Hi oliver, step-by-step goes like this.
First, I opened up your braun_1.3dm file, and selected these 2 long curves:
Next I ran the Edit / Trim command. This brings up a prompt like this:
In this particular case, you need to uncheck that "Project intersections" option, or else things will get cut up into more pieces than we want in this situation. So uncheck that and then push "Done". By pushing Done here without selecting anything else it indicates to MoI that you want to trim each of these objects with the other. Under other more typical uses of Trim you would at this point select an additional object to cut the selected ones with.
Then the next stage of Trim shows a prompt that says "Select pieces to remove or push Done to keep all" - push Done here again to indicate you want to keep all the pieces instead of removing any sections.
At the end of all that, your 2 longer curves are now split up into 4 halves. This now makes a type of arrangement that can work with Network surface. Imagine those 4 halves touching each other at a kind of "pole" area. With this arrangement you could imagine that those curves could be arranged flattened out similar to a map of the world, with those "pole" areas corresponding to the North and South poles on an actual map of the real world. Without the curves trimmed up, MoI was not able to figure out how to arrange the curves into a 2D type layout like a flattened map, Network surface needs this kind of layout to work.
To do the network is really easy - just select all 5 curves (those 4 "half" curves created by Trim, and also your middle ellipse piece) and run Construct / Network, and that makes the surface that I posted.
Hope this helps explain it!
- Michael
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