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create symmetric surface from STL

create symmetric surface from STL

(OP)
Hello, I am struggling with the problem of getting a perfectly symmetric surface from scanned STL. I am on NX 11.

My problem is that I have to make a new press-form data from an old plywood mold. As far as it is plywood, the shape and scanned data are twisted by nature.

After I scan the object, I use the FitSurface command to generate the initial surface that is pretty close with tiny deviations.

Afterwards, it is necessary to convert this one into perfect symmetry by manipulation and approximation.

I can use X-form to be able to manipulate the surface but there is no way to constrain the poles or rows so I create the desired surface with perfect symmetry.

Can you give me some advice on how to proceed further in order to achieve the desired results?

Or do you have other option that will bring me to desired results?

I am attaching some screenshots to illustrate my issue.

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