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3d plotting, please help.

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I am good now with opengl, but I want more info on 3d. lets say I have a camera at the origin(0,0,0), looking down the -Z. if I want to plot a point a 0,1,1, what simple equation will turn that in to a 2d point. please dont give me anything incredibly complicated, or having to do with matrices(I know how to do matrix rotations already). Just the most basic way to turn a 3d point in to a 2d one.

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