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1. Re: Normal map from a texture

   

   Reply by Jeff Parrott · May 2011 · Home› Technical Talk

   Yeah just overlay another normal map on top of another one. nDo will do it or do it by hand. Adjust the levels of the one you're laying on top to output only 1/2 of the blue channel (so instead of 0 to 255 take it down to 0 to 127/128) and set the blend mode to overlay.

2. Re: Normal map from a texture

   

   Reply by Farfarer · May 2011 · Home› Technical Talk

   So that you don't reverse the normal. 0-0.5 (or 0-127) in the blue channel means the forwards vector gets reduced so much that it points backwards. Hence the strong blue tint to tangent space normal maps, it's range in most circumstances stays within the 0.5-1 range because any less than that and it'll appear to get lit…