Hi David, so right now your bottom curve is like this:



You can fix it by turning on control points, then selecting just 2 corner points at a time and using Transform > Align to make them vertically or horizontally aligned with the center point. In the align command pick the alignment point to be that middle point. You'll do the align command 4 separate times, 2 times to do a horizontal alignment and 2 times to do a vertical alignment on different pairs of corners so that they are all lined up like this:



Then you'll make a smooth single surface network once your input curves are smooth as well.

See the attached 3DM file for an example of the edited curves.

- Michael

One other easy way I've found to make multiple separate curves into one is to 1) Join them, 2) Turn on points, 3) Select the end points, 4) Delete those points, and 5) smooth out the adjacent points.

That way Moi now considers the multiple curves to be one.

That did it! Thanks for your help!

I'm so glad David!

And you know a little more about Moi. :-)

Good luck with the tutorial!

Another question. I got that first Join to work fine and I notice that you use that command often enough but it doesn't seem to work for me later in the tutorial. Lines I have no issue joining, but I'm missing something with the surfaces. At the end of your tutorial you say to join everything. What are the limits/rules of joining objects/surfaces, i know I'm missing something there but not sure what.

Thanks again for all the help!

Hi David, in order to join 2 surfaces they must have edges touching one another with no larger than a 0.005 unit gap between them. If there is too large of a space between them or if the edges are already joined to other things then either of those will prevent things from joining to one another.

If you have a case where join is not working as you had expected, please post the 3DM file with the things you are trying to join in it and then that would help to diagnose the specific problem that you are running into, it's much easier to tell you what is going wrong when looking at an actual model file rather than just a written description.

- Michael