做项目镜子屏幕需要左右翻转画面

直接挂摄像机上勾选一下即可（注意只反场景里的 不包括ui）

  using UnityEngine;
     [RequireComponent(typeof(Camera))]
     [ExecuteInEditMode]
     public class MirrorFlipCamera : MonoBehaviour {
         new Camera camera;
         public bool flipHorizontal;
         void Awake () {
             camera = GetComponent<Camera>();
         }
         void OnPreCull() {
             camera.ResetWorldToCameraMatrix();
             camera.ResetProjectionMatrix();
             Vector3 scale = new Vector3(flipHorizontal ? -1 : 1, 1, 1);
             camera.projectionMatrix = camera.projectionMatrix * Matrix4x4.Scale(scale);
         }
         void OnPreRender () {
             GL.invertCulling = flipHorizontal;
         }
         
         void OnPostRender () {
             GL.invertCulling = false;
         }
     }

Matrix4x4 mat = camera.projectionMatrix;  
mat *= Matrix4x4.Scale(new Vector3(-1, 1, 1));  
camera.projectionMatrix = mat;

会造成镜像里画面出现问题

因为没有重置矩阵，摄像机画面不一定是正对着的

主要代码摘自

http://answers.unity3d.com/questions/20337/flipmirror-camera.html