tilt :: Float -> Camera -> Camera
tilt theta c@(Camera r _ _ _) = rotation .~ r' $ c
  where r' = axisAngle (V3 1 0 0) theta * r
tilt :: Float -> Camera -> Camera
tilt theta c@(Camera r _ _ _) = rotation .~ r' $ c
  where r' = axisAngle (V3 1 0 0) theta * r
tilt theta c@(Camera r _ _ _) = rotation .~ r' $ c
  where r' = axisAngle (V3 1 0 0) theta * r