Texture prefixes
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WAD textures do not have any metadata for special textures. Instead, the first few characters in the texture's name are used to dictate what the texture is used for.
| Prefix | Texture type | Description |
|---|---|---|
{ |
Alphatest | Texels using the last index in the palette (index 255) will be treated as pure black with an alpha channel value of zero. If tied to an entity with a rendermode other than 0, said texels will be transparent.
|
! |
Liquid (water) | A liquid, usually water. The face will be drawn with ripples in the software renderer or waves in the OpenGL renderer. If part of worldspawn, it will be swimmable. If tied to an entity, only the top face will be drawn. |
!slime |
Slime | Like water, deals damage to the player and some monsters when touched (if part of worldspawn). |
!lava |
Lava | Like slime, but deals double the damage (if part of worldspawn). |
!cur_0 |
0° current | Acts like water combined with a trigger_push with a speed of 2048 in the given direction (if part of worldspawn).
|
!cur_90 |
90° current | |
!cur_180 |
180° current | |
!cur_270 |
270° current | |
!cur_up |
Upwards current | |
!cur_dwn |
Downwards current | |
+0 to +9
|
Animated/Toggled | Plays all textures in this set in sequence (at roughly 10 FPS). If tied to certain entities, such as func_wall or func_button, the sequence will toggle between numeric and alphabetic when the entity is targeted.
|
+A to +J
| ||
-0 to -9 |
Random tiling | Each time the map loads, the engine will randomly assign one of the textures in this set to each appropriate surface. In software mode, the texture changes at the edges of the texture, whereas in OpenGL mode, the texture changes at the edges of the geometry it sits on.
 Tip:This feature does not work well on surfaces which are not 240x240 texel quads. Consider combining the variations into a larger megatexture instead. |
@ |
Nonsolid visblocker | Non-solid, but still blocks VIS. Does not have backface culling. |
scroll |
Scrolling | Scrolls horizontally based upon func_conveyor speed or other entities' rendercolor
|
sky |
Sky | Not drawn in-game, but tells the engine to render the skybox behind all geometry in the current PVS.
 Bug:In OpenGL mode's non-multitextured renderer, rendering bugs occur when using multiple sky textures. |
~ |
Self-illuminated (has fullbrights) |  Deprecated:Support removed before release; only functional in Half-Life Alpha 0.52's software renderer. Nonetheless, the vanilla base game textures are still properly formatted for this feature.The last 32 colors in the palette are supposed to always be rendered at full brightness, regardless of lightmap brightness and rendermode. |
