使用CurvePath和CubicBezierCurve3创建一条曲线

1.曲线路径（CurvePath）

一个扩展了Curve的抽象基类。CurvePath仅仅是一个已连接的曲线的数组，但保留了曲线的API。

path.getPoints ( divisions : Integer ) : divisions -- 曲线分段数量。默认值为12。

2.三维三次贝塞尔曲线（CubicBezierCurve3）

创建一条平滑的三维 三次贝塞尔曲线， 由起点、终点和两个控制点所定义。

 

 const path = new THREE.CurvePath();
    const controlPoints = [
      new THREE.Vector3(-10, 10, 5),
      new THREE.Vector3(0, 0, 0),
      new THREE.Vector3(5, 3, -5),
      new THREE.Vector3(10, 3, -5),
      new THREE.Vector3(30, 3, -5),
      new THREE.Vector3(50, 3, -5),
      new THREE.Vector3(70, 3, -5),
      new THREE.Vector3(90, 3, -5),
      new THREE.Vector3(110, 3, -5),
      new THREE.Vector3(130, 3, -5),
      new THREE.Vector3(150, 3, -5),
      new THREE.Vector3(170, 3, -5),
      new THREE.Vector3(170, 3, -10),
      new THREE.Vector3(170, 3, -20),
      new THREE.Vector3(170, 3, -30),
      new THREE.Vector3(170, 3, -40),
      new THREE.Vector3(170, 3, -50),
      new THREE.Vector3(170, 3, -60),
      new THREE.Vector3(170, 3, -70),
      new THREE.Vector3(170, 3, -80),
      new THREE.Vector3(170, 3, -90),
      new THREE.Vector3(160, 3, -90),
      new THREE.Vector3(150, 3, -90),
      new THREE.Vector3(140, 10, -90),
      new THREE.Vector3(130, 20, -90),
      new THREE.Vector3(120, 30, -90),
      new THREE.Vector3(110, 40, -90),
      new THREE.Vector3(0, 30, -90),
      new THREE.Vector3(-5, 20, -50),
      new THREE.Vector3(-10, 10, -40),
      new THREE.Vector3(-10, 10, -20),
      new THREE.Vector3(-10, 10, 0),
      new THREE.Vector3(-10, 10, 2),
      new THREE.Vector3(-10, 10, 4),
      new THREE.Vector3(-10, 10, 5),
    ];

    // 使用 `CubicBezierCurve3` 将控制点连接成平滑的曲线
    for (let i = 0; i < controlPoints.length - 3; i += 3) {
      path.add(
        new THREE.CubicBezierCurve3(
          controlPoints[i], // 起始点
          controlPoints[i + 1], // 第一个控制点
          controlPoints[i + 2], // 第二个控制点
          controlPoints[i + 3] // 结束点
        )
      );
    }

    const curvePathPoints = path.getPoints(50);
    const curvGeometry = new THREE.BufferGeometry().setFromPoints(curvePathPoints);

    const material1 = new THREE.LineBasicMaterial({ color: 0xff0000 });

    // Create the final object to add to the scene
    const curveObject = new THREE.Line(curvGeometry, material1);