Well normalmaps aren't very hi-def maps. They are basically used as texture maps to give that detail in there. In some ways hi-poly models are better but you would need the latest video cards and a lot of extra stuff upgraded on your computer so it would pull the game. With normalmapping the character is very low-poly yet it looks like a hi-poly with the normalmap applied to it.
Side Note: The way i see it is that rendering a normalmapped model doesn't even come close to taxing your system as a hi-poly model would. That's my opinion on this subject.
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Johnny was a chemist's son, but Johnny is no more.
What Johnny thought was H2O was H2SO4.
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