diff --git a/Lab/demo/Lab/Plugins/Mesh_3/Mesh_function.h b/Lab/demo/Lab/Plugins/Mesh_3/Mesh_function.h
index ec38a369ea0..37d59c7e0a5 100644
--- a/Lab/demo/Lab/Plugins/Mesh_3/Mesh_function.h
+++ b/Lab/demo/Lab/Plugins/Mesh_3/Mesh_function.h
@@ -139,28 +139,30 @@ QStringList
 Mesh_parameters::
 log() const
 {
+  auto is_valid = [](const double d)->bool { return d > 0. && d != DBL_MAX; };
+
   QStringList res("Mesh criteria");
 
   // doubles
-  if(edge_sizing > 0)
+  if(is_valid(edge_sizing))
     res << QString("edge max size: %1").arg(edge_sizing);
-  if(edge_min_sizing > 0)
+  if(is_valid(edge_min_sizing))
     res << QString("edge min size: %1").arg(edge_min_sizing);
-  if(edge_distance > 0)
+  if(is_valid(edge_distance))
     res << QString("edge max distance: %1").arg(edge_distance);
-  if(facet_angle > 0)
+  if(is_valid(facet_angle))
     res << QString("facet min angle: %1").arg(facet_angle);
-  if(facet_sizing > 0)
+  if(is_valid(facet_sizing))
     res << QString("facet max size: %1").arg(facet_sizing);
-  if(facet_min_sizing > 0)
+  if(is_valid(facet_min_sizing))
     res << QString("facet min size: %1").arg(facet_min_sizing);
-  if(facet_approx > 0)
+  if(is_valid(facet_approx))
     res << QString("facet approx error: %1").arg(facet_approx);
-  if(tet_shape > 0)
+  if(is_valid(tet_shape))
     res << QString("tet shape (radius-edge): %1").arg(tet_shape);
-  if(tet_sizing > 0)
+  if(is_valid(tet_sizing))
     res << QString("tet max size: %1").arg(tet_sizing);
-  if(tet_min_sizing > 0)
+  if(is_valid(tet_min_sizing))
     res << QString("tet min size: %1").arg(tet_min_sizing);
 
   // booleans