Didier, thank you for ALL your ruby scripts at your site... found a couple new ones I hadn't seen before.

you have a tiny glitch...
http://www.crai.archi.fr/RubyLibraryDepot/Ruby/Roof-v2-1.zip is missing the '.zip' in the link, so that it's a broken link. I just added the ".zip" to my address line, and it d/ls just fine.

thanks again for your site.
The pushpull multiple faces with 2 selected points is going to be my new favorite tool! It's just what I came here looking for!