-// useful constant angles
-static const Radian ANGLE_360 = Radian( Math::PI * 2.f ); ///< 360 degree turn in radians
-static const Radian ANGLE_315 = Radian( Math::PI * 1.75f ); ///< 315 degree turn in radians
-static const Radian ANGLE_270 = Radian( Math::PI * 1.50f ); ///< 270 degree turn in radians
-static const Radian ANGLE_225 = Radian( Math::PI * 1.25f ); ///< 225 degree turn in radians
-static const Radian ANGLE_180 = Radian( Math::PI ); ///< 180 degree turn in radians
-static const Radian ANGLE_135 = Radian( Math::PI * 0.75f ); ///< 135 degree turn in radians
-static const Radian ANGLE_120 = Radian( Math::PI * 2.f/3.f ); ///< 120 degree turn in radians
-static const Radian ANGLE_90 = Radian( Math::PI_2 ); ///< 90 degree turn in radians
-static const Radian ANGLE_45 = Radian( Math::PI_4 ); ///< 45 degree turn in radians
-static const Radian ANGLE_60 = Radian( Math::PI / 3.f ); ///< 60 degree turn in radians
-static const Radian ANGLE_30 = Radian( Math::PI / 6.f ); ///< 30 degree turn in radians
-static const Radian ANGLE_0 = Radian( 0.0f ); ///< 0 degree turn in radians
-