Hi,

I think it has to do with those two points at y=0. If you change the second
one two 0.1 it is possible to set Value to zero and it renders okay.
The docs say: "The difference is that the SOR object is less flexible
because it underlies the restrictions of any mathematical function, i.e. to
any given point y on the rotation axis belongs at most one function value,
i.e. one radius value." But you define to values for y=0 (-1 and -0.5).

Marc-Hendrik

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