Dear Ziad,
thank you very much - the keys work perfectly! May I perhaps ask you to implement two more options?
-) key '.' in the surface viewer
-) option "shw 0" in the surface controller
The idea is to automatically generate pdf-files with certain standard parameters and views in order to produce the same graphics with different samples. Regarding the examples: they put the idea of producing this script in my head. I will post it, when I get it working in a reasonably generalized way...
-Wolfgang