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quake3bsp loader need help

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i am trying to use the quake3bsp loader from this website http://www.gametutorials.com but as there are a lot of global variable, i made some changes and created a testing project(make it easiler to be ported to my project) but the problem is it doesnt work on my testing project it seems that it only draw polygon very close to the view... the testing project is here http://www.geocities.com/lstlcwterry/test2.zip (use <- -> to rotate, up_arrow for move forward and "u" going up and "d" going down) i really hope someone can help me to find out the bug... as i've spent tens of hours on it and still can't solve the problem

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I don't have any dev tools here so can't check the code, but I'll ask the obvious question - is your far clipping plane set far enough back?

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it uses the class frustum to cull polygon...
i dont even make any change in this class...
also, i have try to comment out the lines for testing if the polygon in the frustum
that is, it should draw all the polygon in the bsp tree
but still, it dont work.....

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