thanks jacob, works great except missing short line(s), i changed one short line from 1’ 6” to 2 3/4” in line.rvt file, i looked at your code, seems not tolerance issue
Was that on the Python method? All curves were maintained in my testing of that node… 
try to make one of your original lines very short, in my case 2 3/4”, total curves should be 7 instead of 6
So this differs from the file you posted above? and using the Python solution?
Ah - the sort is killing you at a certain point. I’ll try to build another method for you.
If you return the connected polycuve instead of the sorting (see the comments in the code) you’ll get a single chain with that line included even if you make it 1/32" (the smallest dimension reasonable in 3D geometry - 0.0026 feet).
@ning.zhouHNQLJ I updated the python above to deal with minimally long curves (1/32" tested").
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thanks jacob, works great!
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