Hi Brian,

> I can not get the original to Shell?

Looks like there are some micro-sized folds in your surface:







That kind of situation where a surface folds back over on top of itself in a small area really throws a monkey wrench into shelling or offsetting, because the surface normal very suddenly shifts to the opposite side in those spots.

It looks like your original curves have that kind of folded over spot in them.


> but I can neither get an effective loft between the two or an edge sweep?

That folded over area is probably also giving a problem for sweeping - for lofting are you possibly trying to Loft the 2 large curves together all in one operation?

One of those curves is made up of 3 segments, and the other is made up of 8 segments - MoI doesn't really know how to best match up differing numbers of segments like this and will just average the entire shapes together, which probably does not result in what you want.

To get better results with lofting that case, you'll need to break things into their segments by using Edit/Separate, then loft it in smaller pieces (like in this case in 4 different Lofts) so that you can force the segment matching to be what you want.

Hope this helps!

- Michael