the viewing frustrum's planes

[tepid]

hiya all,
I may well be being dense here, but....
does anyone know how to calculate the 6 planes of the viewing frustrum once you have defined it using gluPerpective()? cant seem to figure it out.
Tepid

[CoBour]

Try this:
http://www.opengl.org/discussion_boards/ubb/Forum2/HTML/002488.html

[zed]

also code in the faq (link first page)