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diff --git a/external/include/glm/gtx/fast_square_root.hpp b/external/include/glm/gtx/fast_square_root.hpp
new file mode 100644
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+++ b/external/include/glm/gtx/fast_square_root.hpp
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+/// @ref gtx_fast_square_root
+/// @file glm/gtx/fast_square_root.hpp
+///
+/// @see core (dependence)
+///
+/// @defgroup gtx_fast_square_root GLM_GTX_fast_square_root
+/// @ingroup gtx
+///
+/// @brief Fast but less accurate implementations of square root based functions.
+/// - Sqrt optimisation based on Newton's method, 
+/// www.gamedev.net/community/forums/topic.asp?topic id=139956
+///
+/// <glm/gtx/fast_square_root.hpp> need to be included to use these functionalities.
+
+#pragma once
+
+// Dependency:
+#include "../common.hpp"
+#include "../exponential.hpp"
+#include "../geometric.hpp"
+
+#if GLM_MESSAGES == GLM_MESSAGES_ENABLED && !defined(GLM_EXT_INCLUDED)
+#	pragma message("GLM: GLM_GTX_fast_square_root extension included")
+#endif
+
+namespace glm
+{
+	/// @addtogroup gtx_fast_square_root
+	/// @{
+
+	/// Faster than the common sqrt function but less accurate.
+	///
+	/// @see gtx_fast_square_root extension.
+	template <typename genType> 
+	GLM_FUNC_DECL genType fastSqrt(genType x);
+
+	/// Faster than the common sqrt function but less accurate.
+	///
+	/// @see gtx_fast_square_root extension.
+	template <typename T, precision P, template <typename, precision> class vecType>
+	GLM_FUNC_DECL vecType<T, P> fastSqrt(vecType<T, P> const & x);
+
+	/// Faster than the common inversesqrt function but less accurate.
+	///
+	/// @see gtx_fast_square_root extension.
+	template <typename genType> 
+	GLM_FUNC_DECL genType fastInverseSqrt(genType x);
+
+	/// Faster than the common inversesqrt function but less accurate.
+	///
+	/// @see gtx_fast_square_root extension.
+	template <typename T, precision P, template <typename, precision> class vecType>
+	GLM_FUNC_DECL vecType<T, P> fastInverseSqrt(vecType<T, P> const & x);
+
+	/// Faster than the common length function but less accurate.
+	///
+	/// @see gtx_fast_square_root extension.
+	template <typename genType>
+	GLM_FUNC_DECL genType fastLength(genType x);
+
+	/// Faster than the common length function but less accurate.
+	///
+	/// @see gtx_fast_square_root extension.
+	template <typename T, precision P, template <typename, precision> class vecType>
+	GLM_FUNC_DECL T fastLength(vecType<T, P> const & x);
+
+	/// Faster than the common distance function but less accurate.
+	///
+	/// @see gtx_fast_square_root extension.
+	template <typename genType>
+	GLM_FUNC_DECL genType fastDistance(genType x, genType y);
+
+	/// Faster than the common distance function but less accurate.
+	///
+	/// @see gtx_fast_square_root extension.
+	template <typename T, precision P, template <typename, precision> class vecType>
+	GLM_FUNC_DECL T fastDistance(vecType<T, P> const & x, vecType<T, P> const & y);
+
+	/// Faster than the common normalize function but less accurate.
+	///
+	/// @see gtx_fast_square_root extension.
+	template <typename genType> 
+	GLM_FUNC_DECL genType fastNormalize(genType const & x);
+
+	/// @}
+}// namespace glm
+
+#include "fast_square_root.inl"