Original Caption:
Gunner sight.
This was actually way harder that I thought it would be; I figured I’d just slap a camera on the barrel but that was no good. Basically, the turret is turning to face the mouse, but if the camera is turning with the turret, it’ll never align and just slowly spin trying.
So you basically control the turret two different ways; smooth turn to mouse for 3rd person, and manual 1st person movement nudging in gunner view.
Parabellum 