Luxel

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A lightmap pixel. The "lightmap scale" or "luxel scale" is the number of units per luxel.

In Source Source and Source 2 Source 2, luxels can be visualised with mat_luxels 1.

Icon-Bug.pngBug:This command is broken in Source 2009, Source Multiplayer[confirm] and Source 2013 Singleplayer Source 2013 Singleplayer and doesn't display correctly, due to missing shaders (see GitHub issues #3803). This issue is not affected in Team Fortress 2 branch games (Counter-Strike: Source, Day of Defeat: Source, Half-Life Deathmatch: Source, Half-Life 2: Deathmatch, Team Fortress 2), most Source 2013 Multiplayer games and both legacy and 2025 version of Source SDK Base 2013.
Remains unfixed on Half-Life 2 (20th anniversary).  (tested in: Team Fortress 2 branch, Half-Life 2 20th, Half-Life 2 2012 build)
Icon-Bug.pngBug:This command crashes the game on Postal III Postal III when enabled.