Hi s7r83dg3 - yes that's correct. One of the big focus areas for joining curves is to form a closed loop that will define a region, so that an inside and outside of the region is defined.
So because of that, joining curves is focused on gluing 2 segments that touch each other end-to-end (and continuing like this to form a linked chain going in a single direction).
When you have something like 3 segments that radiate out from a single point, those cannot be all joined to one another because it would not form a single oriented chain.
So this part of how curves work is not like how a polygon modeler works where you have just a bunch of points and then you connect them together with polygons any which way you want.
Several kinds of operations in MoI will make use of a closed region to do various things, like if you have a closed curve and extrude it, it will automatically get capped. If you have a closed curve and you use it as a boolean cutter, it will carve a hole in the other object. That's because a closed curve is able to then define a closed volume and act as a solid.
If you're still having problems with your lines, could you please post a 3DM file with what you are working with, that would help to give you some specific suggestions.
Some things that may apply are to possibly to duplicate one segment by copy/paste if you want to make 2 closed loops that touch each other along one segment, or if you are doing some kind of an array to arrange pieces you may want to join together your source piece into a closed curve first before doing the array.
- Michael
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