使用的是**网格材质**
+threejs还提供了**点材质**和**线材质**
+```javascript
+// 点材质
+const material = new THREE.PointsMaterial({
+  color: 0x0000ff,
+  size: 2
+})
+const points = new THREE.Points(geometry, material)
+scene.add(points)
+```
+![点材质](/images/前端杂烩/three.js/点材质.png)
+
+```javascript
+// 线材质
+const material=new THREE.LineBasicMaterial({
+  color: 0x0000ff // 线条颜色
+})
+const line = new THREE.Line(geometry, material) // 线条模型对象
+scene.add(line) // 线条对象添加到场景中
+```
+![线材质](/images/前端杂烩/three.js/线材质.png)
+