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--- a/source/_posts/前端杂烩/Three.js初见(2).md
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@@ -63,7 +63,7 @@ scene.add(points)
 
 ```javascript
 // 线材质
-const material=new THREE.LineBasicMaterial({
+const material = new THREE.LineBasicMaterial({
   color: 0x0000ff // 线条颜色
 })
 const line = new THREE.Line(geometry, material) // 线条模型对象
@@ -71,3 +71,119 @@ 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)
 
+
+### 设置每个顶点的颜色
+```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)
+
+// 点材质
+const material = new THREE.PointsMaterial({
+  // color: 0x0000ff,
+  vertexColors: THREE.VertexColors, //以顶点颜色为准
+  size: 2
+})
+const pointColors = new Uint8Array([
+  1, 0, 0, //顶点1颜色
+  0, 1, 0, //顶点2颜色
+  0, 0, 1, //顶点3颜色
+  1, 1, 0, //顶点4颜色
+  0, 1, 1, //顶点5颜色
+  1, 0, 1, //顶点6颜色
+])
+geometry.attributes.color = new THREE.BufferAttribute(pointColors, 3) // 3个为一组代表一个顶点的RGB值
+const points = new THREE.Points(geometry, material)
+scene.add(points)
+```
+![点材质颜色](/images/前端杂烩/three.js/点材质颜色.png)
+
+这个例子当中与上面的区别除了指定每个顶点的颜色之外
+还需要给材质的`vertexColors`设置为`THREE.VertexColors`
+该属性的默认值是`THREE.NoColors`, 意思就是模型的颜色取决于材质的color
+
+如果把上述的方式使用到**三角面材质**上
+可以得到渐变色的面
+![三角面-渐变色](/images/前端杂烩/three.js/三角面-渐变色.png)
+
+### 顶点坐标复用
+由于threejs当中的图形都是由若干个三角形拼接而成
+所以实际应用当中, 肯定是多个相邻三角形的顶点重合
+如果每个三角形都要分别指定3个顶点的坐标, 数据肯定是非常冗余的
+所以可以进行顶点坐标的复用
+同时也不受限于坐标定义的顺序
+
+```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 Int8Array([
+  0, 0, 0,
+  10, 0, 0,
+  10, 10, 0,
+  0, 10, 0,
+  -10, 10, 0,
+  -10, 0, 0,
+])
+// 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)
+// Uint16Array类型数组创建顶点索引数据
+const indexes = new Uint8Array([
+  // 0对应第1个顶点
+  // 索引值3个为一组，表示一个三角形的3个顶点
+  0, 1, 2,
+  0, 2, 3,
+  0, 3, 4,
+  0, 4, 5,
+])
+// 索引数据赋值给几何体的index属性
+geometry.index = new THREE.BufferAttribute(indexes, 1) //1个为一组
+```
+![顶点坐标复用](/images/前端杂烩/three.js/顶点坐标复用.png)
+
+### Vector3和Color
+
+除了使用`BufferGeometry`之外, 我们也可以使用`Vector3`和`Color`来创建自定义几何体
+它们是基于`Geometry`这个API进行使用的
+Threejs渲染的时候会先把 Geometry 转化为 BufferGeometry 再解析几何体顶点数据进行渲染
+
+**Vector3**表示三维向量, 也可以理解为点的坐标
+
+```javascript
+const geometry = new THREE.Geometry()
+// 类型数组创建顶点数据
+geometry.vertices.push(
+  new THREE.Vector3(0, 0, 0),
+  new THREE.Vector3(10, 0, 0),
+  new THREE.Vector3(0, 20, 0),
+  new THREE.Vector3(0, 0, 10),
+  new THREE.Vector3(0, 0, 1),
+  new THREE.Vector3(20, 0, 1),
+)
+geometry.colors.push(
+  new THREE.Color(0xff0000),
+  new THREE.Color(0x00ff00),
+  new THREE.Color(0x0000ff),
+  new THREE.Color(0xffff00),
+  new THREE.Color(0x00ffff),
+  new THREE.Color(0xff00ff),
+)
+// 点材质
+const material = new THREE.PointsMaterial({
+  vertexColors: THREE.VertexColors, //以顶点颜色为准
+})
+const points = new THREE.Points(geometry, material)
+scene.add(points)
+```
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