Unity高*度轨道旋转

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*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