View source for Detail textures (GoldSrc)

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'''Detail textures''' in {{gldsrc|4.1}} are textures that are overlaid on a [[WAD]] texture to increase the perceived detail of the surface, without increasing texel size (which would result in using up more [[AllocBlock]]). They are extensively used by {{dod|4.1}} (since version 1.2) and {{czero|4.1}}.

Unlike {{Src|3.1}}, detail textures in {{gldsrc|3.1}} always use [[DecalModulate]], and are always 24-bit.
{{bug|Detail textures are broken in the latest HL25 builds and may not display correctly when scaled.}}
{{modernImportant|'''<big>Don't rely upon detail textures for a map to look "correct"!</big>'''<br>
Users whose GPUs have blocked the {{code|GL_ARB_multitexture}} extension (such as for {{pcgw|Half-Life#OpenGL_overbright_lighting|enabling overbright lighting}} on pre-25th anniversary versions of the engine) will not see detail textures.<br>
Additionally, users are able to disable detail textures via the {{code|r_detailtextures}} [[cvar]] or the video settings menu.
{{note|Detail textures are also unavailable in [[software mode]], but that comes with a bunch of other limitations and is often disregarded.}} }}
{{bug|Detail textures may not work using the native {{linux|4.1}} binaries. ([https://github.com/ValveSoftware/halflife/issues/1688 relevant issue on GitHub])
{{workaround|Use the {{win|4.1}} binaries via {{w|Proton (software)|Proton|icon=hide}} instead.}}
}}
{{bug|Non-power-of-two detail textures do not display correctly when Mipmapping is enabled (broken since late 2019 NPoT update; [https://github.com/ValveSoftware/halflife/issues/3148 relevant issue on GitHub]). Power-of-two detail textures work fine on non-power-of-two WAD textures.
}}
{{note|Detail textures can only be used on [[BSP (GoldSrc)|BSP]] and [[WAD]] textures. To allow more detail to be added to an [[MDL (GoldSrc)|MDL]] texture, use a higher resolution canvas, as MDL textures aren't subject to AllocBlock (since they aren't lightmapped). UVs can also be realigned to use more textures, if a max-resolution 512x512 (1024x1024 in {{sven}}) canvas is insufficient.{{tip|Use {{hlam|4}} to enable mipmaps for such high-resolution textures, in order to greatly reduce shimmering on the textures when at a distance.}} }}
{{note|Detail texture scale cannot go lower than 1, unlike Source. To reduce repetition on large surfaces, use [[megatexture]]s.}}
==External links ==
* [https://the303.org/tutorials/gold_texture_p9.htm The303's GoldSrc texture tutorial - Part 9: DETAIL Textures]

[[Category:GoldSrc Textures]]