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Blending Normal Maps


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#1 Endemoniada   Members   -  Reputation: 312

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Posted 10 May 2013 - 09:31 PM

Hi guys,

 

I'd like to create my base normal map in a 3d program (3ds) by baking high poly to low, then add fine detail in either Photoshop or my own program. I did research and there doesn't seem to be a good method, they are either blended in Photoshop (bad) or in a shader; I think that's because the tutorials aren't written by programmers.

 

I was thinking I can convert the two normal maps to vectors then combine them with a weighted sum, renormalize and convert them back to a normal texture. Will that be correct ? Do I just add the vector components or do I only offset them with the binormal and tangent parts of the fine detail map. I'm not really sure how to do it.

 

Thanks.

 



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#2 AliasBinman   Members   -  Reputation: 431

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Posted 10 May 2013 - 10:15 PM

http://blog.selfshadow.com/publications/blending-in-detail/



#3 radioteeth   Prime Members   -  Reputation: 1102

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Posted 12 May 2013 - 03:04 PM

In the days of Doom3's development, using Maya, they would model all the detail they needed into the hi-poly model, then created a plugin that would spit out a low-poly model, and a normal map to 'recapture' the detail that was lost in the polycount reduction when rendered on the low-poly model.

 

That was ten years ago.






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