Hello everyone! I use Paraview to visualize my compution result. And I make a contour in my Paraview.This is my result.However, I want to fit curve which is above the green line as a quartic polynomial. I am confused about how to do that. I also want to know if I can extract the point coordinate on this curve so that I can fit this curve using python or matlab. thanks a lot!

I think you should do that in two steps:

- cut your data to keep only the part of interest, with the
`Clip`

filter. - use a
`Programmable Filter`

to manipulate the actual data (so coordinates).

See programmable filter documentation: 5. Programmable Filter — ParaView Documentation 5.11.0 documentation

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Thanks a lot! I have made it!