i think i know where the problem is.. it only works in SketchUp 8. i just tried it
really sorry about that.
i was using 7 before that

Didier's way is working with no proplems.
and this is the error message when i try to use group.volume
group.volume
Error: #<NoMethodError: (eval):41: undefined method `volume' for #Sketchup::Group:0x4d28ba0>
(eval):41

that is certainly a better way thank you.
but still group.volume still not working.
did you use it before? what would be the way to use it?
thanks

Hi Didier, Great code thank u very much it did the job for me but its always worth to learn another way so Dan here's what i was trying to do with group.volume

pt = []
pt[0] = [0,0,0];pt[1] = [100,0,0];pt[2] = [100,100,0];pt[3] = [0,100,0]
face = Sketchup.active_model.entities.add_face pt
face.pushpull -100

then i had to find out how many entities i had in the model and which of them is faces so i can add them to the group using selection.clear and selection.add

and then i add all the faces to a group and i made a few copies of it.
and i tried to use the function but it never worked.
could you demonstrate a good practice of the function?
thanks you

Guys did anyone try using group.volume function?? i've been trying to use it but it doesn't seem to work. any body came across the same thing before??

MAN U R Genius

You know when you select something and it highlights in blue or with dots, can i do that from the ruby console.
What it is i have managed to make a list of faces and identify them with names and display them on a dropdown menu in a webdialog. Now what i want is when the user chooses a face i want it to be highlighted in the model with dots just as if he would click on it.
Do i make any sense?

Guys, I have a model with 3 faces (face1, face2, face3)
how do i select any of them from the ruby console

are CloseOpens 2.0 and the Progressbar 2.0 out yet??

I’m trying to do lots of calculation that takes long time. So far it’s working fine with a progress bar although as soon as i click on another window sketchup gets frozen until the calculation is finished and i have no idea whether it will continue or i should restart the program...
Any ideas?