Not on this commit, but we've gotta get the view frustum represented in some minimal global form... From a culling perspective, I think the minimal form is a view position, a quaternion for view rotation, horizontal field-of-view, vertical field-of-view, and *maybe* near and far clip.  I say *maybe* because I think far clip isn't meaningful in a world in which we are going to allow people to see an infinite distance - the neaar/far clip has to do with local rendering stuff (z-order), not really how you want to see the world.