connect points_001.gh (35.5 KB)
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thank you so much @HS_Kim!
Some of the curves along the edges are overlapped which causes problems connecting them.
connect points_2020Nov25a.gh (44.1 KB)
Hi @HS_Kim and @Joseph_Oster , is it possible to create a surface and extrude those line we connected? can you please help me. please refer to image. thanks
You are running into all sorts of challenges 
The grid you provided isn’t nicely aligned.
Generally it would be better to start with a surface, divide it and create a clean network of lines.
The beams can be done in many ways. I trimmed the lines and used two planes per beam, resulting in a straight but twisted beam for those that are at an angle. You might want a curved beam without twist.
The solution is dependent on a lot of decisions. Maybe you want as many beams as possible to be equal, or all possible nodes equal?
20_11_26_triangular_grid_beam_connector.gh (53.1 KB)
PS: a title should be short, for example “Problem with triangular grid and connectors”
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Thank you very much @martinsiegrist for the solution you made. Yes you are right. Actually i want all my nodes to be equal as possible. But sometimes. The geometry creates some clashing. Then i starting adjusting some nodes into bigger one.
Here’s another approach which would work nicely with sheet metal connectors.
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