曲线Curve

1.setFromPoints

.setFromPoints()是几何体BufferGeometry的一个方法，通过该方法可以把数组pointsArr中坐标数据提取出来赋值给几何体。具体说就是把pointsArr里面坐标数据提取出来，赋值给geometry.attributes.position属性

2. 2D曲线

1. 直线-LineCurve

2. 圆弧-ArcCurve

3.椭圆-EllipseCurve

4.二维样条曲线-SplineCurve

5.二维贝塞尔曲线二次QuadraticBezierCurve

6.二维贝塞尔曲线三次CubicBezierCurve

3.3D曲线

1.直线-LineCurve3

2.三维样条曲线-CatmullRomCurve3

5.三维贝塞尔曲线二次QuadraticBezierCurve3

6.三维贝塞尔曲线三次CubicBezierCurve3

4.代码

    const p1 = new THREE.Vector3(0, 0, 0);const p2 = new THREE.Vector3(5, 10, 0);const p3 = new THREE.Vector3(10, 0, 0);const curve = new THREE.QuadraticBezierCurve3(p1, p2, p3);const points = curve.getPoints(40);const geometry = new THREE.BufferGeometry();geometry.setFromPoints(points);const material = new THREE.LineBasicMaterial({color: 0xff0000,});const line = new THREE.Line(geometry, material);scene.add(line);const pointGeometry = new THREE.BufferGeometry();pointGeometry.setFromPoints([p1, p2, p3]);const pointMaterial = new THREE.PointsMaterial({color: 0x00ffff,size: 0.5});const pointsMesh = new THREE.Points(pointGeometry, pointMaterial);scene.add(pointsMesh);