Extrude with keeping original faces?

[vyder]

hi guys...i am working on modelling a wall from a polygon plane. now that i have gotten the right look of the wall with windows in it etc. i want to extrude that wall. when i extrude the wall, the original face of the wall is placed at the new extruded position. how do i extrude a plane so that it keeps the original polygons (and creates new ones for the other side of the wall) so that my wall have have a thickness?

thanks

[failure]

Isn't it irelevant? I mean when you extrude, you get one more face that is exactly like starting one. How can you tell which one is original?

[vyder]

ok..to put this simply...when i extrude...i would like BOTH sides to be filled. have you ever used eds max? if i extrude a plane...i get a thickness to my extrude. it is all enclosed with polygons. when i do the same in maya...the faces move with the extrusion. what i have had to do is copy the polygons...then extract them. that creates a closed object. then i have to combine the polygons and merge all the vertices...just want to know if there is a simpler way.

peace

[failure]

You'll get wanted behavior if you extrude the whole poly shell. In other words - if all you have in this object is that one face.
If there are some adjacent faces, maya will not do it because it would produce non-manifold geometry, which is considered a bad thing.