public void OnPreCull()

In the Built-in Render Pipeline, Unity calls on MonoBehaviours that are attached to the same GameObject as an enabled Camera component, just before that Camera performs the culling operation that determines what it can see. Use to execute your own code at this point in the render loop; for example, you can change the Camera's settings before performing the culling operation, to affect what the Camera sees. can be a coroutine. For similar functionality that does not require the script to be on the same GameObject as a Camera component, refer to Camera.onPreCull. Note: depends on the Built-in Render Pipeline and won't be called in projects using the Scriptable or Universal Render Pieplines. For similar functionality in the Scriptable Render Pipeline, refer to RenderPipelineManager.

// Attach this to the same GameObject as a Camera component.// This script inverts the view of the Camera, so that everything rendered by it is flippedusing UnityEngine;using System.Collections;public class ExampleClass : MonoBehaviour{    Camera cam;    void Start()    {        cam = GetComponent<Camera>();    }    void OnPreCull()    {        cam.ResetWorldToCameraMatrix();        cam.ResetProjectionMatrix();        cam.projectionMatrix = cam.projectionMatrix * Matrix4x4.Scale(new Vector3(1, -1, 1));    }    void OnPreRender()    {        GL.invertCulling = true;    }    void OnPostRender()    {        GL.invertCulling = false;    }}