[Paraview-developers] LightViz - image resolution and WebGl

[Sebastien Jourdain]

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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