diff --git a/libs/geom/include/psemek/geom/quaternion.hpp b/libs/geom/include/psemek/geom/quaternion.hpp
index ade080aa..c5199419 100644
--- a/libs/geom/include/psemek/geom/quaternion.hpp
+++ b/libs/geom/include/psemek/geom/quaternion.hpp
@@ -17,6 +17,9 @@ namespace psemek::geom
 
 		static quaternion<T> zero();
 		static quaternion<T> identity();
+		static quaternion<T> i();
+		static quaternion<T> j();
+		static quaternion<T> k();
 		static quaternion<T> scalar(T value);
 		static quaternion<T> vector(geom::vector<T, 3> const & v);
 		static quaternion<T> rotation(T angle, geom::vector<T, 3> const & axis);
@@ -48,6 +51,24 @@ namespace psemek::geom
 		return quaternion<T>{{T(0), T(0), T(0), T(1)}};
 	}
 
+	template <typename T>
+	quaternion<T> quaternion<T>::i()
+	{
+		return  quaternion<T>{{T(1), T(0), T(0), T(0)}};
+	}
+
+	template <typename T>
+	quaternion<T> quaternion<T>::j()
+	{
+		return  quaternion<T>{{T(0), T(1), T(0), T(0)}};
+	}
+
+	template <typename T>
+	quaternion<T> quaternion<T>::k()
+	{
+		return  quaternion<T>{{T(0), T(0), T(1), T(0)}};
+	}
+
 	template <typename T>
 	quaternion<T> quaternion<T>::scalar(T value)
 	{