Question

Description 描述

OnPreCull is called before a camera culls the scene.

在相机消隐场景之前被调用。

Culling determines which objects are visible to the camera. OnPreCull is called just before this process.

消隐决定哪个物体对于相机来说是可见的.OnPreCull仅是在这个过程被调用。

This function is called only if the script is attached to the camera and is enabled.

只有脚本被附加到相机上时才会调用这个函数。

If you want to change camera's viewing parameters (e.g. 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.

如果你想改变相机的参数(比如:fieldOfView或者transform)，可以在这里做这些。场景物体的可见性将根据相机的参数在OnPreCull之后确定。

JavaScript:

// Attach this to a camera.
// Inverts the vie of the camera so everything rendered by it, is flipped
// This will only work on  Unity - PRO
 
function OnPreCull () {
	camera.ResetWorldToCameraMatrix ();
	camera.ResetProjectionMatrix ();
	camera.projectionMatrix = camera.projectionMatrix * Matrix4x4.Scale(Vector3 (1, -1, 1));
}
// Set it to true so we can watch the flipped Objects
function OnPreRender () {
	GL.SetRevertBackfacing (true);
}
 
// Set it to false again because we don't want to affect all other cameras.
function OnPostRender () {
	GL.SetRevertBackfacing (false);
}

C#:

using UnityEngine;
using System.Collections;
 
public class ExampleClass : MonoBehaviour {
    void OnPreCull() {
        camera.ResetWorldToCameraMatrix();
        camera.ResetProjectionMatrix();
        camera.projectionMatrix = camera.projectionMatrix * Matrix4x4.Scale(new Vector3(1, -1, 1));
    }
    void OnPreRender() {
        GL.SetRevertBackfacing(true);
    }
    void OnPostRender() {
        GL.SetRevertBackfacing(false);
    }
}