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Displays like the CAVE can be formed in various configurations. In ParaView these configurations can be specified using the PVX configuration XML file.
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==Where to specify this?==
* pvx file can be specified as the last command line argument for any of the server processes.
* Typically the pvx file is specified for all the executables whose environment is being changed using the pvx file. In case of data-server/render-server configuration, if you are setting up the environment for the two processes groups, then the pvx file must be passed as a command line option to both the executables: pvdataserver and pvrenderserver.
* When running in parallel the file is read on all nodes, hence must be present on all nodes.
 
==Structure==
 
<!-- <source lang="xml"> -->
<!-- <?xml version="1.0" ?> -->
<!-- <pvx> -->
<!--  <Process Type="server|dataserver|renderserver"> -->
<!--    <\!--  -->
<!--      The only supported Type values are "server", "dataserver" or "renderserver". -->
<!--      This controls which executable this configuration is applicable to. -->
<!--      There can be multiple <Process /> elements in the same pvx file. -->
<!--      ------------------------------------------------------ -->
<!--      |  Executable    | Applicable Process Type          | -->
<!--      |  pvserver      | server, dataserver, renderserver | -->
<!--      |  pvrenderserver | server, renderserver            | -->
<!--      |  pvdataserver  | server, dataserver              | -->
<!--      ------------------------------------------------------ -->
<!--      -\-> -->
<!--    <Machine name="hostname" -->
<!--              Environment="DISPLAY=m1:0" -->
<!--              LowerLeft="-1.0 -1.0 -1.0" -->
<!--              LowerRight="1.0 -1.0 -1.0" -->
<!--              UpperLeft="-1.0  1.0 -1.0"> -->
<!--      <\!-- -->
<!--          There can be multiple <Machine> elements in a <Process> element,  -->
<!--          each one identifying the configuration for a process.  -->
<!--          All attributes are optional. -->
<!--          name="hostname" -->
<!--          Environment: the environment for the process. -->
<!--          LowerLeft|LowerRight|UpperLeft : CAVE configuration parameters applicable -->
<!--                                          for versions 3.8 or latter only. -->
<!--        -\-> -->
<!--    </Machine> -->
<!--  </Process> -->
<!-- </pvx> -->
<!-- </source> -->
* Only 2 vectors ([LowerRight - LowerLef] and [UpperLeft - LowerLeft]) are needed, the third vector is computed from these 2.
 
== Cave Rendering ==
===Instructions===
* Turn on <code>PARAVIEW_USE_MPI</code> and <code>PARAVIEW_USE_ICE_T</code>
* run the servers using the pvx file: <code>mpiexec -np 2 pvserver cave.pvx</code>
* start and connect a client
=== Notes ===
* See below for an example of a cave configuration file
<source lang="xml">
<?xml version="1.0" ?>
<pvx>
<Process Type="client" />
<Process Type="server">
  <!-- 2 render windows will be created on the machine Erna:
      the first rendering has a camera looking forward,
      the second rendering has a camera looking backward -->
  <Machine Name="Erna"
          Environment="DISPLAY=:0"
          <!-- Camera looks forward:
                dx = 2, dy = 2, dz = -2
                Z = -2 defines the view angle  -->
          LowerLeft="-1 -1 -2"
          LowerRight="1 -1 -2"
          UpperLeft="-1  1 -2" />
  <Machine Name="Erna"
          Environment="DISPLAY=:0"
          <!-- Camera looks backward:
                dx = -2, dy = 2, dz = 2
                Z = 2 defines the distance from the camera to the view plane  -->
          LowerLeft="1 -1 2"
          LowerRight="-1 -1 2"
          UpperLeft="1  1 2" />
  </Process>
</pvx>
</source>
* See vtkCaveRenderManager::ComputeCamera for more information on how the coordinates are used to configure the cameras
* The rendering on the server is full screen by default. If you want the windows to be smaller for debugging, set the environment variable PV_ICET_WINDOW_BORDERS=1 on the client machine.

Latest revision as of 19:37, 1 February 2013

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