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1 files changed, 36 insertions, 0 deletions

diff --git a/include/gal/opengl/glm/gtx/closest_point.inl b/include/gal/opengl/glm/gtx/closest_point.inl
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+++ b/include/gal/opengl/glm/gtx/closest_point.inl
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+///////////////////////////////////////////////////////////////////////////////////////////////////
+// OpenGL Mathematics Copyright (c) 2005 - 2013 G-Truc Creation (www.g-truc.net)
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// Created : 2005-12-30
+// Updated : 2008-10-05
+// Licence : This source is under MIT License
+// File    : glm/gtx/closest_point.inl
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+#ifndef glm_gtx_closest_point
+#define glm_gtx_closest_point
+
+namespace glm
+{
+	template <typename valType> 
+	GLM_FUNC_QUALIFIER detail::tvec3<valType> closestPointOnLine
+	(
+		detail::tvec3<valType> const & point, 
+		detail::tvec3<valType> const & a, 
+		detail::tvec3<valType> const & b
+	)
+	{
+		valType LineLength = distance(a, b);
+		detail::tvec3<valType> Vector = point - a;
+		detail::tvec3<valType> LineDirection = (b - a) / LineLength;
+
+		// Project Vector to LineDirection to get the distance of point from a
+		valType Distance = dot(Vector, LineDirection);
+
+		if(Distance <= valType(0)) return a;
+		if(Distance >= LineLength) return b;
+		return a + LineDirection * Distance;
+	}
+}//namespace glm
+
+#endif//glm_gtx_closest_point