<div dir="ltr"><div dir="ltr">On Thu, Mar 11, 2021 at 8:17 AM Smit Thijs <<a href="mailto:thijs.smit@hest.ethz.ch">thijs.smit@hest.ethz.ch</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p class="MsoNormal"><span lang="DE-CH">Hi Matt,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="DE-CH"><u></u> <u></u></span></p>
<p class="MsoNormal">Actually I have two 3D DMDA’s, one for the nodal data, where the FEM is solved on. The other DMDA is a cell centered one for the volume data, like the density of a particular voxel. Ideally I would like to write both point data (displacement
field) and cell data (density) to the vtr.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Code for DMDA.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"> DMBoundaryType bx = DM_BOUNDARY_NONE;<u></u><u></u></p>
<p class="MsoNormal"> DMBoundaryType by = DM_BOUNDARY_NONE;<u></u><u></u></p>
<p class="MsoNormal"> DMBoundaryType bz = DM_BOUNDARY_NONE;<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"> DMDAStencilType stype = DMDA_STENCIL_BOX;<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal" style="text-indent:10pt">PetscInt stencilwidth = 1;<u></u><u></u></p>
<p class="MsoNormal" style="text-indent:10pt"><u></u> <u></u></p>
<p class="MsoNormal"> // Create the nodal mesh<u></u><u></u></p>
<p class="MsoNormal"> <span lang="ES">ierr = DMDACreate3d(PETSC_COMM_WORLD, bx, by, bz, stype, nx, ny, nz, PETSC_DECIDE, PETSC_DECIDE, PETSC_DECIDE,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="ES"> numnodaldof, stencilwidth, 0, 0, 0, &(da_nodes));<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="ES"> CHKERRQ(ierr);<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="DE-CH"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="DE-CH"> DMSetFromOptions(da_nodes);<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="DE-CH"> DMSetUp(da_nodes);<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="DE-CH"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="DE-CH"> ierr = DMDASetUniformCoordinates(da_nodes, xmin, xmax, ymin, ymax, zmin, zmax);<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="DE-CH"> CHKERRQ(ierr);<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="DE-CH"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="DE-CH"> ierr = DMDASetElementType(da_nodes, DMDA_ELEMENT_Q1);<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="DE-CH"> </span>CHKERRQ(ierr);</p></div></div></blockquote><div><br></div><div>When I wrote the original version which output to ASCII VTK, we allowed switching between point data and cell data. It is </div><div>fragile since you have to assure that the different grids match properly. When the viewer was rewritten to use the XML,</div><div>all output was point data. It looks like it would take code changes to get this done.</div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang="EN-GB" style="overflow-wrap: break-word;"><div class="gmail-m_1580117966838244708WordSection1">
<p class="MsoNormal">Best, Thijs<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Matthew Knepley <<a href="mailto:knepley@gmail.com" target="_blank">knepley@gmail.com</a>>
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<b>Sent:</b> 11 March 2021 14:08<br>
<b>To:</b> Smit Thijs <<a href="mailto:thijs.smit@hest.ethz.ch" target="_blank">thijs.smit@hest.ethz.ch</a>><br>
<b>Cc:</b> <a href="mailto:petsc-users@mcs.anl.gov" target="_blank">petsc-users@mcs.anl.gov</a><br>
<b>Subject:</b> Re: [petsc-users] Outputting cell data in stead of point data while writing .vtr file<u></u><u></u></span></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">What kind of DM is it?<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"> Thanks,<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"> Matt<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">On Thu, Mar 11, 2021 at 3:36 AM Smit Thijs <<a href="mailto:thijs.smit@hest.ethz.ch" target="_blank">thijs.smit@hest.ethz.ch</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">Hi All,<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">I am outputting several vectors to a .vtr file successfully for viewing in Paraview. At this moment the information is written to point data. How can I change this and make sure
the data is written to cell data?<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">The code I am currently using for outputting:<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">PetscViewer viewer;<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">ierr = PetscViewerVTKOpen(PETSC_COMM_WORLD, “test.vtr”, FILE_MODE_WRITE, &viewer);<u></u><u></u></p>
<p class="MsoNormal">CHKERRQ(ierr);<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">ierr = DMView(nd, viewer);<u></u><u></u></p>
<p class="MsoNormal">CHKERRQ(ierr);<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">PetscObjectSetName((PetscObject)xPhys,"xPhys");<u></u><u></u></p>
<p class="MsoNormal">ierr = VecView(xPhys, viewer);<u></u><u></u></p>
<p class="MsoNormal">CHKERRQ(ierr);<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">PetscObjectSetName((PetscObject)S,"SvonMises");<u></u><u></u></p>
<p class="MsoNormal">ierr = VecView(S, viewer);<u></u><u></u></p>
<p class="MsoNormal">CHKERRQ(ierr);<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">ierr = PetscViewerDestroy(&viewer);<u></u><u></u></p>
<p class="MsoNormal">CHKERRQ(ierr);<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal"><span style="color:rgb(36,41,46)">Best regards,</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:rgb(36,41,46)"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:rgb(36,41,46)">Thijs Smit</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:rgb(36,41,46)"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:rgb(36,41,46)">PhD Candidate</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:rgb(36,41,46)">ETH Zurich</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:rgb(36,41,46)">Institute for Biomechanics</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="DE-CH"> </span><u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">-- <u></u><u></u></p>
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<p class="MsoNormal">What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>
-- Norbert Wiener<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><u></u><u></u></p>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>-- Norbert Wiener</div><div><br></div><div><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div></div></div>