ells and offset it and then split it.
1) extrude the origional surface
2)make a 3D voronoi around it
3) find the intersecting surfaces of the two geometries
4)hide the rest
5) offset the surfaces to give some thickness to the material
6)split the polysurface with the origional voronoi
Or
4) use weaverbird window (I think it's called, the green square with a hole in it)
5)split the polysurface with the origional voronoi…
Added by Jack Young at 1:00am on November 29, 2016