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diff --git a/src/glm/gtx/vector_angle.hpp b/src/glm/gtx/vector_angle.hpp
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+++ b/src/glm/gtx/vector_angle.hpp
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+///////////////////////////////////////////////////////////////////////////////////////////////////
+// OpenGL Mathematics Copyright (c) 2005 - 2011 G-Truc Creation (www.g-truc.net)
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// Created : 2005-12-30
+// Updated : 2006-11-13
+// Licence : This source is under MIT License
+// File    : glm/gtx/vector_angle.hpp
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// Dependency:
+// - GLM core
+// - GLM_GTX_quaternion
+// - GLM_GTX_epsilon
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+#ifndef glm_gtx_vector_angle
+#define glm_gtx_vector_angle
+
+// Dependency:
+#include "../glm.hpp"
+#include "../gtx/epsilon.hpp"
+#include "../gtx/quaternion.hpp"
+#include "../gtx/rotate_vector.hpp"
+
+#if(defined(GLM_MESSAGES) && !defined(glm_ext))
+#	pragma message("GLM: GLM_GTX_vector_angle extension included")
+#endif
+
+namespace glm{
+namespace gtx{
+namespace vector_angle ///< GLM_GTX_vector_angle extension: Compute angle between vectors
+{
+	using namespace quaternion;
+	using namespace epsilon;
+
+	/// \addtogroup gtx_vector_angle
+	///@{
+
+	//! Returns the absolute angle between two vectors
+	//! Parameters need to be normalized.
+	//! From GLM_GTX_vector_angle extension
+	template <typename vecType> 
+	GLM_FUNC_QUALIFIER typename vecType::value_type angle(
+		vecType const & x, 
+		vecType const & y);
+
+	//! Returns the oriented angle between two 2d vectors 
+	//! Parameters need to be normalized.
+	//! From GLM_GTX_vector_angle extension.
+	template <typename T> 
+	GLM_FUNC_QUALIFIER T orientedAngle(
+		detail::tvec2<T> const & x, 
+		detail::tvec2<T> const & y);
+
+	//! Returns the oriented angle between two 3d vectors based from a reference axis.
+	//! Parameters need to be normalized.
+	//! From GLM_GTX_vector_angle extension.
+	template <typename T>
+	GLM_FUNC_QUALIFIER T orientedAngle(
+		detail::tvec3<T> const & x,
+		detail::tvec3<T> const & y,
+		detail::tvec3<T> const & ref);
+
+	/// @}
+}// namespace vector_angle
+}// namespace gtx
+}// namespace glm
+
+#include "vector_angle.inl"
+
+namespace glm{using namespace gtx::vector_angle;}
+
+#endif//glm_gtx_vector_angle