I am trying to use the polyframe plugin for rhino. I have a bunch of surfaces grouped in an upside down pyramid shape. To get the desired result, I want to stretch the surfaces upwards, but keeping the middle the same:
The form on the right is what I currently have and the one on the right is what I want to get. (more or less-I just made them to illustrate my point).
Here is my file with the surface group.