[vtkusers] How to show wireframe plus surfaces 's' + 'w'

[Louis le Grange]

Dear Users

When rendering cell data using vtkDataSetMapper one can show/switch between
surface representation or wire representation by pressing 's' or 'w'
respectively.

Could anyone please direct me on how to show wireframe lines at the same
time as surfaces - this would give a nice outline of the individual polygon
faces.

Thanks in advance, Louis