[Paraview-developers] LightViz - image resolution and WebGl

[Sebastien Jourdain]

When you run "ps aux | grep pvpython" do you see that argument properly
passed?

This is where that argument should be used
https://github.com/Kitware/light-viz/blob/master/server/pvw-light-viz.py#L183

Is the resolution you are trying to use bigger than the default below?
https://github.com/Kitware/light-viz/blob/master/server/pvw-light-viz.py#L160-L161



On Thu, Apr 12, 2018 at 11:45 AM, Albrecht Kyrieleis <akyrieleis at gmail.com>
wrote:

> Thank you, Seb
>
> I've installed the server on Linux, but view the data in using Chrome
> browser under Windows7. In light-viz-cli.js I modified :
>
>         const cmdLine = [
>             quotePath(pvPythonExecs[0]),
>             '-dr',
>             '--force-offscreen-rendering',
>             quotePath(path.normalize(path.join(__dirname,
> '../server/pvw-light-viz.py'))),
>             '--content', quotePath(path.normalize(path.join(__dirname,
> '../dist'))),
>             '--port', program.port,
>             '--viewport-scale', 2,
>         ];
>
> but this dose not seem to have an effect when restarting the server.
>
> Thank you
>
> Albrecht
>
> On 12 April 2018 at 18:08, Sebastien Jourdain <sebastien.jourdain at kitware.
> com> wrote:
>
>> Hi Albrecht,
>>
>> I'm glad you managed to use LightViz with a local installation. Maybe the
>> best place to talk about LightViz would be the Issue tracker on Github, but
>> here is fine too (although the paraview-user mailing list might be better
>> for the mailing side).
>>
>> q1) I believe you are on Mac with a retina display. The issue is related
>> to the reported size between the browser and what VTK/ParaView render. To
>> solve it, you can provide additional argument when running light-viz to
>> double the resolution. For that just add "--viewport-scale 2" in the
>> generated command line as the JS cli does not have that arg built-in. (I
>> guess I forgot to add it like in visualizer
>> https://github.com/Kitware/visualizer/blob/master/bin/pvw-
>> visualizer-cli.js#L40 and https://github.com/Kitware/vis
>> ualizer/blob/master/bin/pvw-visualizer-cli.js#L125-L136)
>>
>> q2) No but Visualizer give you the option to either do "remote rendering"
>> or "local rendering" (webgl). It would be possible to extend LightViz to
>> switch its renderer like Visualizer is doing.
>>
>> q3) Are you thinking frustrum selection or just surface? In either case,
>> you will need to create a new module. The capability exist within ParaView
>> but you will have to wire them between the Web UI and the processing that
>> needs to happen on the server side. And if you are not familiar with
>> ParaView, that might be a daunting task. But we can help...
>>
>> Thanks for reaching out,
>>
>> Seb
>>
>> On Thu, Apr 12, 2018 at 10:28 AM, Albrecht Kyrieleis <
>> akyrieleis at gmail.com> wrote:
>>
>>> Hi,
>>> I have installed LightViz and want to modify it to fit exactly our
>>> needs. Not sure whether this mailing-list is the right one.
>>>
>>> I have installed LightViz and Paraview-5.5(Linux CentOS) and can import
>>> a vtk data file using the --add-dataset option. Visualization and function
>>> of LightViz is great. But I have three  questions:
>>>
>>> - the dataset looks a  bit blurry and the orientation arrows are always
>>> quite blurry. How can I fix this ?
>>> - Is LightViz actuallly using WebGl ? If not, how can I modify it to use
>>> WebGl  and can one hope to get improved performance compared to the
>>> standard installation ?
>>> - I would like to add a new feature that allows marking with the mouse
>>> an area on the dataset and will return the average/Min/Max value of the
>>> data points enclosed. Is there some module already existing which I can
>>> bring in for this task ?
>>>
>>>
>>> Thank you very much
>>>
>>> Albrecht
>>>
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>>
>
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