/*@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 );
}