[Paraview] confused with getting nan values in plot over line

[Ali Rostai]

Hi and excuse me for late reply,

I tried the "Clean to grid" filter and it seems that problems has been
solved. But I noticed that
the data was coming from a finite element method using P1-discontinuous
Triangular elements.
And it looks for me the problem is somehow related to that.

But as a general question Can paraview show P1-discontinuous data? then for
each node in mesh
we have several values. But I think vtk format accepts only one value for
each noed.

Regards,
Ali


On Thu, Oct 6, 2011 at 10:34 AM, Moreland, Kenneth <kmorel at sandia.gov>wrote:

>  For starters, the going to infinity thing in the plot is weird. There
> should just be gaps in the curve. You may have hit a bug.
>
> As far as why you are getting nans in the first place I'm not sure. I can't
> really tell from your screenshots, but it looks your geometry might be a
> bunch of polygons on a plane. Is that the case? If so, make sure that all z
> coordinates are zero. If all the coordinates in pone dimension are exactly
> the same, then I would expect it to work. Otherwise the line will not be
> completely on it.
>
> If that is not the case, another problem could be with your topology. The
> find cell method could fail if your mesh is not fully connected. For
> example, if you have repeated coincident points, then VTK won't be able to
> find neighbors and trace to a cell. Try running one of the clean filter on
> the data. I think that should fix the problem. I think there are some corner
> cases where even that might not work, but your mesh looks like it has good
> quality triangles or tetrahedra, so that seems unlikely unless you have
> degenerate cells or gaps I cannot see.
>
> -Ken
>
>
>  *From*: ali rostai [mailto:ali.rostai at gmail.com]
> *Sent*: Thursday, October 06, 2011 08:12 AM
> *To*: Moreland, Kenneth; paraview at paraview.org <paraview at paraview.org>
> *Subject*: Re: [Paraview] confused with getting nan values in plot over
> line
>
>  Hi,
>
> I tried and tried to move the start and end of line inside the domain.
> Actually I see two lines going to infinity (nan) in xyplot pane now!
> (screen shot attached)
>
> Regards,
> Ali
>
> On Thu, Oct 6, 2011 at 5:08 AM, Moreland, Kenneth <kmorel at sandia.gov>wrote:
>
>> Like I said previously, it looks like the line you define is right on the
>> boarder of your volume. Try moving the line slightly more inside the volume.
>>
>> -Ken
>>
>
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