MonoBehaviour.OnPreCull()

Description

OnPreCull is called before a camera culls the Scene.

剔除操作决定了摄像机能够看到哪些对象。 OnPreCull 在该过程即将开始前调用。

仅当该脚本附加到摄像机并且启用时，才调用该函数。

If you want to change camera's viewing parameters (e.g. Camera.fieldOfView or just transform), this is the place to do it. Visibility of Scene objects will be determined based on camera's parameters after OnPreCull.

// Attach this to a camera.
// Inverts the view of the camera so everything rendered by it, is flipped

using 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;
    }
}