vue项目three.js.Line顶点显示不同颜色

在Vue项目中使用`THREE.Line`来显示不同颜色的顶点，可以按照以下步骤进行：

1. 安装`three`库：在项目的根目录下运行以下命令安装`three`库。

   npm install three

2. 在Vue组件中引入`three`库：在需要使用`THREE.Line`的Vue组件中引入`three`库。

   import * as THREE from 'three';

3. 定义顶点坐标和颜色数组：定义包含顶点坐标和颜色的数组，例如：

   const positions = [
     0, 0, 0,
     1, 1, 1,
     2, 2, 2
   ];
   
   const colors = [
     1, 0, 0,
     0, 1, 0,
     0, 0, 1
   ];

4. 创建几何体和材质：使用`THREE.BufferGeometry`创建几何体，并将顶点坐标和颜色数组传递给几何体的`position`和`color`属性。然后，使用`THREE.LineBasicMaterial`创建材质，设置`vertexColors`为`THREE.VertexColors`。

   const geometry = new THREE.BufferGeometry();
   geometry.addAttribute('position', new THREE.Float32BufferAttribute(positions, 3));
   geometry.addAttribute('color', new THREE.Float32BufferAttribute(colors, 3));
   
   const material = new THREE.LineBasicMaterial({ vertexColors: THREE.VertexColors });

5. 创建线对象并添加到场景中：使用几何体和材质创建`THREE.Line`对象，并将其添加到场景中。

   const line = new THREE.Line(geometry, material);
   scene.add(line);

完整的Vue组件示例代码如下所示：

<template>
  <div ref="container"></div>
</template>

<script>
import * as THREE from 'three';

export default {
  mounted() {
    // 创建场景、相机和渲染器
    const scene = new THREE.Scene();
    const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
    const renderer = new THREE.WebGLRenderer();
    renderer.setSize(window.innerWidth, window.innerHeight);
    this.$refs.container.appendChild(renderer.domElement);

    // 定义顶点坐标和颜色数组
    const positions = [
      0, 0, 0,
      1, 1, 1,
      2, 2, 2
    ];

    const colors = [
      1, 0, 0,
      0, 1, 0,
      0, 0, 1
    ];

    // 创建几何体和材质
    const geometry = new THREE.BufferGeometry();
    geometry.addAttribute('position', new THREE.Float32BufferAttribute(positions, 3));
    geometry.addAttribute('color', new THREE.Float32BufferAttribute(colors, 3));
  
    const material = new THREE.LineBasicMaterial({ vertexColors: THREE.VertexColors });

    // 创建线对象并添加到场景中
    const line = new THREE.Line(geometry, material);
    scene.add(line);

    // 设置相机位置
    camera.position.z = 5;

    // 渲染场景
    function animate() {
      requestAnimationFrame(animate);
      renderer.render(scene, camera);
    }
    animate();
  }
}
</script>

<style>
  #container {
    width: 100%;
    height: 100%;
    overflow: hidden;
  }
</style>