Unity 透视摄像机视野适配不同分辨率的屏幕

正交摄像机的请看这篇文章，就懒得再写一次了：Unity UGUI使用技巧与经验总结（不定期更新）_unity ugui技巧 之 text文本框随内容自动调整-优快云博客

相关注释请看代码中的说明

using UnityEngine;

/// <summary>
/// 透视摄像机视野适配，注意单独修改视野大小容易造成透视效果不佳的情况，请慎用
/// </summary>
public class CameraAutoFix : MonoBehaviour
{
    [Tooltip("顶部需要显示的物体")]
    public Transform topPos;

    [Tooltip("底部需要显示的物体")]
    public Transform bottomPos;

    public Camera m_Camera;
    /// <summary>
    /// 因为要转换为WebGL平台，webgl平台会将结构体转换为一个class，所以这里单独声明并缓存一下，下方使用set函数进行值的修改则是为了避免修改时new一个新的Vector3对象出来
    /// </summary>
    private Vector3 topV = new Vector3();
    private Vector3 bottomV = new Vector3();

    [Space]
    [Tooltip("左侧需要显示的物体")]
    public Transform leftPos;

    [Tooltip("右侧需要显示的物体")]
    public Transform rightPos;

#if UNITY_EDITOR

    [Space]
    public bool resetSet = false;

#endif

    public void Awake()
    {
        if (m_Camera == null)
            m_Camera = GetComponent<Camera>();
        AutoFixedFovSize();
    }

#if UNITY_EDITOR

    private void Update()
    {
        if (resetSet)
        {
            AutoFixedFovSize();
            resetSet = false;
        }
    }

#endif

    // FOV： 相机的垂直视野，以度为单位
    /// <summary>
    /// 自动调整视野大小
    /// </summary>
    private void AutoFixedFovSize()
    {
        float targetValue = 0;
        // 将角度进行转换
        if (Screen.height < Screen.width) // 竖屏
        {
            topV.Set(topPos.position.x - m_Camera.transform.position.x, topPos.position.y - m_Camera.transform.position.y, topPos.position.z - m_Camera.transform.position.z);
            bottomV.Set(bottomPos.position.x - m_Camera.transform.position.x, bottomPos.position.y - m_Camera.transform.position.y, bottomPos.position.z - m_Camera.transform.position.z);

            // 因为测试下来，所得到的角度，差不多为所需角度的一半，所以这里*2翻倍一下
            targetValue = Vector3.Angle(topV, bottomV) * 2;
        }
        else
        {
            // 取摄像机看向所需显示的点的角度
            topV.Set(leftPos.position.x - m_Camera.transform.position.x, leftPos.position.y - m_Camera.transform.position.y, leftPos.position.z - m_Camera.transform.position.z);
            bottomV.Set(rightPos.position.x - m_Camera.transform.position.x, rightPos.position.y - m_Camera.transform.position.y, rightPos.position.z - m_Camera.transform.position.z);
            targetValue = Camera.VerticalToHorizontalFieldOfView(Vector3.Angle(topV, bottomV), (float)Screen.height / Screen.width);
        }
        // 原始配置可用时，则不进行更改
        if (m_Camera.fieldOfView < targetValue)
            m_Camera.fieldOfView = targetValue;
    }
}