title: Probing/sampling/interpolating VTK data using python TVTK or MayaVi
body: <p>I would like to visualise a VTK data file (OpenFOAM output) using python. The plot I would like to make is a 1-d line plot of a quantity between two endpoints. To do so, the unstructured data should be interpolated on the points which lie between the two endpoints.</p>
  
  <p>I've used the package Mayavi to visualise the VTK data. At the <a href="http://docs.enthought.com/mayavi/mayavi/auto/example_probe_filter.html" rel="noreferrer">mayavi webpage</a> there is a description of probing a single value from a scalarfield. This function does not work on a VTK file.</p>
  
  <p>Also I've found a delaunay3d method (mlab.pipeline.delaunay3d) at the <a href="http://docs.enthought.com/mayavi/mayavi/data.html" rel="noreferrer">mayavi webpage</a>. I did not get this one to work either.</p>
  
  <p>Could anyone advise me how to interpolate my data?</p>