Hi Matthew,

> Expression was for shure a good recommendation, maybe that's
> a common behaviour of the export of surfaces, what do you
> think, Michael?

Yeah, well actually surfaces themselves are not even exported at all currently, only edges of surfaces are exported and they are treated the same as any other curves in the model.

If you are taking a Top view of something like an extruded solid, you probably are ending up with something like 2 curves stacked up right on top of each other, one for the top edge and one for the bottom edge, which may have something to do with what you are seeing.

So to avoid that if you are going from the Top view instead of the 3D view, you may want to not try to export the solid and instead duplicate one of its edges by copy/paste (or use the original curve you extruded) and hide the solid, so that you are controlling more exactly what you are exporting and avoiding duplicates.

- Michael