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diff --git a/src/glm/gtx/extend.inl b/src/glm/gtx/extend.inl
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+///////////////////////////////////////////////////////////////////////////////////////////////////
+// OpenGL Mathematics Copyright (c) 2005 - 2011 G-Truc Creation (www.g-truc.net)
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// Created : 2006-01-07
+// Updated : 2008-10-05
+// Licence : This source is under MIT License
+// File    : glm/gtx/extend.inl
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+namespace glm{
+namespace gtx{
+namespace extend{
+
+template <typename genType>
+genType extend
+(
+	genType const & Origin, 
+	genType const & Source, 
+	genType const & Distance
+)
+{
+    return Origin + (Source - Origin) * Distance;
+}
+
+template <typename valType>
+detail::tvec2<valType> extend
+(
+	detail::tvec2<valType> const & Origin, 
+	detail::tvec2<valType> const & Source, 
+	valType const & Distance
+)
+{
+    return Origin + (Source - Origin) * Distance;
+}
+
+template <typename valType>
+detail::tvec3<valType> extend
+(
+	detail::tvec3<valType> const & Origin, 
+	detail::tvec3<valType> const & Source, 
+	valType const & Distance
+)
+{
+    return Origin + (Source - Origin) * Distance;
+}
+
+template <typename valType>
+detail::tvec4<valType> extend
+(
+	detail::tvec4<valType> const & Origin, 
+	detail::tvec4<valType> const & Source, 
+	valType const & Distance
+)
+{
+    return Origin + (Source - Origin) * Distance;
+}
+
+}//namespace extend
+}//namespace gtx
+}//namespace glm