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three light system and multipass?

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i'm got an advice on the three point lighting system, this:
I've read and tried it in fxcomposer in an example and i have obtained a good result.
now i must use the shader in xna
my problem now is :
1)i must do a multipass shader where each pass i binds one light or is better create a shader and pass three lights as a parameter?
what are the pro and cons
2)how calculate the position of the three lights from the three angle that is known


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