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diff --git a/external/include/glm/gtx/fast_trigonometry.hpp b/external/include/glm/gtx/fast_trigonometry.hpp
new file mode 100644
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+++ b/external/include/glm/gtx/fast_trigonometry.hpp
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+/// @ref gtx_fast_trigonometry
+/// @file glm/gtx/fast_trigonometry.hpp
+///
+/// @see core (dependence)
+///
+/// @defgroup gtx_fast_trigonometry GLM_GTX_fast_trigonometry
+/// @ingroup gtx
+///
+/// @brief Fast but less accurate implementations of trigonometric functions.
+///
+/// <glm/gtx/fast_trigonometry.hpp> need to be included to use these functionalities.
+
+#pragma once
+
+// Dependency:
+#include "../gtc/constants.hpp"
+
+#if GLM_MESSAGES == GLM_MESSAGES_ENABLED && !defined(GLM_EXT_INCLUDED)
+#	pragma message("GLM: GLM_GTX_fast_trigonometry extension included")
+#endif
+
+namespace glm
+{
+	/// @addtogroup gtx_fast_trigonometry
+	/// @{
+
+	/// Wrap an angle to [0 2pi[
+	/// From GLM_GTX_fast_trigonometry extension.
+	template <typename T> 
+	GLM_FUNC_DECL T wrapAngle(T angle);
+
+	/// Faster than the common sin function but less accurate.
+	/// From GLM_GTX_fast_trigonometry extension.
+	template <typename T>
+	GLM_FUNC_DECL T fastSin(T angle);
+
+	/// Faster than the common cos function but less accurate.
+	/// From GLM_GTX_fast_trigonometry extension.
+	template <typename T> 
+	GLM_FUNC_DECL T fastCos(T angle);
+
+	/// Faster than the common tan function but less accurate. 
+	/// Defined between -2pi and 2pi. 
+	/// From GLM_GTX_fast_trigonometry extension.
+	template <typename T> 
+	GLM_FUNC_DECL T fastTan(T angle);
+
+	/// Faster than the common asin function but less accurate. 
+	/// Defined between -2pi and 2pi.
+	/// From GLM_GTX_fast_trigonometry extension.
+	template <typename T> 
+	GLM_FUNC_DECL T fastAsin(T angle);
+
+	/// Faster than the common acos function but less accurate. 
+	/// Defined between -2pi and 2pi. 
+	/// From GLM_GTX_fast_trigonometry extension.
+	template <typename T> 
+	GLM_FUNC_DECL T fastAcos(T angle);
+
+	/// Faster than the common atan function but less accurate.
+	/// Defined between -2pi and 2pi. 
+	/// From GLM_GTX_fast_trigonometry extension.
+	template <typename T> 
+	GLM_FUNC_DECL T fastAtan(T y, T x);
+
+	/// Faster than the common atan function but less accurate. 
+	/// Defined between -2pi and 2pi.
+	/// From GLM_GTX_fast_trigonometry extension.
+	template <typename T> 
+	GLM_FUNC_DECL T fastAtan(T angle);
+
+	/// @}
+}//namespace glm
+
+#include "fast_trigonometry.inl"