Unity3D图像后处理特效——Global Fog

The
Global Fog image effect creates camera-based exponential fog. All calculations are done in world space which makes it possible to have height-based fog modes that can be used for sophisticated effects (see example).

全局雾图像效果可以创建基于相机的渐变雾。所有的计算均在世界空间内完成，从而有可能创建出更加复杂的基于高度雾模式的效果。



Example of global fog, demonstrating both distance and height based fog

基于距离与高度的全局雾效例子



Example of "cheating" at atmospheric effects using global fog

使用全局雾效的大气效果

As with the otherimage effects,
this effect is only available in Unity Pro and you must have the Pro Standard Assets
installed before it becomes available.

和其他图像特效一样，该特效只能在Unity Pro上进行使用，并且在使用之前必须安装Pro
Standard Assets。

Properties
属性

Fog Mode 雾模式	The available types of fog, based on distance, height or both 雾的类型，基于距离、高度或两者皆有
Start Distance 开始距离	The distance at which the fog starts fading in, in world space units 雾效开始退化的距离，单位是世界空间单位.
Global Density 全局密度	The degree to which the Fog Color accumulates with distance 雾颜色的程度，用来模拟远近的感觉.
Height Scale 高度尺度	The degree to which the fog density reduces with height (when height-based fog is enabled) 雾浓度随高度减少的程度（当使用基于高度的雾效时开启）.
Height 高度	The world space Y coordinate where fog starts to fade in 雾效开始退化的世界空间高度.
Global Fog Color 全局雾颜色	The color of the fog 雾的颜色.

Hardware support 硬件支持

This effect requires a graphics card with pixel shaders (2.0) or OpenGL ES 2.0. Additionally, depth texture support is required. PC: NVIDIA cards since 2004 (GeForce 6), AMD cards since 2004
(Radeon 9500), Intel cards since 2006 (GMA X3000); Mobile: OpenGL ES 2.0 with depth texture support; Consoles: Xbox 360, PS3.

这个特效需要显卡拥有像素着色器（2.0）或者OpenGL ES 2.0。台式机：2003年以后的NVIDIA显卡（GeForce
6），2004年以后的AMD显卡（Radeon 9500），2005年以后的Intel卡（GMA
X3000）；移动设备：OpenGL ES 2.0；控制台： Xbox 360、 PS3。

All image effects automatically disable themselves when they can not run on end-users graphics card.

所有图像特效如果无法在用户显卡上运行时将会自动被关闭。