public float angle(btQuaternion q)
{
float ret = LinearMathPINVOKE.btQuaternion_angle(swigCPtr, btQuaternion.getCPtr(q));
if (LinearMathPINVOKE.SWIGPendingException.Pending) throw LinearMathPINVOKE.SWIGPendingException.Retrieve();
return ret;
}