[Paraview] Comparing results computed with 2 different meshes

[Evan Kao]

Hi Cory,

Thanks for the suggestion.  Resample With Dataset solves the problem of
matching up the Point IDs, but only passes data from the Input (which I
guess makes sense given its purpose), so I think regardless of what I
rename the arrays, the data will always be from only one of the meshes
meaning I can't use Calculator to compare the data.

I think my main obstacle is the data type.  Paraview reads in Ensight data
as a Multi-Block data set, but neither Append Datasets nor the Python
Calculator seem to work on that data type.  Is there a simple way to
convert them into a format that can be read by those filters?

Thanks,
Evan


On Thu, Jan 30, 2014 at 6:10 AM, Cory Quammen <cory.quammen at kitware.com>wrote:

> Evan,
>
> You might want to take a look at the Resample With Dataset filter. One
> of your meshes would be the Input and one would be the Source. What
> this filter will do is sample the data values in the Input mesh at the
> locations of points in the Source. If I understand the setup of your
> meshes, this should essentially take care of the problem where your
> point IDs are not the same. The result will be a single mesh with two
> data arrays that you can then compare point by point.
>
> You might run into a problem if both meshes use the same name for the
> point array from which you want to get values (one will clobber the
> other). You can take care of that by using the Calculator to rename
> one of the mesh's arrays, then using the result of the calculator as
> the Input or Source.
>
> Hope that helps,
> Cory
>
> On Mon, Jan 27, 2014 at 4:18 PM, Evan Kao <tossin at gmail.com> wrote:
> > Hello all,
> >
> > I'm trying to compare the results of 2 CFD simulations (which are
> imported
> > into Paraview as Ensight data) point-by-point but I'm having trouble
> > figuring out how to even combine the data into a single Pipeline object
> so
> > that I can do some simple calculations with the Calculator Filter.  I'd
> > appreciate it if anyone could let me know if what I'm trying to do is
> > natively possible in Paraview, and if not, provide some suggestions on
> how
> > to approach it.
> >
> > What might complicate the process is that the results were obtained using
> > two different meshes (in fact, it's a mesh comparison test).  The points
> I
> > want to look at are the same for both meshes, but the point IDs are
> > different.
> >
> > So what I'd like to do in summary is:
> > 1) Is there a way to extract and sort the data in a way such that the
> point
> > IDs are the same for both meshes?
> >
> > 2) Is there a way to convert/manipulate the data into a single Pipeline
> > object for comparison?  Or to compare the results of different Pipeline
> > objects?  I've tried various combinations of filters like AppendDatasets,
> > GroupDatasets, and MergeBlocks with little success.
> >
> > Thanks,
> > Evan
> >
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