How to convert XYZ coordinate into nodes (like Xi, Yj) on the grid curve surface?

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Hello everyone
I would like to get some help from people in this community here.
Now I have FE data as XYZ coordinates (fig1). This data is from retangular meshing of curve surface. It will be used to calculate for "central different method" as formula in fig2.
As I understand, I should to convert all nodes into Xi, Yj (fig 3). Then, I can calculate as equation above. For now, I have no idea how to convert it. I have searched the code or the related examples a lot,but I could not find.
Does anyone advise me how to solve it?
Thank you in advance
Panida

Answers (1)

Bjorn Gustavsson
Bjorn Gustavsson on 28 Nov 2022
Are you looking for something like this:
HTH
  2 Comments
Bjorn Gustavsson
Bjorn Gustavsson on 28 Nov 2022
Well if that doesnt suit you, perhaps any of the triangularization-based tools on the FEX could be used or adapted: trigradient2, trigradient or gradient-for-scattered-data.
HTH

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