title: Tricontour with triangle values
body: <p>I would like to produce a tricontour plot <a href="http://matplotlib.org/examples/pylab_examples/tricontour_demo.html" rel="nofollow">similar to these</a> with matplotlib. The difference between these examples and my situation is that I don't have the values of my function in the grid points: they are defined in my triangles (e.g. in the centroid of each triangle).</p>
  
  <p>I would like to plot the result of a finite volume simulation, where the values are defined for each control volume, not for each grid point.</p>
  
  <p>I suppose one simple solution would be to average the values at each grid point. I would like to know if there are any more direct solutions.</p>