[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.

best regards
markus held