IrisTex Eye Iris Texture(s), Right eye is optional.Texture format : followed by Texture filename : 0 or 1 for mipmaps : 0 or 1 for gamma or linear colorspace You do not need to provide all the textures, recommended min Body/Face for Direct injecting so you have matching head/body.
Overlay: Up-scales default compiled texture to Injecting texture(s) resolution preserving Suntan,Mole,Tattoo etc and Overlays Injecting Texture(s) on top based on Alpha channel. Direct: replaces skin texture completely ignoring most textures that are compiled before game play ie.