#2 add 3D mode to Capture the Flag

[Craig Reynolds]

...A useful addition would be a 3d mode of this demo (say toggled by a function key) which would remove the constraint that all vehicles and obstacles are on the "ground plane". This would generally make the job of the pursuers easier but it would be nice to allow switching back and forth showing the same behavior in 3d and 2d...

see https://sourceforge.net/forum/message.php?msg_id=4039977