Sometimes with a 2 rail sweep there is a banking effect. It looks like this is caused by how the isocurves in the V direction relate to the rails.
Is there a way to control this?

Put more profiles! ;)

Hi bisenberger - that's usually caused by differences in length between the rails.

For a shape that should have a kind of tube like uniformity you may want to use one-rail sweep with just one rail running down the center instead of using 2-rail sweep.

To control it with 2-rail sweep you would need to add more profiles like Pilou says - and you'll need to position the profiles directly touching the rails instead of using "auto place" mode.

So for example in your case here you would want to put in another profile curve right at this location here to force the profile positioning at that point:



- Michael

You may want to construct a shape like you show there by extrusion and filleting instead of sweeping too though:









- Michael

Thanks guys,
Super helpful forum!!!

Stupid question: Is there such a thing possible as 'filleting by profile' ?

That would be a bit like trimming a solid with a curve, only that the curve follows the solid instead of a straight cut.

Hi ditto,

> Stupid question: Is there such a thing possible as 'filleting by profile' ?

Not really, because fillets don't have just one single fixed profile curve, they make an arc of a particular radius but the arc will be longer or shorter depending on the angle of how the surfaces are meeting.

See here for a bit more description on that:
http://moi3d.com/forum/index.php?webtag=MOI&msg=2457.2

So their profiles are something more that's "generated" and adapts to surrounding geometry not quite something that's easily done as a totally fixed drawn shape.


Also in addition to that juncture areas where multiple fillets come together and collide into one another don't really lend themselves to custom profiles very well either. So a "custom profile" filleter would probably only really work in certain limited circumstances, like surfaces being filleted at 90 degree angles to one another, and only 2 fillets coming together at any one point with a miter cut between them.


You can do something like use Sweep to make a profile run along an edge of a solid, and it can do mitered corners as well, but it's somewhat different from filleting.

- Michael