View source for Texture prefixes

{{goldsrc topicon}}
[[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.

{| class="wikitable"
|-
! Prefix !! Texture type !! Description 
|-
| {{code|{}} || 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 {{code|rendermode}} other than 0, said texels will be transparent.
|-
| {{code|!}} || 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.
Palette index 3 is used to control fog color, and the red value of palette index 4 is used to control fog thickness (with 255 being maximum fog).
{{bug|hidetested=1|Liquids are always fullbright in the vanilla renders, but most compilers still generate lightmaps for them anyway, due to expecting {{quake|2}}'s prefix of {{code|<nowiki>*</nowiki>}} instead. This will not affect the engine's [[allocblock]] limit, as they aren't actually loaded{{confirm}}. {{tip|If there is a significant amount of water in a map, the BSP size can be reduced by flagging the water surfaces as "special" in {{newbspguy|4.1}}, then recompiling RAD. Alternatively, use [[ericw-tools]] and add {{code|_splitturb 0}} to worldspawn. For [[func_water]], [[VHLT]]'s {{code|zhlt_striprad}} can be used.}} }}
|-
| {{code|!slime}} || Slime || Like water, deals damage to the player and some monsters when touched (if part of worldspawn).
|-
| {{code|!lava}} || Lava || Like slime, but deals double the damage (if part of worldspawn).
|-
| {{code|!cur_0}} || 0° current
| rowspan=6 | Acts like water combined with a {{ent|trigger_push (GoldSrc)|alt=trigger_push}} with a speed of 2048 in the given direction (if part of worldspawn).
|-
| {{code|!cur_90}} || 90° current
|-
| {{code|!cur_180}} || 180° current
|-
| {{code|!cur_270}} || 270° current
|-
| {{code|!cur_up}} || Upwards current
|-
| {{code|!cur_dwn}} || Downwards current
|-
| {{code|+0}} to {{code|+9}}
| rowspan=2 | Animated/Toggled
| rowspan=2 | Plays all textures in this set in sequence (at roughly 10 FPS). If tied to certain entities, such as {{ent|func_wall (GoldSrc)|alt=func_wall}} or {{ent|func_button (GoldSrc)|alt=func_button}}, the sequence will toggle between numeric and alphabetic when the entity is targeted.
|-
| {{code|+A}} to {{code|+J}}
|-
| {{code|-0}} to {{code|-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.}}
|-
| {{code|@}} || Nonsolid visblocker || Non-solid, but still blocks [[VIS]]. Does not have backface culling.
|-
| {{code|scroll}} || Scrolling || Scrolls horizontally based upon {{ent|func_conveyor (GoldSrc)|alt=func_conveyor}} {{code|speed}} or other entities' {{code|rendercolor}}
|-
| {{code|sky}} || Sky || Not drawn in-game, but tells the engine to render the skybox behind all geometry in the current PVS.
{{bug|hidetested=1|In [[OpenGL]] mode's non-multitextured renderer, rendering bugs occur when using multiple {{code|sky}} textures.}}
|-
| {{code|xeno_grapple_}} || {{op4}} Grapple point || Textures with this prefix can be hooked onto with {{op4}} {{ent|weapon_grapple (Opposing Force)|alt=weapon_grapple}}
|-
| {{code|~}} || Self-illuminated (has fullbrights) || {{modernDeprecated|Support removed before release; only functional in Half-Life Alpha 0.52's [[software renderer]]. Nonetheless, many of 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.<br>Unlike other prefixes, this prefix can be used in conjunction with the animated/toggled texture prefix (ex {{code|+0~}}).
|-
| {{code|__rad}} || Generated by [[HLRAD]] || Textures generated for brush entities using [[VHLT]]'s [[template:Hl1 kv zhlt|zhlt_embedlightmap]] feature are given this prefix.
|}

== See also ==
* [[Tool textures (GoldSrc)]]

[[Category:GoldSrc Textures]]