The spec file denotes the amount of sheen on the model. Light areas have lots, dark less; the model itself will determine the range. You can create them from the 'normal' file quite easily. Bump maps are different; if you're working with Adobe Photoshop (or Photoshop Elements) you'll need the Nvidia plug-in for creating .dds textures. Available
here. This will also invert the image for you when saving as a .dds file. I'd talk you through it but it's years since I did one and I need to check it out myself!! But you start from the line and rivet layers.
DaveQ
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