[Paraview-developers] LightViz - image resolution and WebGl

[Albrecht Kyrieleis]

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/visualizer/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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