Hi Michael (and all)

I asked about this the other day ... and made the drawing called 'topo' ... two of the images were done with MoI using network and the others with Rhino using network and drape.

This one is more complex and is part of a real project ... Can't get MoI to handle it (whether the outer closed line is closed or only connecting the opposite edges) though with various options it sometimes makes some really weird and playful surfaces ... sometimes taking awhile to make them.
The successful surface was done with Rhino using 'patch' ... drape and network would not work there either.

It does not seem like a very complex shape to me ... can you figure why it won't work?

thanks,
eric