Hi Beowulf - that looks like a side effect from doing the loft using full closed loops instead of half curves like I was using.

When you loft between closed loops, MoI needs to find an alignment point between each section, so that there isn't any twisting between sections.

MoI does some calculations to reduce twisting, but if you want a particular exact alignment you may need to adjust it manually.

When you do a Loft using closed sections, you should see a display that looks like this (while you are in the Loft command, before you push "Done" to finish it):



Those points that are displayed are the alignment points between each section - switch to the top view:



Then click and drag on those points to line them up some precise reference line, like the world y axis line:



I think that will tune up the topology to be what you want.

If you still have difficulty with this part, please post your curves as a .3dm attachment here (or e-mail to me at moi@moi3d.com) so I can check out what is happening.


When you loft between open curves there isn't this same issue because it is very clear to MoI how to connect 2 open curves together, just by aligning an endpoint to another endpoint.

- Michael