On Tue, Jul 12, 2011 at 12:16:59PM +0000, Juha Jäykkä wrote:
> > The atomic_orbital example does an isosurface on the data. Doing an
> > isosurface on a flat dataset is an ill-defined operation. You probably
> > want to be doing something different than an isosurface. What's your end

> That does not really address the problem with set_active_attribute().

I don't know: you gave only a fairly non-specific description of your
problem. I would have to write an example to find out where things
exactly fail.

> > goal? Why are you doing this isosurface?

> I want to find points where two contours intersect: where real and
> imaginary parts of my Phi both = 0. To simply look for |Phi|=0 is not
> useful since it would require extrapolation (I am not guaranteed to
> have a point |Phi|=0 in my data, in fact, I am almost guaranteed NOT to
> have such a point). So, I turn extrapolation problem into an
> iterpolation problem by first taking one contour of the first array,
> changing the active attribute and taking another contour. Since now the
> first contour has filtered out all points NOT on the first contour, the
> second contour gives me the intersections of the two.

It seems convoluted to me: you are using a visualization package as a
numerical computing tool. Not to say that VTK does not do numerical
computing well, but you are fighting it.

I would try representing data as a surface (PolyData, which you can
create using an mlab.mesh command) and applying to it a 2D contouring
operation (I do not know out of the top of my head what the name of the
corresponding VTK filter is, but I am pretty sure that it exists.

HTH,

Gael

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