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Normal mapping is an efficient technique for simulating bumps and wrinkles on the surface of an object by perturbing the surface Normals to redirect light that hits the surface of the object.

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How to mask normal maps or How to select and apply portions of normal map?

I have normal map that is fed to "Diffuse and Glossy" shaders. but I don't want to use or mask portion of the normal map. How to mask portion of the normal map or in other words how to apply portion …
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