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Left 4 Orange (Alpha)

After a decade of being buried 250 meters deep in Arctic permafrost, Valve's vault has finally thawed to reveal all the official L4D1 and 2 maps in all their pre-texture pass glory. Probably.

Actually, we may never know... but it's fun to imagine.

This mod is accomplished with 372 *.LMP files, all 5020-bytes. This whopping 2 MB modifies all 62 maps for Coop, Versus, Survival, and Scavenge. Every *.BSP map file has 64 lumps and this addon replaces 2 of them per map. Source Engine looks at these files as direct *.BSP file updates, so that means this can only be played locally or with others who also have the mod.

For technical details check inside the VPK or the following links, but the general gist: LUMP 44 STRINGTABLES were zeroed so all texture indices point to the first texture string in LUMP 43 STRINGDATA, which is the orange dev texture. To avoid summoning Satan, it's important that STRINGTABLE lump file sizes never exceed STRINGTABLE lump sizes... but you don't have to worry about that, since I padded them out tenfold and you can copy/paste the 5020-byte files and rename them to work with any custom campaign. All U/V offsets are preserved since LUMP 6 TEXINFO has that data and those lumps are left alone.

https://developer.valvesoftware.com/wiki/Source_BSP_File_Format

https://github.com/Orinuse/BSPStructsL4D2-HexEditNeo

https://github.com/Tsuey/L4D2-BSP-Lump-Editing

_FILE_GENERATION_DETAILS.TXT https://pastebin.com/r5nWJ2bj

Please let me know exact details of any issues you encounter! This mod exists to test the waters of more complex *.LMP mods in the future, including the modification of lighting and map geometry without Hammer or recompiles.