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<p class="MsoNormal">That is basically the difference. To use any implementation of OpenGL (which is what Mesa3D is), you first need an OpenGL context. On *nix you typically get this by opening a window with the Xhost. Even when doing offscreen rendering you
need to get a context with the Xhost (because classically this was the interface to the graphics hardware).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Osmesa is a small library that sits on top of Mesa3D. It creates an OpenGL context without having to go to an Xhost. It has a different interface than GLX, so your software needs to specifically open an osmesa “window” in addition to linking
to the correct library.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">As I recall, in order to use osmesa, you need to set VTK_OPENGL_HAS_OSMESA to ON and then set OSMESA_INCLUDE_DIR and OSMESA_LIBRARY. Typically the osmesa headers and libraries are in the same location as the Mesa 3D install.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">See this Wiki page for more info: <a href="http://www.paraview.org/Wiki/ParaView_And_Mesa_3D">
http://www.paraview.org/Wiki/ParaView_And_Mesa_3D</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">-Ken<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="color:black">From: </span></b><span style="color:black">Walter Scott <wascott@sandia.gov><br>
<b>Date: </b>Monday, May 2, 2016 at 3:11 PM<br>
<b>To: </b>Kenneth Moreland <kmorel@sandia.gov>, "paraview@paraview.org" <paraview@paraview.org><br>
<b>Subject: </b>RE: [Paraview] Cron job and ParaView</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D">OK, taking small steps here, what is OSMesa, and want is Mesa? Utkarsh and I had this discussion, but I never understood the difference.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Having just googled the difference, If I understand correctly, OSMesa actually means Off Screen Mesa, and is compiled into Mesa. Otherwise, you get Mesa – software rendering, but into a GLX window?</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">You are correct – I am not building OSMesa. Thus, my problem?</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Alan</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><b>From:</b> Moreland, Kenneth <br>
<b>Sent:</b> Monday, May 02, 2016 3:01 PM<br>
<b>To:</b> Scott, W Alan <wascott@sandia.gov>; paraview@paraview.org<br>
<b>Subject:</b> Re: [Paraview] Cron job and ParaView<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Are you sure you are building with osmesa? Just using mesa is not sufficient.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">-Ken<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><b><span style="color:black">From: </span></b><span style="color:black">ParaView <<a href="mailto:paraview-bounces@paraview.org">paraview-bounces@paraview.org</a>> on behalf of Walter Scott <<a href="mailto:wascott@sandia.gov">wascott@sandia.gov</a>><br>
<b>Date: </b>Monday, May 2, 2016 at 2:58 PM<br>
<b>To: </b>"<a href="mailto:paraview@paraview.org">paraview@paraview.org</a>" <<a href="mailto:paraview@paraview.org">paraview@paraview.org</a>><br>
<b>Subject: </b>[EXTERNAL] [Paraview] Cron job and ParaView</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Times New Roman""> </span><o:p></o:p></p>
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<p class="MsoNormal">I have a user that is trying to run ParaView in a cron job, and keeps getting the following error on PV 4.4.0: 4.4.0/ParaView4/VTK/Rendering/OpenGL/vtkXOpenGLRenderWindow.cxx, line 542 vtkXOpenGLRenderWindow (0x5197850): bad X server connection<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Has anyone tried to do this, and figured out a solution? User has tried running a build I did – which attaches to Mesa – and has –use-offscreen-rendering turned on, and is running pvbatch. Same error.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Any ideas?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Alan<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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