[Paraview] difference of two data sets

[Xunlei Wu]

Hi Berk,
I was playing with programmable filter feature. Do you have any
tutorial/examples that I can follow? My initial test would be on two
structured mesh with the same geometry but different size. So I can skip
the delaunay filter. After I am done with the resample filter, how can I
compute the difference of two scalar fields from two data sets?

On another novice ParaView user issue, I would like to plot the vector
field or arrow glyphs from the structured grid data where I stored say
velocity info. as 3 individual fields vx, vy, vz in HDF5 and XDMF. I
tried Glyph filter. But I don't know how to use it (arrow) to represent
vx, vy, vz.

Thanks a lot for your help.

Best,
x

On 4/2/2010 1:23 PM, Berk Geveci wrote:
> The best way that I can think of doing this is to map the particle
> data onto the structured mesh and then use the programmable filter to
> compute the difference on the mesh. Have you thought about how that
> would be done? You can use the delaunay filter to first create an
> unstructured mesh from the particle data and then use the resample
> filter to map that onto the structured mesh. That would obviously make
> certain assumptions about how the field represented by the particles
> is interpolated. The alternative is to use the closest point. What do
> you think?
>
> 2010/4/2 Xunlei Wu <xunlei at renci.org>:
>   
>> Hi Berk,
>> Ideally, I would like to have pvserver in the back to handle large scale
>> data sets. But for now, speed is not an issue. And I know how to do
>> multiview to show two data sets side-by-side with linked camera. I
>> currently do not have the difference between data sets pre-computed, and
>> would like to use some ParaView features to handle that.
>> Thanks for your help.
>>
>> Best,
>> x
>>
>> On 4/2/2010 10:56 AM, Berk Geveci wrote:
>>     
>>> Xunlei,
>>>
>>> Are you trying to do this in parallel?
>>>
>>> -berk
>>>
>>> On Fri, Apr 2, 2010 at 10:36 AM, Xunlei Wu <xunlei at renci.org> wrote:
>>>
>>>       
>>>> Hi All,
>>>> I want to visualize the difference between two data sets and plot the
>>>> error on one data set as the reference. Currently, I have 2 structured
>>>> grid data sets of the same gemoetry; and 2 unstructured point cloud data
>>>> sets.
>>>> Are there any filters in ParaView for this purpose? Thanks a lot.
>>>>
>>>> Best,
>>>> xunlei
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