Maybe this will help (note: these links will take you to our nemesis, you have been warned
):
http://answers.unity3d.com/questions/39509/portal-2-how-to-make-a-portal-in-unity-3d.htmlhttp://answers.unity3d.com/questions/455799/is-it-posable-to-make-a-gun-shoot-a-portal.htmladd player's position/angles into the portal view, so it does look like a whole into the other room (f.e.) not like a flat TV.
, the answer here is probably shaders. You may also try changing the VIEW's arc to 'warp' your flatscreen TV (perhaps also try aspect).
PS: just some random silly idea that popped up in my head, perhaps create a dummy entity for that you see in the portal but render it behind your player.
