Things You'll Need
Instructions
Find the SKN file that you want to convert into a new body mesh. Move this file to a separate folder or the desktop.
Open the Skn2Obj software and covert the SKN file to a SPJ file. This breaks the file into a SPJ file, a MTL file and an OBJ file.
Open the OBJ file in your 3D modeling program. Modify the mesh by changing colors, patterns and moving the vertices to change the shape of the mesh. Do not add or delete any vertices or else you will ruin the body mesh. Save the modified OBJ file with the same file name as the original.
Open the SPJ file attached to that mesh and save it as a SKN file using Skn2Obj.
Open the new body mesh SKN file in Sim Show. If the mesh shows up and looks correct in Sim Show, click the ̶0;Import̶1; button to import the new skin into the Sims game.