[egebat7]

Hi,



I am facing a small issue when I plot my 2D data over a line. I used this function to create my VTK format surface data:

    zSlice1
    {
        type    surfaces;
        libs ( "libsampling.so" );
        writeControl    runTime;
        writeInterval   0.01;
        format          binary;
        fields          ( U T p_vapor k epsilon nut alphat rhok );
        interpolationScheme cellPoint;
        surfaceFormat   vtk;
        
        surfaces
        (
            zC1
            {
                type    cuttingPlane;
                planeType   pointAndNormal;
                pointAndNormalDict
                {
                    point   ( 0 0 0 );
                    normal  ( 0 0 1 );
                }
                interpolate true;
            }
        );
    }

When I try to visualize this surface it looks well. However, when I try to plot over a line using "PlotOverLine" feature in Paraview, some values don't appear (the line is discontinues in some parts) and give NaN.

Is this a bug or a numerical situation where some data is not exactly at z = 0 plane? You can see how the plot looks like from the attachment. For every field (T, U, p ...), same locations are missing. However, missing locations change when I plot a different line, but always with holes in it.


Best regards,
Ege


Edit: The missing points are not related with the local mesh density, since it is a very uniform mesh and contains only block cells.

[egebat7]

Okay I solved the issue by changing my cutting plane z-axis point from 0 to 0.001:

            zC1
            {
                type    cuttingPlane;
                planeType   pointAndNormal;
                pointAndNormalDict
                {
                    point   ( 0 0 0.001 );
                    normal  ( 0 0 1 );
                }
                interpolate true;
            }

I am working with hexahedral cells and the plane passing through z = 0 is always intersects with the cell edges. Maybe because of this, sampling function was not working properly. I am still not sure but this could be the issue.