VSI

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VSI (short for Valve Stripping Information) is a model-related file format that appears to take VTX and VVD files and remove the LOD data, for Xbox 360 versions of Source games. This is probably done to save disk and memory space. Hypothetically, it could be used on PC versions of Source (not recommended). VSI files are generated automatically by MakeGameData during the process of converting models to their proprietary console formats. It is used for processing lighting on models when converting maps.