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diff --git a/inc/glm/gtx/vector_angle.inl b/inc/glm/gtx/vector_angle.inl
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+++ b/inc/glm/gtx/vector_angle.inl
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+///////////////////////////////////////////////////////////////////////////////////
+/// OpenGL Mathematics (glm.g-truc.net)
+///
+/// Copyright (c) 2005 - 2015 G-Truc Creation (www.g-truc.net)
+/// Permission is hereby granted, free of charge, to any person obtaining a copy
+/// of this software and associated documentation files (the "Software"), to deal
+/// in the Software without restriction, including without limitation the rights
+/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+/// copies of the Software, and to permit persons to whom the Software is
+/// furnished to do so, subject to the following conditions:
+/// 
+/// The above copyright notice and this permission notice shall be included in
+/// all copies or substantial portions of the Software.
+/// 
+/// Restrictions:
+///		By making use of the Software for military purposes, you choose to make
+///		a Bunny unhappy.
+/// 
+/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+/// THE SOFTWARE.
+///
+/// @ref gtx_vector_angle
+/// @file glm/gtx/vector_angle.inl
+/// @date 2005-12-30 / 2011-06-07
+/// @author Christophe Riccio
+///////////////////////////////////////////////////////////////////////////////////
+
+namespace glm
+{
+	template <typename genType> 
+	GLM_FUNC_QUALIFIER genType angle
+	(
+		genType const & x,
+		genType const & y
+	)
+	{
+		GLM_STATIC_ASSERT(std::numeric_limits<genType>::is_iec559, "'angle' only accept floating-point inputs");
+		return acos(clamp(dot(x, y), genType(-1), genType(1)));
+	}
+
+	template <typename T, precision P, template <typename, precision> class vecType> 
+	GLM_FUNC_QUALIFIER T angle
+	(
+		vecType<T, P> const & x,
+		vecType<T, P> const & y
+	)
+	{
+		GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'angle' only accept floating-point inputs");
+		return acos(clamp(dot(x, y), T(-1), T(1)));
+	}
+
+	//! \todo epsilon is hard coded to 0.01
+	template <typename T, precision P>
+	GLM_FUNC_QUALIFIER T orientedAngle
+	(
+		tvec2<T, P> const & x,
+		tvec2<T, P> const & y
+	)
+	{
+		GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'orientedAngle' only accept floating-point inputs");
+		T const Angle(acos(clamp(dot(x, y), T(-1), T(1))));
+
+		if(all(epsilonEqual(y, glm::rotate(x, Angle), T(0.0001))))
+			return Angle;
+		else
+			return -Angle;
+	}
+
+	template <typename T, precision P>
+	GLM_FUNC_QUALIFIER T orientedAngle
+	(
+		tvec3<T, P> const & x,
+		tvec3<T, P> const & y,
+		tvec3<T, P> const & ref
+	)
+	{
+		GLM_STATIC_ASSERT(std::numeric_limits<T>::is_iec559, "'orientedAngle' only accept floating-point inputs");
+
+		T const Angle(acos(clamp(dot(x, y), T(-1), T(1))));
+		return mix(Angle, -Angle, dot(ref, cross(x, y)) < T(0));
+	}
+}//namespace glm