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gluUnProject - How to

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I want to know how to implement gluUnProject. i dont use it because gluUnProject inverts the modelview and projection matrix (i think so) but i already have them on the fly... So i only want to know the pseudo-code for my implemention of gluUnProject... Thanks

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check out my response in the other thread
http://www.gamedev.net/community/forums/topic.asp?topic_id=60077

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