XSI: adding thikness to flat polymodels in XSI.

I have created a flat surface how do I add thikness to it in XSI?
In 3ds max there is this modifire called Shell that can do it.
I need the same effect.

Here is a way to do it:
Select all the polygons of your flat surface
Run the "duplicate polygons" command
Run the "invert polygons" command
Hit Ctrl+D
Apply a push deformer
Select all vertices and use "filter points"

So many operations instead of on modifiere like in max?
Hm..

Try the solidify script, which will do the work for you.
It could be found in the netview.

OK
Thanks a lot!