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Hi, I'm trying to implement a Tetgen mesh importer for my Petsc/DMPlex-based solver. I am encountering some issues and suspect they might be due to my import process. The Tetgen mesh definitions can be found here for reference: https: //wias-berlin. de/software/tetgen/fformats. htmlI
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<div style="font-family: Arial, sans-serif; font-size: 14px;"><span style="font-size: 10.5pt; line-height: normal;"></span></div><div style="line-height: 30px;"><span style="line-height: normal; font-family: Arial, sans-serif; font-size: 14px; font-weight: 400;">Hi, </span><div><span style="font-family: Arial, sans-serif; font-size: 14px; line-height: normal; font-weight: 400;"><br></span></div><div><span style="font-family: Arial, sans-serif; font-size: 14px; line-height: normal; font-weight: 400;">I'm trying to implement a Tetgen mesh importer for my Petsc/DMPlex-based solver. I am encountering some issues and suspect they might be due to my import process. The Tetgen mesh definitions can be found here for reference: <span><a target="_blank" rel="noreferrer nofollow noopener" href="https://urldefense.us/v3/__https://wias-berlin.de/software/tetgen/fformats.html__;!!G_uCfscf7eWS!c6srXdHHqgkq5FoeJpfHljLrP0U3UJOmz6A1-jLgkMBEtv8NTqRKgVTgoP_ArdJT5e5kx9lX53ecjbzZ3iu3-eoV4-Qq_g$">https://wias-berlin.de/software/tetgen/fformats.html</a></span></span></div><div><span style="font-family: Arial, sans-serif; font-size: 14px; line-height: normal; font-weight: 400;"><br></span></div><div><span style="font-family: Arial, sans-serif; font-size: 14px; line-height: normal; font-weight: 400;">I am building DMPlex using the DMPlexBuildFromCellList function and using the exact ordering of nodes I get from the Tetgen mesh files (.ele file). The resulting mesh looks good when I export it to VTK, but I encounter issues when solving particular PDEs. (I can solve them while using other importers I write) I suspect there may be orientation errors or something similar.</span></div><span style="font-family: Arial, sans-serif; font-size: 14px; line-height: normal; font-weight: 400;"><div style="line-height: 30px;"><span style="font-family: Arial, sans-serif; font-size: 14px; line-height: normal; font-weight: 400;"><br></span></div>So, my question is, Is the ordering of nodes in elements important for tetrahedral elements while using DMPlexBuildFromCellList? If so, how should I arrange them?</span></div><div style="line-height: 30px;"><span style="font-family: Arial, sans-serif; font-size: 14px; line-height: normal; font-weight: 400;"><br></span></div><div style="line-height: 30px;"><font face="Arial, sans-serif">Thanks,</font></div><div style="line-height: 30px;"><font face="Arial, sans-serif">Onur</font></div><div style="line-height: 30px;"><span style="font-family: Arial, sans-serif; font-size: 14px; line-height: normal; font-weight: 400;"><br></span></div>
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