Editing .shader

'''.shader files''' define '''shaders''', which are an important part of the [[Id Tech 3]] graphics system. Shaders are text scripts which can be edited with a text editor. The JK2 SDK also comes with a GUI shader editor called [[ShaderEd]].

In [[JO]] and [[JA]], .shader files are located in the ''shaders'' subdirectory.

Basically speaking, a shader can be thought of as a dynamic [[texture]]. Using shaders, the following kinds of textures can be created:
* animated textures
* lit and glowing textures
* moving/scrolling textures
* sky textures
* transparent or semi-transparent textures (eg. grates, glass, force fields)
* grass

Shaders do not only affect the visual appearance of surfaces, but can also change the behaviour of surfaces. So for example, shaders are used to create liquids, and surfaces made out of different kinds of materials (eg. metal, sand, snow).

== System shaders ==
System shaders are special shaders which affect game rendering and gameplay. Some of these are described below. Further information about system shaders can be found [https://icculus.org/gtkradiant/documentation/q3radiant_manual/ch07/pg7_1.htm#interactex here].

'''textures/system/clip''' - creates an invisible clipping surface (blocks player and NPC movement)

'''textures/system/physics_clip''' - creates an invisible clipping surface that also stops weapons and projectiles. Commonly used to give solidness to models.

'''textures/system/do_not_enter''' - blocks [[NPC]] movement, but not players. Used to stop enemies and other AI entering certain areas of the map

'''textures/system/cushion''' - if players fall on to this surface, they will not take fall damage

'''textures/system/origin''' - used to set the origin of func_rotating, func_train and func_static entities

'''textures/system/trigger''' - used to create [[Entity#trigger entities|trigger]] entitites

'''textures/system/caulk''' - a non-drawn surface, but behaves as if it is solid (eg. blocks VIS and light) and "seals" off the map from the void

'''textures/system/weatherzone''' - for creating a weatherzone entity, see [[Weather]]

'''textures/system/outside''' - designates an outside area for weather

'''textures/system/inside''' - designates an inside area (no weather)

== See also ==
* [https://icculus.org/gtkradiant/documentation/Q3AShader_Manual/ Quake 3 Shader Manual]

[[Category: File Types]]
[[Category: General Modding]]