21 #include "../trigonometric.hpp"    22 #include "../exponential.hpp"    27 #if GLM_MESSAGES == GLM_ENABLE && !defined(GLM_EXT_INCLUDED)    28 #   pragma message("GLM: GLM_EXT_quaternion_trigonometric extension included")    40     template<
typename T, qualifier Q>
    41     GLM_FUNC_DECL T 
angle(qua<T, Q> 
const& x);
    47     template<
typename T, qualifier Q>
    48     GLM_FUNC_DECL vec<3, T, Q> 
axis(qua<T, Q> 
const& x);
    57     template<
typename T, qualifier Q>
    63 #include "quaternion_trigonometric.inl" GLM_FUNC_DECL qua< T, Q > angleAxis(T const &angle, vec< 3, T, Q > const &axis)
Build a quaternion from an angle and a normalized axis. 
GLM_EXT_vector_relational 
GLM_FUNC_DECL vec< 3, T, Q > axis(qua< T, Q > const &x)
Returns the q rotation axis. 
GLM_FUNC_DECL T angle(qua< T, Q > const &x)
Returns the quaternion rotation angle.