Shading problem when converting Multipipe SubD to Nurbs

I made a multi-pipe object with grasshopper and baked it into rhino.
After converting the just created subD to nurbs with G1x, the vertices with multiple edges ending on it are shading weird. See pictures below:
Whats the best way to clean them up and make all the surfaces G2? Is that even possible?
I cant share the file because its for my bachelors work.
Thank you for your help :slight_smile:


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can you share a piece of your file that shows the problem, but not the whole file? Subd if you still have it…I think this is a topology issue around the singularity…

you may want to try topology like this instead of the singularity you have currently

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