i think its normals but information on the subject tells me its just for taking high poly detail and baking it into a texture to give the appearance of detail.
You can either use displacement, normals or just painting them in the diffuse/specular.
with normals or displacement you can have light reflecting off the scratch to make it look a bit deeper, but for small surface scratches just painting them in the diffuse/spec should be sufficient
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with normals or displacement you can have light reflecting off the scratch to make it look a bit deeper, but for small surface scratches just painting them in the diffuse/spec should be sufficient