<div dir="ltr">Dear Simon, <br><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Jul 17, 2015 at 4:43 AM, Simon ESNEAULT <span dir="ltr"><<a href="mailto:simon.esneault@gmail.com" target="_blank">simon.esneault@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr">Hi All,<br><br>We're experiencing GPU volume rendering failure on a lot (maybe all ?) Intel HD windows system with up to date drivers.<div><br>This is reproducible in Paraview or with the GPURenderDemo example from VTK, just load a volume and try to render the volume... Here is a result image from paraview on a Dell Latitude E7450 (Intel HD 5500 inside), with GPU rendering [1] and the same volume with CPU VR rendering [2].<br>Interestingly, the volume rendering used to work with drivers older or equal to the version 10.18.10.3496 [3]. As a work around, we ask our customers to downgrade their driver version to this one, and they're enjoying smooth GPU rendering. But this driver is quite old and does not support recent chipset...<br><br>I've built and tested the GPURenderDemo with the brand new OpenGL2 backend on an affected machine and of course it does work out of the box (congratulations for this amazing work !). </div></div></blockquote><div>Great! </div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div>But our application is FDA/CE marked and we need to wait that this new backend is completely ready for prime time. So for now, we have to stick with VTK 6.1 ...<br></div></div></blockquote><div><br></div><div>Most of the tests are passing for OpenGL2 (<a href="https://open.cdash.org/index.php?project=VTK">https://open.cdash.org/index.php?project=VTK</a>) on most of the dashboards (various configurations etc) but it is a moving target just like VTK itself is a moving target. I guess you are waiting for a VTK release that defaults to OpenGL2 as oppose to OpenGL? </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div><br>Anyone has any clue ? They're some warning that pop up from paraview related to the extension "gl_version_1_2" that could not be loaded, not sure if that could be related ? Following this thread [4] and the fix proposed, I've tried to replace</div><div>/*****************/<br></div><div>extensions->LoadExtension("GL_VERSION_1_2")</div><div>/*****************/<br></div><div>by</div><div>/*****************/<br></div><div>extensions->LoadExtension("GL_EXT_texture3D");<br>extensions->LoadExtension( "GL_ARB_texture_non_power_of_two" );</div><div>/*****************/</div><div>in the vtkOpenGLGPUVolumeRayCastMapper.cxx, The warning disappears but there is still no volume rendering (tested with GPURenderDemo). Maybe it needs some others extensions ?</div></div></blockquote><div><br></div><div>Yes, there is a patch and I can send it to you. I have to talk to folks here if we can fix the old mapper with those changes but as of now it is not in the plan. </div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div><br>Should I fill a bug in paraview, vtk ? Are there any plan to maintain and maybe fix this for the old backend ?<br></div></div></blockquote><div><br></div><div>- Aashish</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div><br>Thanks,<span class=""><font color="#888888"><br>-- <br><div><div dir="ltr">------------------------------------------------------------------<br>Simon Esneault<div>Rennes, France<br>------------------------------------------------------------------</div></div></div><br>[1] <a href="http://picpaste.com/pics/Paraview-4-3-1-GPU-VR_fail.1437122217.PNG" target="_blank">http://picpaste.com/pics/Paraview-4-3-1-GPU-VR_fail.1437122217.PNG</a></font></span></div><span class=""><font color="#888888"><div>[2] <a href="http://picpaste.com/pics/Paraview-4-3-1-CPU-VR_win.1437122267.PNG" target="_blank">http://picpaste.com/pics/Paraview-4-3-1-CPU-VR_win.1437122267.PNG</a></div><div>[3] <a href="https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=23339" target="_blank">https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=23339</a><br>[4] <a href="http://public.kitware.com/pipermail/vtkusers/2014-April/083584.html" target="_blank">http://public.kitware.com/pipermail/vtkusers/2014-April/083584.html</a></div></font></span></div>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><font face="trebuchet ms, sans-serif"><i>| Aashish Chaudhary <br>| Technical Leader <br>| Kitware Inc. <br></i></font><div><i><font face="trebuchet ms, sans-serif">| </font><a href="http://www.kitware.com/company/team/chaudhary.html" target="_blank">http://www.kitware.com/company/team/chaudhary.html</a></i></div></div></div>
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