diff --git a/libs/geom/include/psemek/geom/box.hpp b/libs/geom/include/psemek/geom/box.hpp
index c91bae2f..3e1c1512 100644
--- a/libs/geom/include/psemek/geom/box.hpp
+++ b/libs/geom/include/psemek/geom/box.hpp
@@ -292,4 +292,17 @@ namespace psemek::geom
 		return expand(b, -d);
 	}
 
+	template <typename T, std::size_t N>
+	box<T, N> span(point<T, N> const & p1, point<T, N> const & p2)
+	{
+		box<T, N> b;
+		for (std::size_t i = 0; i < N; ++i)
+		{
+			b.axes[i] = {p1[i], p2[i]};
+			if (b.axes[i].min > b.axes[i].max)
+				std::swap(b.axes[i].min, b.axes[i].max);
+		}
+		return b;
+	}
+
 }