hi, >>>>> "Mdl" == "Mdl" <mdl78 at libero.it> writes: Mdl> Hi everybody, I'm trying to display a sphere colored Mdl> according to scalar attributes I assign to its points; I Mdl> can't see anything wrong in the code, but it doesn't Mdl> work... here it is: Try adding a line that reads: m->ScalarVisibilityOn(); cheers, prabhu