Unity高自由度轨道旋转

来源：互联网发布：网络连环夺宝编辑：程序博客网时间：2024/04/30 13:40

一个物体围绕另一个物体旋转，仿天体公转的效果，可以动态的自由调节公转轨道及公转半径。

动态效果图：

可调节参数：

RevolutionTarget：围绕旋转的目标

RevolutionSelf：围绕旋转的物体

XDeviation：轨道进行X轴偏移

YDeviation：轨道进行Y轴偏移

ZDeviation：轨道进行Z轴偏移

XRotateSpeed：X轴旋转半径（为负时反向转动）

YRotateSpeed：Y轴旋转半径

ZRotateSpeed：Z轴旋转半径

RevolutionSpeed：转动速度

ShowGizmos：是否在scene显示当前轨道

圆形轨道：（三个轴轨道半径相同时为圆形轨道）

椭圆轨道：（三个轴轨道半径不同时为椭圆轨道）

轨道偏移：（仿地球公转效果）

核心代码，主要就是三角函数计算，逻辑很简单：

        _Angle += RevolutionSpeed * Time.deltaTime;        if (_Angle > 360) _Angle -= 360;        float x = RevolutionTarget.position.x + XDeviation + Mathf.Cos(_Angle * (Mathf.PI / 180)) * _radius * XRotateSpeed;        float y = RevolutionTarget.position.y + YDeviation + Mathf.Sin(_Angle * (Mathf.PI / 180)) * _radius * YRotateSpeed;        float z = RevolutionTarget.position.z + ZDeviation + Mathf.Sin(_Angle * (Mathf.PI / 180)) * _radius * ZRotateSpeed;        RevolutionSelf.position = new Vector3(x, y, z);

编辑器中的轨道绘制：

    private void OnDrawGizmos()    {        if (!ShowGizmos || RevolutionTarget == null || RevolutionSelf == null)            return;                //绘制目标线        Gizmos.color = Color.red;        Gizmos.DrawLine(RevolutionTarget.position, RevolutionSelf.position);        //绘制轨道        Gizmos.color = Color.blue;        float sub = 0.1f;        float i = 0;        //轨道起点        float x = RevolutionTarget.position.x + XDeviation + _radius * Mathf.Cos(i) * XRotateSpeed;        float y = RevolutionTarget.position.y + YDeviation + _radius * Mathf.Sin(i) * YRotateSpeed;        float z = RevolutionTarget.position.z + ZDeviation + _radius * Mathf.Sin(i) * ZRotateSpeed;        Vector3 sPoint = new Vector3(x, y, z);        Vector3 ePoint = Vector3.zero;        for (i += sub; i <= Mathf.PI * 2; i += sub)        {            x = RevolutionTarget.position.x + XDeviation + _radius * Mathf.Cos(i) * XRotateSpeed;            y = RevolutionTarget.position.y + YDeviation + _radius * Mathf.Sin(i) * YRotateSpeed;            z = RevolutionTarget.position.z + ZDeviation + _radius * Mathf.Sin(i) * ZRotateSpeed;            ePoint = new Vector3(x, y, z);            Gizmos.DrawLine(sPoint, ePoint);            sPoint = ePoint;        }        //轨道终点        x = RevolutionTarget.position.x + XDeviation + _radius * Mathf.Cos(Mathf.PI * 2) * XRotateSpeed;        y = RevolutionTarget.position.y + YDeviation + _radius * Mathf.Sin(Mathf.PI * 2) * YRotateSpeed;        z = RevolutionTarget.position.z + ZDeviation + _radius * Mathf.Sin(Mathf.PI * 2) * ZRotateSpeed;        ePoint = new Vector3(x, y, z);        Gizmos.DrawLine(sPoint, ePoint);    }

github源码链接：https://github.com/SaiTingHu/Revolution

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