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+///////////////////////////////////////////////////////////////////////////////////
+/// OpenGL Mathematics (glm.g-truc.net)
+///
+/// Copyright (c) 2005 - 2012 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.
+/// 
+/// 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 core
+/// @file glm/core/func_geometric.hpp
+/// @date 2008-08-03 / 2011-06-14
+/// @author Christophe Riccio
+///
+/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a>
+/// 
+/// @defgroup core_func_geometric Geometric functions
+/// @ingroup core
+/// 
+/// These operate on vectors as vectors, not component-wise.
+///////////////////////////////////////////////////////////////////////////////////
+
+#ifndef glm_core_func_geometric
+#define glm_core_func_geometric GLM_VERSION
+
+namespace glm
+{
+	/// @addtogroup core_func_geometric
+	/// @{
+
+	/// Returns the length of x, i.e., sqrt(x * x).
+	/// 
+	/// @tparam genType Floating-point vector types.
+	/// 
+	/// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/length.xml">GLSL length man page</a>
+	/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a>
+	template <typename genType> 
+		typename genType::value_type length(
+		genType const & x); 
+
+	/// Returns the distance betwwen p0 and p1, i.e., length(p0 - p1).
+	///
+	/// @tparam genType Floating-point vector types.
+	/// 
+	/// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/distance.xml">GLSL distance man page</a>
+	/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a>
+	template <typename genType> 
+	typename genType::value_type distance(
+		genType const & p0, 
+		genType const & p1);
+
+	/// Returns the dot product of x and y, i.e., result = x * y.
+	///
+	/// @tparam genType Floating-point vector types.
+	/// 
+	/// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/dot.xml">GLSL dot man page</a>
+	/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a>
+	template <typename genType> 
+	typename genType::value_type dot(
+		genType const & x, 
+		genType const & y);
+
+	/// Returns the cross product of x and y.
+	///
+	/// @tparam valType Floating-point scalar types.
+	/// 
+	/// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/cross.xml">GLSL cross man page</a>
+	/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a>
+	template <typename valType> 
+	detail::tvec3<valType> cross(
+		detail::tvec3<valType> const & x, 
+		detail::tvec3<valType> const & y);
+
+	/// Returns a vector in the same direction as x but with length of 1.
+	/// 
+	/// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/normalize.xml">GLSL normalize man page</a>
+	/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a>
+	template <typename genType> 
+	genType normalize(
+		genType const & x);
+
+	/// If dot(Nref, I) < 0.0, return N, otherwise, return -N.
+	///
+	/// @tparam genType Floating-point vector types.
+	/// 
+	/// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/faceforward.xml">GLSL faceforward man page</a>
+	/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a>
+	template <typename genType> 
+	genType faceforward(
+		genType const & N, 
+		genType const & I, 
+		genType const & Nref);
+
+	/// For the incident vector I and surface orientation N, 
+	/// returns the reflection direction : result = I - 2.0 * dot(N, I) * N.
+	///
+	/// @tparam genType Floating-point vector types.
+	/// 
+	/// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/reflect.xml">GLSL reflect man page</a>
+	/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a>
+	template <typename genType> 
+	genType reflect(
+		genType const & I, 
+		genType const & N);
+
+	/// For the incident vector I and surface normal N, 
+	/// and the ratio of indices of refraction eta, 
+	/// return the refraction vector.
+	///
+	/// @tparam genType Floating-point vector types.
+	/// 
+	/// @see <a href="http://www.opengl.org/sdk/docs/manglsl/xhtml/refract.xml">GLSL refract man page</a>
+	/// @see <a href="http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.pdf">GLSL 4.20.8 specification, section 8.5 Geometric Functions</a>
+	template <typename genType> 
+	genType refract(
+		genType const & I, 
+		genType const & N, 
+		typename genType::value_type const & eta);
+
+	/// @}
+}//namespace glm
+
+#include "func_geometric.inl"
+
+#endif//glm_core_func_geometric