Two things need to happen:
1. You need an Effect that supports normal mapping. The default BasicEffect in XNA doesn't handle normal or specular maps, just diffuse.
How can I do just the diffuse then with the BasicEffect? All the tutorials for BasicEffect I've found only use Diffuse as a DiffuseColor Vector. I actually have an image map for it, which I can't find resources on how to use with BasicEffect.
Also, if I need an effect other than BasicEffect, where can I find resources for it?
I checked out the Normal Mapping example on MSDN, the one with the lizard. Looks mighty complicated.

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