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