Produce tangent space normal map from two object space normal maps?

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  02 February 2014
Produce tangent space normal map from two object space normal maps?

This is a weird question, but there's this odd trick I want to try.

What I have is the object space normal map of a low res mesh, and then the object space normal map of a high res mesh projected onto the low res mesh.

I am looking for something that can take these two normal maps, and somehow difference the details of them to give me a tangent space normal map. Does this exist?
 
  02 February 2014
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