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Just put your replacement base mesh in your slider package (or a separate package) with the same TGI (Type, Group, and Instance ID numbers) as the game mesh. If you export the game mesh from FullBuild0 with s2pe or Postal, it'll give it a name with those three numbers built in. Do your changes without changing the numbers part of the filename (you can add to or change the name on the end), then use
S3PE to import the file to a package and it'll automatically read the ID numbers.
Example:
Export the scalp mesh as: S3_015a1849_00fb2018_000000001fa2f615_afScalp_lod0.simgeom
Modify and save as: S3_015a1849_00fb2018_000000001fa2f615_afScalp_lod0_format7.simgeom
Then import using s3pe. Don't worry about the Name, it's optional and doesn't matter in the game.