I just did this last night, I cant even remember why I suddenly got the urge - but I was actually dreaming about doing it for AGES! after seeing an illuminated 3d version of a goya painting.
I didnt think I did it right at first, but as soon as I popped out the forest bridge one I could see this thing had potential back in the 80's for some cool simulation type games.
So ive got this crazy idea about having so many layer rings around the sniper - where they spin at parallax speeds when hes strafing, and he can naturally turn to face around to rotate. I guess I could spin extra textures into them. But its a crazy idea!!! maybe itll good for an indie title, shock people with it! One thing I have no idea about, is how to walk forwards tho???