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diff --git a/src/libraries/glm/gtx/perpendicular.inl b/src/libraries/glm/gtx/perpendicular.inl
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+///////////////////////////////////////////////////////////////////////////////////////////////////
+// OpenGL Mathematics Copyright (c) 2005 - 2012 G-Truc Creation (www.g-truc.net)
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// Created : 2005-12-21
+// Updated : 2009-03-06
+// Licence : This source is under MIT License
+// File    : glm/gtx/perpendicular.inl
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+namespace glm
+{
+	template <typename vecType> 
+	GLM_FUNC_QUALIFIER vecType perp
+	(
+		vecType const & x, 
+		vecType const & Normal
+	)
+	{
+		return x - proj(x, Normal);
+	}
+}//namespace glm