PPL
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.
Note: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.
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, which can then be used for $lightmap
.
See also
- VHV, the equivalent for vertex-lit props