Combining tangeants with geometry normals

["Bernard Lebel" <3dbernard(at)gmail.com>]

Hello,

I'd like to know, if anyone has any idea, how is the XSINormalMap
shader combining tangeants and interpolated geometry normals.



Let say the tangeants look like this:
http://www.bernardlebel.com/img_remote/3D/XSI/XSINormalMap_tangeantinput.jpg

Now, let say the interpolated normals look like this:
http://www.bernardlebel.com/img_remote/3D/XSI/XSINormalMap_interpnormalsi.jpg

Then, when combined in the XSINormalMap shader, the output is this:
http://www.bernardlebel.com/img_remote/3D/XSI/XSINormalMap_output.jpg


I have no clue whatsoever how is this result achieved. I'm trying to
implement it into my own shader (C++), but am blocked at that point.



Thanks
Bernard
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