Hi Steve,
> I just looked at creating the blend in Rhino4, the results will
> help to show what I mean:-
Yup, that is actually the same problem, if you look at the ends of each of those isoparms, it is a slanted type arrangement.
Basically, you can kind of imagine that blending first creates a set of lines that are connected between the 2 edges.
That line is then converted into a smooth curve segment, and the length of the line determines a kind of "bulge factor" for the shape.
When the line is slanted, it has a bigger length than a non-slanted one, and that bigger length causes too much bulging of the smooth part.
The key to preventing this is getting better matching points between the curves.
- Michael
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