[osg-users] How to implemente this simple function?

[方之]

Hello all :  I want to implemente this function, only to render the fixed distance  from the viewer current position, and I can't use thegetProjectionMatrixAsFrustum function correct: I use the following codes, but the result is very strange: viewer ->getCamera() ->setProjectionMatrixAsFrustum(-10,10,-10,10,100,200) ; I want the viewer only to render the distance between 100 and 200 from the viewer current position. I will gratitude for giving me some Tutorials
........ Sorry for my poor EN.                                                         ShiTou                                                              2007.9.9.   
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