Originally posted by Ack-Ack
Why don't you guys do yourself a favor and search for HiTech's reasons why it's not in the game. He also explains the cause of the lag associated with adding this feature. Again, if you think you can code it, then by all means do so and prove HiTech wrong.
ack-ack
All I ever read about views and lag was in regards to mirrors which is fully understandable. However, the only problems concerning the periscope I read about were
Originally posted by SUPERFLY
It's supposed to have the to fixed 20mm's, but we had a problem with the periscope not clipping correctly with the 3d model. I don't know if or when the cannons may be enabled.
And that makes perfectly sense. For, as I pointed out, a rearward periscope is just a different point of view, not a second picture to be rendered inside a picture like a mirror. Thus basically rendering the orld view two times. Which would greatly increasy system load and probably be the source of performance / lag problems.

I don't see any difference between looking straight down and looking straight back... you do it in tailgun position too.
3D model clipping problems are a different story, though.