Snycing Clipmap Cube Face Cenetrs

Well i am having a problem trying to snc the clipmap cube face centers from my procedural planet renderer, im very stuck at the moment. I want to get the same cube center no matter were the camera is i think i need some sort of projection. heres a pic of the clipmaps synced, but they do that as i move away and when i move close the move away from me. Anybody got any ideas.





Maybe i could have some sort of virtual box and project, from the camera and get an x,z coord on that box, just a bit stumped on how to go about it.

Any ideas will be great.