[Paraview] Bug for vti in Paraview 4.3

[Cory Quammen]

Gabe,

I filed a bug report about the opacity problem

http://www.vtk.org/Bug/view.php?id=15563

Thanks,
Cory

On Fri, Jul 3, 2015 at 11:24 AM, Cory Quammen <cory.quammen at kitware.com>
wrote:

> 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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>> _______________________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at
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>>
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>> http://paraview.org/Wiki/ParaView
>>
>> Search the list archives at: http://markmail.org/search/?q=ParaView
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>
>
> --
> Cory Quammen
> R&D Engineer
> Kitware, Inc.
>



-- 
Cory Quammen
R&D Engineer
Kitware, Inc.
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