Creating streamlines/vectors from polydata

[ChandlerJH]

Hello,

Does anyone know a solution to creating a vector field or streamlines from vtk polydata? I've followed the node trees as shown on the BVTKnodes website, but the start of the node tree isn't available for either of them. Blender generates an output, but I cannot see the streamlines. As for the vectors, the vectors are all pointing towards +x, with orient on, and the custom code entered into the vtkAssignAttribute and vtkArrayCalculator nodes. Attached are images of my node tree setups.

Thank you

[tkeskita]

Can you please share small example data? Or at least show what does Info node tell if you attach it after Reader node?