diff --git a/libs/geom/include/psemek/geom/box.hpp b/libs/geom/include/psemek/geom/box.hpp
index a4189023..e467f444 100644
--- a/libs/geom/include/psemek/geom/box.hpp
+++ b/libs/geom/include/psemek/geom/box.hpp
@@ -67,6 +67,15 @@ namespace psemek::geom
 		box & operator |= (box const & b);
 	};
 
+	template <typename T1, typename T, std::size_t N>
+	box<T1, N> cast(box<T, N> const & b)
+	{
+		box<T1, N> result;
+		for (std::size_t i = 0; i < N; ++i)
+			result[i] = cast<T1>(b[i]);
+		return result;
+	}
+
 	template <typename T, std::size_t N>
 	box<T, N> operator + (box<T, N> const & b, vector<T, N> const & delta)
 	{
diff --git a/libs/geom/include/psemek/geom/interval.hpp b/libs/geom/include/psemek/geom/interval.hpp
index 13dba04a..adf11a98 100644
--- a/libs/geom/include/psemek/geom/interval.hpp
+++ b/libs/geom/include/psemek/geom/interval.hpp
@@ -115,6 +115,12 @@ namespace psemek::geom
 		interval & operator |= (interval const & i);
 	};
 
+	template <typename T1, typename T>
+	interval<T1> cast(interval<T> const & i)
+	{
+		return {static_cast<T1>(i.min), static_cast<T1>(i.max)};
+	}
+
 	template <typename T>
 	interval<T> operator + (interval<T> const & i, T const & delta)
 	{