Surface fillet

Hello Grasshopper Community,

Rhino's my favorite modeler for quite a few
years now and I stumbled across Grasshopper
just a few weeks ago. Least I can say is that
I was truly amazed seeing all these well-known
functions working like a charm all wired up in
this lovely node-editor. A very fine piece
of software.

But I've got a little Problem with creating a fillet
between two Surfaces.
Basically I try to fillet 2 perpendicular
surfaces (e.g. top surface of a cylinder and the side
surface) to have a smooth transition between them.

I tried lofting a surface in between them, resulting
in a chamfer. By adding moved and resized curves
in between them I got some sort of fillet, but a fairly
bad one since it doesn't keep the continuity of the
top/side surfaces.

I attached a very simple example. The 'real' geometry
is much more complex, but I think the example
illustrates it quite well    : )

Thanks in advance

Luke


BTW: After spending lots of time trying to loft 2 curves
i finally managed to by 'flatten'ing them. Whats this
switch doing exactly?