[Paraview] Question about probe point data

[曹智选]

 Hello,
Even though I am able to obtain some data by first generating grid using
"Delaunay3D" and then adding "Probe Location". But the problem is that
these data that I obtained are questionable.
For example,
The coordinates of probe points is:
-64 0 15 while the coordinate  property (paraview treats all data including
property data like velocity, density and coordinate as field data)
interpolated based on probe location and grids that was generated is:
119 0 945
They are obviously different. I am not sue whether the "probed" value are
values at the probe location computed by interpolation or not?  It seems
that the interpolation is did in a incorrect way and gives me some
questionable data.

Is it possible that I can add probe locations without grids (the probe
would be interpolation purely based on point data) and define my own way of
interpolation, For example I can define kernel based collocation type of
interpolation. Do you think this is possible (feasible) in paraview?


2016-02-12 12:58 GMT-05:00 曹智选 <hitcaozx at gmail.com>:

> Thank you for your help.
> 1) As you said, it is not necessary to use "Resample With Dataset" filter.
> Just "Probe Location" is enough.
> 2) I figured out why I got all zeros: because the input data I am using is
> in .h5part format and they are just points data., no surface, no grid, no
> volume.
> 3) The way to overcome this issue is use Delaunay3D to generate grid. Then
> use "Probe Location".
> Hope this will help someone who also has similar problems.
>
>
> 2016-02-12 12:40 GMT-05:00 Moreland, Kenneth <kmorel at sandia.gov>:
>
>> The "Probe Location" and the "Resample With Dataset" filters actually use
>> the same code underneath the covers. The only difference is how the
>> geometry source is inputted (internally generated points for "Probe
>> Location" and another dataset for "Resample With Dataset"). Also "Probe
>> Location" is marked to by default show the results in a table view.
>> However, you can show the results of "Probe Location" in a 3D view as well.
>> Just select the 3D view and turn on its visibility.
>>
>> Anyway, the point of all that is that it should be unnecessary for you to
>> run the "Resample With Dataset" filter. You should get the same data from
>> the output of the "Probe Locations" filter.
>>
>> If all the field data in the output from "Probe Locations" are zero, then
>> there is some reason why the filter could not find field data at the
>> selected points. Once common problem is that the points are not actually
>> located within the volume of your data. If your input data is actually a
>> surface, then this is likely as it is hard to place points exactly on the
>> surface. Another cause for problems that recently came up on the mailing
>> list is issues with using an unstructured grid dataset that has voxel-type
>> cells in it. The thread is captured here:
>> http://markmail.org/message/t5vbs7opn43wtkdw.
>>
>> -Ken
>>
>> From: ParaView <paraview-bounces at paraview.org> on behalf of 曹智选 <
>> hitcaozx at gmail.com>
>> Date: Thursday, February 11, 2016 at 2:09 PM
>> To: "paraview at paraview.org" <paraview at paraview.org>
>> Subject: [EXTERNAL] [Paraview] Question about probe point data
>>
>> Hello,
>> I am trying to probe point based data with Paraview.
>> What I did is:
>> 1) Create probe points with "ProbeLocations"
>> 2) Then use "Resample With Dataset", choose input as the data that I have
>> already had and source as "ProbeLocations" that I created in the previous
>> step.
>>
>> The trouble that i have is:  All field data including coordinates are all
>> zero.
>>
>> Could someone help me out?
>>
>> Thank you very much!
>>
>> Orman
>>
>
>
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