[Paraview] Bug for vti in Paraview 4.3

[Cory Quammen]

Hi Gabe,

Thank you for providing  the sample data set. I see the same problem with
the clipping filter you report. In fact, I believe this bug in the bug
tracker is related [1]. To work around this, you could run the Extract
Surface filter and clip by scalars.

As for the problem you report with opacity mapping on surfaces, I do see
problems with the Slice representation on the original data while setting
opacity below the 0 data value to 0 and the opacity above 0 to 1. If I
change the representation to Surface, the opacity mapping seems to work as
expected.

I hope that helps,
Cory

[1] http://www.vtk.org/Bug/view.php?id=13712

On Fri, Jun 19, 2015 at 5:31 AM, Gabe Weymouth <G.D.Weymouth at soton.ac.uk>
wrote:

> Ok, I've put a sample up on dropbox. Note that this uses the
> "format=append" - I'm not sure if the binary data will be readable if
> you're using a different system.
>
> ​
>    sample.vti <https://www.dropbox.com/s/9ht9zr9njulpstn/sample.vti?dl=0>
> ​
>
>
> On Jun 18, 2015 11:10 PM, "Berk Geveci" <berk.geveci at kitware.com> wrote:
>
>> Can you share the dataset with us?
>>
>> Best,
>> -berk
>>
>> On Thu, Jun 18, 2015 at 7:43 AM, Gabe Weymouth <G.D.Weymouth at soton.ac.uk
>> <mailto:G.D.Weymouth at soton.ac.uk>> wrote:
>> I downloaded the newest stable build of paraview yesterday (upgrading
>> from 4.1) so I could utilize the new features in pvpython (Screenshot,
>> etc). Unfortunately, I ran into what appears to be a bug in the handling of
>> clipping/opacity for vti files.
>>
>> I have a 2D field that ranges from -20 to 110 and I need to isolate the
>> negative regions and discard the positive regions. I do this by clipping
>> (type: scalar, value: 0, inside out). In the new version, this clips the
>> entire field - nothing remains.
>>
>> An alternative method that smooths out the transition is to map the
>> scalar from -2 to 2, setting zero opacity at 2. In the new version of
>> paraview, this blanks out both the positive and negative values, leaving
>> only the region between -2 to 2. A color map without opacity works as
>> expected, and the legend shows the correct opacity behaviour.
>>
>> Playing around with the range of the transfer function, the negative
>> values begin to blank out when the positive limit is set below 20. This
>> would seem to indicate a bug in the application of the transfer function to
>> the image grid surface render.
>>
>> If I repeat the tests using a vtr file and identical data, both clipping
>> and opacity work as expected. I see the same results on my mac and linux
>> workstation.
>>
>>
>> Gabriel D Weymouth
>> Southampton Marine and Maritime Institute Lecturer
>> University of Southampton
>> Boldrewood Campus, Building 176, Room 3029
>> Southampton, SO16 7QF, UK
>>
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> _______________________________________________
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>
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>
> Please keep messages on-topic and check the ParaView Wiki at:
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>
> Search the list archives at: http://markmail.org/search/?q=ParaView
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-- 
Cory Quammen
R&D Engineer
Kitware, Inc.
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