OK, I found the solution. You need to do the following: this->polyMapper->SetRange(min, max); -- View this message in context: http://vtk.1045678.n5.nabble.com/How-to-change-the-values-on-a-vtkScalarBarActor-tp3375118p3376266.html Sent from the VTK - Users mailing list archive at Nabble.com.