[vtkusers] correct way to determine vtkStreamTracer ReasonForTermination?

[tom fogal]

Hi all, I've been looking in to determining what causes my stream lines
to end when they do, and vtkStreamTracer seems to have an enum
specifically for this purpose -- ReasonForTermination. I am a little
concerned because it seems to be very difficult to access, and so I'm
starting to believe that I'm not accessing it in the right way.

I would expect some sort of GetReasonForTermination() function that
returns one of the valid values in the enum, but I can't seem to find
one. From looking at the code, it seems like I need to get the output's
cell data, and from that I can extract a vtkDataArray* which is really
a vtkIntArray*. Then the first element (err, tuple) of that Array will
be the ReasonForTermination.

I feel like I'm doing things the wrong way, that I am missing some
blatant interface. Has anyone used this information before? Could you
clarify or redirect me towards what I should be doing to get this data?

Thanks!

-tom