threejs 绘制曲线
时间: 2023-09-20 08:07:59 浏览: 52
Three.js 可以通过 THREE.Curve 和 THREE.Path 类来绘制曲线。
1. 首先,创建一个曲线对象。例如,创建一个二次贝塞尔曲线对象:
```javascript
var curve = new THREE.QuadraticBezierCurve3(
new THREE.Vector3(0, 0, 0), // 起点
new THREE.Vector3(50, 100, 0), // 控制点
new THREE.Vector3(100, 0, 0) // 终点
);
```
2. 使用 THREE.CurvePath 类来将多个曲线连接起来,形成一个路径:
```javascript
var path = new THREE.CurvePath();
path.add(curve);
```
3. 创建一个 THREE.TubeGeometry 对象,通过路径和细分数创建一个管道几何体:
```javascript
var tubeGeometry = new THREE.TubeGeometry(path, 20, 2, 8, false);
```
其中,参数说明如下:
- path:路径对象。
- segments:沿曲线细分数。
- radius:管道半径。
- radialSegments:管道横向细分数。
- closed:是否闭合管道。
4. 创建一个 THREE.Mesh 对象,并将管道几何体作为其参数:
```javascript
var material = new THREE.MeshBasicMaterial({ color: 0xff0000 });
var mesh = new THREE.Mesh(tubeGeometry, material);
```
5. 将 mesh 添加到场景中即可:
```javascript
scene.add(mesh);
```
完整代码示例:
```javascript
var curve = new THREE.QuadraticBezierCurve3(
new THREE.Vector3(0, 0, 0),
new THREE.Vector3(50, 100, 0),
new THREE.Vector3(100, 0, 0)
);
var path = new THREE.CurvePath();
path.add(curve);
var tubeGeometry = new THREE.TubeGeometry(path, 20, 2, 8, false);
var material = new THREE.MeshBasicMaterial({ color: 0xff0000 });
var mesh = new THREE.Mesh(tubeGeometry, material);
scene.add(mesh);
```