[Paraview] 3d contour interpolation problem

[markus]

Dear all,

i currently experience a 3d contour issue in paraview. If i try to
visualise my scalar data on a cylindrical R,Z,\varphi grid by contours,
the interpolation of the contours prefers the \varphi direction even if
the real data or contour prefers the direction along another vectorfield.

You can find an exemplary picture at
https://github.com/feltor-dev/feltor. Here, the bubbles along \varphi
are not interpolated correctly.

Is there any workaround to do it correctly?

best regards
markus held