# Curve and surface analysis

Hallo,

is it possible using the Curve and surface analysis module to fit a curve or surface to point data but to define a constrain in the adjustment, i.e., fix one or more parameters of the target curve or surface function?

To be specific, I am trying to fit a sphere of known radius to 3D point data. Therefore, the radius of the sphere would not be an unknown parameter in the adjustment, only coordinates of the sphere center.

If it is possible, in what way can it be defined in JUniForm module?

I would very much appreciate if you took the time to read and answer my question.

Thank you,
Antonio