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normal map question

polycounter lvl 3
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micropolius polycounter lvl 3
Hi I have a question about normal maps baked with MikkTspace.
What is the correct way to combine normal maps? With combining I mean : adding a detail normal map on top of a existing normal map.
I have baked a normal map inside Substance Painter 2 and I have a diamond checker pattern with Quixel NDO. What is the correcty way to combine these 2 maps and reimport them back inside Substance painter 2?
normal map + detail normal map + overlay blend doesn't seem right to me. 



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