Camera.OnPreRender 在渲染之前

# [Camera](Camera.html).OnPreRender 在渲染之前

function *OnPreRender* () : void

*Description* 描述

OnPreRender is called before a camera starts rendering the scene.、

OnPreRender 在相机开始渲染场景之前调用。

This message is sent to all scripts attached to the camera.

这个消息被发送到所有附加在相机上的脚本。

Note that if you change camera's viewing parameters (e.g. [fieldOfView](Camera.fieldOfView.html)) here, they will only take effect
the next frame. Do that in [OnPreCull](Camera.OnPreCull.html)
instead.

注意如果你在这里改变了相机的视野参数（例如 fieldOfView），它们将只影响下一帧，OnPreCull 用代替。

* [C#](#)
* [JavaScript](#)

```
using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
	private bool revertFogState = false;
	void OnPreRender() {
		revertFogState = RenderSettings.fog;
		RenderSettings.fog = enabled;
	}
	void OnPostRender() {
		RenderSettings.fog = revertFogState;
	}
}
```

```
// This script lets you enable/disable fog per camera.
//这个脚本让你在每个相机开启/禁用雾效
// by enabling or disabling the script in the title of the inspector
//在检视面板开启或禁用这个脚本
// you can turn fog on or off per camera.
//在每个相机可以开启/禁用雾效
private var revertFogState = false;

function OnPreRender () {
	revertFogState = RenderSettings.fog;
	RenderSettings.fog = enabled;
}

function OnPostRender () {
	RenderSettings.fog = revertFogState;
}
```