gluUnproject (or similar) could help.. just throw in the 8 signed-unit-cube coords..

then again, thats just a blind guess..

you could as well search for a point intersection_of(plane a,plane b,plane c) code, and just intersect all combinations of planes for the points..

Q1:

How do I extract the 8 vertices of a frustum ?

I can calculate the 6 planes, and I have the result in frustum[6][4]…

But how do I now extract the 8 frustum verts from that ???

Q2:

Is there any opengl extension that extracts the frustum ?

Thank you.