Hi there,
I am just trying a little sweep operation, but I get a twisted result (see pictures). Any ideas what might be the problem here.
Regards
Heiner

Please post .3dm file.
Is it flat or freeform?

Hi Heiner, yes could you please post the 3DM file with your sweep curves in it so I can try to repeat the sweep over here and try to figure out what's going wrong?

It could be some bug in the profile direction matching mechanism inside the sweep function. But I can't really tell without being able to try the sweep over here.

One workaround for the time being might be to just leave out the middle profile curve and only do the sweep by selecting the first and last profile curves only.

If your profile curves are made up of sub-segments it could also be that you're getting some unwanted segment-to-segment matching, and you may need to get the segments to be simplified into one single curve rather than a bunch of smaller segments by using something like the Rebuild command (http://moi3d.com/3.0/docs/moi_command_reference10.htm#rebuild) - the segmentation structure of the profile curves would be one of the things I would have looked at in the 3DM file if that was available, you can't really see many types of inner structural details like that from a screenshot alone.

- Michael

Hmmm,
I think I really will have to alter my way of working: Since MOI is so
intuitive, I proceed always so fast, and very often just delete stuff which
is not working as I want and go another way, as I did with this one.
In short, somehow that file wit that problem as you see it on the
pics is no more :-(
The only thing I can say is, that I usualy do a rebuild with all curves I
work with in order to get as little CPs as possible. In case of such sweep
things, I always look, that the amount of CPs in the shapes is similar.
Anyway,
problem is gone for now, if I run into something like that again, I will
keep the file.
Sorry and Thanks,
Heiner

Here is a curve made with freeform command, which yields a good freeform sweep, but a bad flat sweep.
- Brian

Hi Brian,

You won't use 'Flat' option Sweep for such a shape, the 'Flat' option is mainly used to control or force a multi sided profile in either X,Y or Z direction along an axially produced rail.

For example; the attached file produces the opposite what you have Bad 'Freeform', Good 'Flat'.

-

Hi

sometimes if your profile gets flipped or you select the wrong part of it the sweep does a 180 twist as if sweeps

I would try flipping the left hand circle with points on 180 degrees and see if it changes the sweep error





he is an example the centre circle has the wrong orientation






cheers
shayne