[Paraview] Bug for vti in Paraview 4.3

[Berk Geveci]

Hi folks,

To close the loop on this, these bugs have been fixes. Thanks TJ Corona.

-berk

On Thu, Aug 13, 2015 at 12:20 AM, Gabe Weymouth <G.D.Weymouth at soton.ac.uk>
wrote:

> Great. Thanks for letting me know.
>
> *Gabriel D Weymouth*
> Southampton Marine and Maritime Institute Lecturer
> University of Southampton
> Boldrewood Campus, Building 176, Room 3029
> Southampton, SO16 7QF, UK
>
> On Thu, Aug 13, 2015 at 5:25 AM, Berk Geveci <berk.geveci at kitware.com>
> wrote:
>
>> I have a fix for the clip issue in the works - clip has not worked with
>> 2D image data in quite a while. There is another bug where clip crashes
>> unless the 2D image is on the x-y plane. We will work on a fix for that
>> also.
>>
>> 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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