/*@brief Return the angle between two quaternions*/ public static double btAngle( ref btQuaternion q1, ref btQuaternion q2 ) { return q1.angle( ref q2 ); }
/*@brief Return the angle between two quaternions*/ public static float btAngle( ref btQuaternion q1, ref btQuaternion q2 ) { return q1.angle( ref q2 ); }