diff --git a/libs/math/include/psemek/math/ray.hpp b/libs/math/include/psemek/math/ray.hpp
index c517d9dd..7611c51d 100644
--- a/libs/math/include/psemek/math/ray.hpp
+++ b/libs/math/include/psemek/math/ray.hpp
@@ -58,6 +58,12 @@ namespace psemek::math
 		return res;
 	}
 
+	template <typename T1, typename T, std::size_t N>
+	ray<T1, N> cast(ray<T, N> const & r)
+	{
+		return {cast<T1>(r.origin), cast<T1>(r.direction)};
+	}
+
 	template <typename T, std::size_t N>
 	std::ostream & operator << (std::ostream & os, ray<T, N> const & r)
 	{