how I can do the clipping in open gl

[MOON-GIRL]

hi http://www.opengl.org/discussion_boards/ubb/smile.gif


i want design program have some shapes

and i want do some cliping for this shape
by add the menu
for example

*clip with a plane x=y
*the clip upper right quarter of the shape


how can i do something like that??


best regards
Moon_Girl