Normal maps work like texture. A 2D picture. Some programs allow you to paste a “Normal” or bumpmap to your 3D model to give an effect of 3D texture ,cracks ,bumps ,rocks. Im new to Nomad so I dont know if you can paste a “normal” or a texture onto a 3D model, but with the metcap option you can certainly make a “normal” by rendering your “metcap” design as a jpeg.