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Code Fix:Being always RGB888 is a VRAD limitation, not a format or engine one; a custom compiler could make DXT1, I8, or even RGBA16161616F lightmaps, and these would be properly loaded by the game.
Garry's Mod, which uses a separate _hdr.ppl for HDR lighting.
Important:To account for potential discrepancies between UV maps of LoD models, PPL files contain a lightmap for each LoD model. This can greatly increase the file size of a map if a lightmapped model has several LoD models!
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{{code fix|Being always RGB888 is a VRAD limitation, not a format or engine one; a custom compiler could make DXT1, I8, or even RGBA16161616F lightmaps, and these would be properly loaded by the game. | {{code fix|Being always RGB888 is a VRAD limitation, not a format or engine one; a custom compiler could make DXT1, I8, or even RGBA16161616F lightmaps, and these would be properly loaded by the game. | ||
To do so in the most basic manner, modify {{file|vradstaticprops|h}} to replace all mentions of IMAGE_FORMAT_RGB888 with the desired format. If used in conjunction with a modified VBSP, this could be replaced with if statements or switch cases that check for newly assigned [[static prop flags]].}} | To do so in the most basic manner, modify {{file|vradstaticprops|h}} to replace all mentions of IMAGE_FORMAT_RGB888 with the desired format. If used in conjunction with a modified VBSP, this could be replaced with if statements or switch cases that check for newly assigned [[static prop flags]]. | ||
This is fixed in {{gmod|2}}, which uses a separate {{code|_hdr.ppl}} for HDR lighting.}} | |||
{{modernImportant|To account for potential discrepancies between [[UV map]]s of [[$lod|LoD]] models, PPL files contain a lightmap for each LoD model. This can greatly increase the file size of a map if a lightmapped model has several LoD models!}} | {{modernImportant|To account for potential discrepancies between [[UV map]]s of [[$lod|LoD]] models, PPL files contain a lightmap for each LoD model. This can greatly increase the file size of a map if a lightmapped model has several LoD models!}} | ||
Revision as of 10:56, 24 January 2025
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PPL files are lightmaps (per-pixel lighting) generated by VRAD for prop_static models that have generatelightmaps enabled. Unlike brush lightmaps, PPL files are always uncompressed RGB888 (24-bit 
SDR), even when the map is compiled in HDR mode.
Code Fix:Being always RGB888 is a VRAD limitation, not a format or engine one; a custom compiler could make DXT1, I8, or even RGBA16161616F lightmaps, and these would be properly loaded by the game.
To do so in the most basic manner, modify 
vradstaticprops.h to replace all mentions of IMAGE_FORMAT_RGB888 with the desired format. If used in conjunction with a modified VBSP, this could be replaced with if statements or switch cases that check for newly assigned static prop flags.
Garry's Mod, which uses a separate _hdr.ppl for HDR lighting.Important:To account for potential discrepancies between UV maps of LoD models, PPL files contain a lightmap for each LoD model. This can greatly increase the file size of a map if a lightmapped model has several LoD models!A PPL file can be converted to uncompressed VTF(s) using Ficool2's proptexelvtf.exe (direct download), which can then be used for $lightmap.
See also
- VHV, the equivalent for vertex-lit props