<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:12pt"><div>Hi,</div><div><br></div><div>I've been developer a vortex core tracer, which is basically a customized version of vtkStreamTracer. I use the interpolation code quite heavily in the class, in this test case I use the point interpolator (i.e. vtkInterpolatedVelocityField class).</div><div><br></div><div>Now in one part of the code, I've noticed that doing two calls to the interpolator's FunctionValues for a bad boundary point produces strange results. After the first call to FunctionValues I obtain a valid cell (using GetCell) and after the second call I get a NULL cell. The second call is correct because the point in question's y coordinate is -0.0012773338068285955, which outside of the data set's 0-boundary.</div><div><br></div><div>Anyway, I will look into this further to see what's up; I was wondering if anybody
has ideas.</div><div><br></div><div>Thank you,</div><div>Sohail Shafii</div></div></body></html>