Inverting our mirror camera horizontally

Let's fix that mirror effect. We need to flip the image rendered by Camera 2 - mirror for the x axis (horizontally). We can do that by writing a C# script class that multiplies the camera's project matrix by a Vector3 of (-1, 1, 1). Note that the first -1 means the x values are flipped horizontally:

Figure 11.16 – Our mirror effect working after a horizontal flip

Write the following in a new C# script class, called  FlipCamera.cs. Then, add an instance as a component to Camera 2 - mirror:

using UnityEngine;

public class FlipCamera : MonoBehaviour
{
    private Camera _camera;

    void Awake() {
        _camera = GetComponent<Camera>();
    }
    
    void OnPreCull () {
        _camera.ResetWorldToCameraMatrix ();
        _camera.ResetProjectionMatrix ();
        _camera.projectionMatrix = _camera.projectionMatrix * Matrix4x4.Scale(new 
            Vector3 (-1, 1, 1));
    }
     
    void OnPreRender () {
        GL.invertCulling...