diff --git a/libs/geom/include/psemek/geom/interval.hpp b/libs/geom/include/psemek/geom/interval.hpp
index 461733d3..7e013ba6 100644
--- a/libs/geom/include/psemek/geom/interval.hpp
+++ b/libs/geom/include/psemek/geom/interval.hpp
@@ -91,7 +91,7 @@ namespace psemek::geom
 
 		T length() const
 		{
-			return empty() ? T{} : max - min;
+			return max - min;
 		}
 
 		T center() const
diff --git a/libs/geom/include/psemek/geom/orthographic.hpp b/libs/geom/include/psemek/geom/orthographic.hpp
index e9e303c4..b3cd224b 100644
--- a/libs/geom/include/psemek/geom/orthographic.hpp
+++ b/libs/geom/include/psemek/geom/orthographic.hpp
@@ -79,10 +79,10 @@ namespace psemek::geom
 		auto m = matrix<T, D + 1, D + 1>::zero();
 
 		for (std::size_t d = 0; d < D; ++d)
-			m[d][d] = T(2) / (r_[d].max - r_[d].min);
+			m[d][d] = T(2) / r_[d].length();
 
 		for (std::size_t d = 0; d < D; ++d)
-			m[d][D] = - (r_[d].max + r_[d].min) / (r_[d].max - r_[d].min);
+			m[d][D] = - (r_[d].max + r_[d].min) / r_[d].length();
 
 		m[D][D] = T(1);