Odd periscope swivel on turrets

[Andrew Theel]

When turning turret from within periscope view the periscope swivels around oddly.

[Matt Hands]

Yes, see what you mean. It's a camera offset problem in cannon pawn's SpecialCalcFirstPersonView(). Offset is being applied relative to vehicle rotation, but not factoring in turret rotation (which now gets added to player's view rotation, so view rotation turns with the turret). Fixable.

[Matt Hands]

Fixed in commit 58578fb.