jcl, but i'd needed to run through all panels each frame(compare their orientation)... I'm afraid, it would be little bit slow.

I solved this, just checking position of camera (looking like its the fastest method), and hiding some panels, if camera.pan<a1 and camera.pan>a2
I was just curious if there are(or, probably, "would be") some kinds of culling in nearest time? I think that it could be useful in large numbers of another cases, where camera position would'nt be enough.