【Unity】绘制阿基米德螺旋线

public class AchimedeanSpiral : MonoBehaviour{    //极坐标方程为: r = a + bθ    //平面笛卡尔坐标方程式为: x = (a + bθ)cos(θ), y = (a + bθ)sin(θ)    //a: 当θ=0°时的极径(mm)    //b: 阿基米德螺旋线系数(mm/°),表示每旋转1度时极径的增加/减小量    //θ: 极角,单位为度,表示阿基米德螺旋线转过的总度数（弧度）    //改变参数a将改变螺线形状,b控制螺线间距离,通常其为常量
    //公式参数    [SerializeField] float parameA = 1;    [SerializeField] float parameB = 1;    [SerializeField] float parameAngle = 2 * Mathf.PI;
    //Z值变化    [SerializeField] float spiralHeightAdded = 0.5f;
    //取点间隔角度（弧度）    [SerializeField] float intervalAngle = 0.1f;
    //保存取样点    List<Vector3> spiralPointList = new List<Vector3>();
    //绘制曲线    [SerializeField] LineRenderer lineRenderer;
    void Update()    {        if (Input.GetMouseButtonDown(1))            DrawSpiral();    }
    void DrawSpiral()    {        spiralPointList.Clear();
        //隔固定角度取样        float drawAngle = 0;        while (drawAngle <= parameAngle)        {            spiralPointList.Add(GetPointByAngle(drawAngle));            drawAngle += intervalAngle;        }
        lineRenderer.positionCount = spiralPointList.Count;        lineRenderer.SetPositions(spiralPointList.ToArray());    }
    float tempX, tempY, tempZ;    Vector3 GetPointByAngle(float angle)    {        //公式计算坐标        tempX = (parameA + parameB * angle) * Mathf.Cos(angle);        tempY = (parameA + parameB * angle) * Mathf.Sin(angle);        //Z值增量        tempZ = spiralHeightAdded * angle;        return new Vector3(tempX, tempY, tempZ);    }
}