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Shadow volumes

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Hello, I've been working to use shadow volumes on PSP. The problem is that PSP does not perform clipping, it just culls off primitives wich vertices goes offscreen. So if i try to render my shadow volume the rays are culled and the shadow volume is not rendered correctly or more often it disappears. http://www.esfondo.com/snap0052.bmp http://www.esfondo.com/snap0053.bmp http://www.esfondo.com/snap0054.bmp in the last screenshot the shadow volume is culled bcz it goes over the guardband. I Was wondering if it's possible to clip the shadow volume or add caps for all the frustrum planes (left,right,bottom,top). I've tried to clip the volume using the Sutherland-Hodgman's polygon-clipping Algorithm but it didn't work. Thanks in advance

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