[Paraview] tile edge artifacts with volume rending in parallel mode

[Ryan Abernathey]

Excellent. This bug is frustrating because the parallel speedup I am
getting with volume rendering is huge! (Nearly linear up to ~24 processes.)
So consider my issue to also be a compliment regarding the excellent
scaling of Paraview! ;)

On Mon, Oct 26, 2015 at 12:35 PM, Aashish Chaudhary <
aashish.chaudhary at kitware.com> wrote:

> Thanks for the confirmation Ryan. This is almost my next task in the list.
> I will provide an update soon.
>
> - Aashish
>
> On Mon, Oct 26, 2015 at 12:28 PM, Ryan Abernathey <
> ryan.abernathey at gmail.com> wrote:
>
>> We just rebuilt paraview from the latest master
>> with VTK_RENDERING_BACKEND set it to OpenGL2.
>>
>> Unfortunately this did not fix the problem with volume rending in mpi
>> mode.
>>
>> Best,
>> Ryan
>>
>> On Wed, Oct 21, 2015 at 7:09 PM, Aashish Chaudhary <
>> aashish.chaudhary at kitware.com> wrote:
>>
>>> If you checkout ParaView master and then go into the advance setting,
>>> look for VTK_RENDERING_BACKEND and set it to OpenGL2 (should be a dropdown
>>> if using the CMake GUI). Make sure you do it on a fresh build directly
>>>
>>> On Wed, Oct 21, 2015 at 6:36 PM, Ryan Abernathey <
>>> ryan.abernathey at gmail.com> wrote:
>>>
>>>> Looks like you are using the OpenGL backend. Is there a possibility of
>>>>> you switching to OpenGL2 backend?
>>>>>
>>>>
>>>> I would be happy to try this. Could you link me to the relevant
>>>> documentation describing how to switch backend?
>>>>
>>>>
>>>>> - Aashish
>>>>>
>>>>> On Wed, Oct 21, 2015 at 3:37 PM, Ryan Abernathey <
>>>>> ryan.abernathey at gmail.com> wrote:
>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> I am trying to do volume rendering of this data:
>>>>>>
>>>>>> ftp://ftp.ldeo.columbia.edu/pub/rpa/paraview_netcdf/rce_rrtm303x512dx3f20_512x512x64_3km_12s_128_0000001500.nc
>>>>>>
>>>>>> It works fine when Paraview is in regular (serial) mode. But the
>>>>>> rendering is very slow. I have 32 cores in my workstation, so I tried using
>>>>>> Paraview in parallel with 16 cores. This goes MUCH faster. But
>>>>>> unfortunately, artifacts are visible related to the tiling of the data
>>>>>>
>>>>>> This image is a screenshot from the serial case:
>>>>>> [image: Inline image 6]
>>>>>>
>>>>>> And this is from the parallel case. Note the grid lines visible in
>>>>>> the bottom slice.
>>>>>> [image: Inline image 7]
>>>>>>
>>>>>> The state file to reproduce this case is available here:
>>>>>>
>>>>>> ftp://ftp.ldeo.columbia.edu/pub/rpa/paraview_netcdf/test_volume_parallel.pvsm
>>>>>>
>>>>>> Does anyone know how to fix these rendering issues in parallel mode?
>>>>>>
>>>>>> Sincere thanks,
>>>>>> Ryan Abernathey
>>>>>>
>>>>>>
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>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>>
>>>>>
>>>>>
>>>>> *| Aashish Chaudhary | Technical Leader         | Kitware Inc.
>>>>>     *
>>>>> *| http://www.kitware.com/company/team/chaudhary.html
>>>>> <http://www.kitware.com/company/team/chaudhary.html>*
>>>>>
>>>>
>>>>
>>>
>>>
>>> --
>>>
>>>
>>>
>>> *| Aashish Chaudhary | Technical Leader         | Kitware Inc.
>>>   *
>>> *| http://www.kitware.com/company/team/chaudhary.html
>>> <http://www.kitware.com/company/team/chaudhary.html>*
>>>
>>
>>
>
>
> --
>
>
>
> *| Aashish Chaudhary | Technical Leader         | Kitware Inc.            *
> *| http://www.kitware.com/company/team/chaudhary.html
> <http://www.kitware.com/company/team/chaudhary.html>*
>
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