[Algorithms] View Frustum Culling

[Tim J. <ti...@gn...>]

What is the best method for coarse bounding box frustum culling?

From what I can gather you either use axis aligned bound boxes (AABBs) =
or oriented bounding boxes (OBBs), with OBBs having the advantage of =
tighter fitting but need extra computations for the culling process. =
Also which culling method is best, perspective transform the BB and the =
view frustum to the perspective coordinate system (which with AABBs can =
result in testing two AABBs which is just 6 comparisons, however you =
have to transform all 8 vertices of the AABB) or testing the BB against =
the 6 planes of the view frustum (which seems much simpler and =
straightforward if that is all that is needed.)

So is comparing AABBs against the frustum planes the best way to go and =
is it just find the equations and test the vertices or is there some =
more transforming needed in there?

Also what are the extra steps needed to use OBBs instead?

And finally a nice easy question, what is the right way to get the 6 =
equations of the planes if you happen to have an OpenGL matrix?

Any help would be great
thanks,

Tim.