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im so weak in math/physics!!

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Newton GD.

PhysX.

Or better still, learn a bit about two or three before deciding. Once you get the ball rolling in one, you will be aware of the principles behind the others. Not only will you get the experience of installing new libraries, but you will be able to choose the one you like best.

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Personally, I'd recommend getting educated about some of the theory and background, in general, before trying to choose a library. A fantastic tutorial is given each year at the GDC conference, by Jim van Verth and his Merry Men (er....). You can find the Powerpoint at the following link. Really, these presentations are very well done, and should help even if you are somewhat weak in 3D/geometry/math:

Essential Math for Games Programmers. Go through the presentations in order.

Another thing...there is a sticky thread in this forum that lists the various physics engines and some resources. Doesn't directly answer your question, but you may find it useful.

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I don't have an electronic copy of the 2008 version, but the link to the 2007 version works. The 2007 slides shouldn't be hugely different, if at all. But, for beginners I would start at the beginning. There are useful concepts on collision detection even in the overview presentation.

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You may like the book then (Essential Mathematics for Games and Interactive Applications... whew, long title). I own it and it's a very good book. You need a somewhat good understanding of mathematics before reading it though, if you want to understand everything.

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