[Paraview] Volume rendering & pvserver

[Utkarsh Ayachit]

Volume rendering of image datasets is currently not supported in CAVE
(aka CurvedScreen) configurations. One hacky way to deal with it is to
convert the data to unstructured grid (using Tetrahedralize filter)
and then volume render that.


On Wed, Nov 21, 2012 at 8:18 AM, Johannes Zarl <johannes.zarl at jku.at> wrote:
> Hi,
>
> It seems like there is a bug with rendering volume datasets when being
> connected to a pvserver process.
>
> When I use the builtin: server and load the dataset into paraview, everything
> is rendered correctly. However, when I connect to a server process, only parts
> of the volume data are shown. Objects using surface representation are always
> rendered correctly.
>
> Just now I realised that there is a pattern to display irregularities: the
> bounderies of the rendered parts align with the data-segmentation between the
> process ids.
>
> So I guess there is some kind of communication problem between the pvserver
> processes? If so, how can I find out the cause of this?
>
> Any help appreciated,
>   Johannes
>
>
> P.S.:
> The example data I use is the headsq.vti file from the ParaViewTutorialData
> dataset. I currently use ParaView/master 3.14.1-2441-g46cfc4c, and have tested
> this also with paraview 3.14.1 (compiled from source).
>
> The server is started as follows:
> mpirun -np 3 \
>   --host n001 --host n002 --host n003 \
>   --mca btl openib,sm,self \
>    -x LD_LIBRARY_PATH -x PATH -x DISPLAY=:0 \
>    pvserver /home/edvz/zing/scratch/vcva/curvedscreen.pvx
>
> The curvedscreen.pvx file is this one:
> <?xml version="1.0" ?>
> <pvx>
>  <Process Type="client" />
>   <Process Type="server">
>   <EyeSeparation Value="0.065"/>
>     <!-- CurvedScreen 3 screens -->
>    <Machine Name="n001"
>             Environment="DISPLAY=:0"
>             LowerLeft= "-4.701 0.0   -2.641"
>             LowerRight="-1.201 0.0   -2.641"
>             UpperRight="-1.201 1.750 -2.641" />
>    <Machine Name="n002"
>             Environment="DISPLAY=:0"
>             LowerLeft= "-1.750 0.0   -2.641"
>             LowerRight= "1.750 0.0   -2.641"
>             UpperRight= "1.750 1.750 -2.641" />
>    <Machine Name="n003"
>             Environment="DISPLAY=:0"
>             LowerLeft=  "1.202 0.0   -2.641"
>             LowerRight= "4.752 0.0   -2.641"
>             UpperRight= "4.752 1.750 -2.641" />
>  </Process>
> </pvx>
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