镜头跟踪、将世界坐标转换为以摄影机为原点的坐标

//摄影机追踪多个物体
public class CameraCtr : MonoBehaviour
{
    //[SerializeReference]
    public  Transform  []GameObjects;
    private Vector3 offSet;
    private Camera upCamera;
    private void Start()
    {
        Vector3 centerPoint = CenterPoint();
        offSet = transform.position - centerPoint;
    }
    //获取所有物体的中心点                
    private Vector3 CenterPoint()
    {
        Vector3 point = new Vector3 ();
        foreach (Transform GameObject in GameObjects)
        {
            point += GameObject.position;
        }
        point = point / GameObjects.Length;
        return point;
    }
    //摄像机控制
    private void LateUpdate()
    {
        Vector3 point = CenterPoint();
        transform.position = point + offSet;
        upCamera.orthographicSize = GetScreenSize();
    }
    //获取屏幕的最大尺寸
    private float GetScreenSize()
    {
        Vector3 centerPoint = CenterPoint();
        Vector3 centerPointAtCamera = transform.InverseTransformPoint(centerPoint);        //将以世界坐标转换为以Camera为原点的坐标
        float maxSize = 0;
        foreach (Transform GameObject in GameObjects)
        {
            Vector3 gameObjectAtCamera = transform.InverseTransformPoint(GameObject.position );//将以世界坐标转换为以Camera为原点的坐标
            Vector3 distance = gameObjectAtCamera - centerPointAtCamera;//获取摄影机原点下的坦克与中心点的距离
            maxSize = Mathf.Max(maxSize ,Mathf .Abs (distance .y ));//获取y方向的最大值
            maxSize = Mathf.Max(maxSize, Mathf.Abs(distance.x))/upCamera .aspect ;//获取x方向的最大值
        }
        return maxSize;
    }
}