Works very well, too. We're doing the same thing in our game engine and I'm using it all over the place to tone down or accentuate various normal maps.
--
Matthias Worch
http://www.worch.com
ML> Yeah well as I can see, D3 influence parameter will control the
ML> interpolation between the normal from the normal map and the normal from the
ML> original surface (or you can pass it another normal map in the normal input
ML> and it would use that one instead of the original surface normal to
ML> calculate the interpolation)... so yes, there is an amplitude parameter in
ML> D3.
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