The file type .fmtt is a reference for the material ID maps for models, shaders load the material ID texture and use it to load the fmtt. A condensed definition of this format would be an array of code similar to the reference below:

type public MaterialPreset = {

    F0 : float32

    RoughnessThreshold : float32

    ReflectionDependDiffuse : float32

    AnisotropicRoughness : float32

    SpecularColor : ColorRGB

    Translucency : float32

}

It should be noted that MatParamIndex_# parameters allow one material to have multiple presets assigned to it. The codeblock above is a parameter for all materials. Most notably SpecularColor. The location of these files can be found in data1.dat. There can only be 256 material presets assigned to this array.