--- a/src/types/matrix.h	Sat Feb 18 02:02:29 2017 +0200
+++ b/src/types/matrix.h	Mon Feb 20 07:56:21 2017 +0200
@@ -18,6 +18,7 @@
 
 #pragma once
 #include <QString>
+#include "../glShared.h"
 
 /*
  * A mathematical 3 x 3 matrix
@@ -53,6 +54,7 @@
 	const double& operator()(int row, int column) const;
 
 	static const Matrix identity;
+	static Matrix fromRotationMatrix(const GLRotationMatrix& rotationMatrix);
 
 private:
 	double m_values[9];