But setting FaceAlpha to 0.1 don't have any effect. I'm I doing something wrong here?
octave --version GNU Octave, version 3.2.3 Copyright (C) 2009 John W. Eaton and others.
This is free software; see the source code for copying conditions. There is ABSOLUTELY NO WARRANTY; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Octave was configured for "x86_64-unknown-linux-gnu".