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From the Petsc manual pages, I fail to understand what the orientations of cones and transitive closures mean.

In particular, how can I relate these numbers to the orientation of the length/area/volume of the corresponding mesh components ? How can I retrieve the notion of "relative orientation of a face within a cell", with which I am more familiar.

Thanks in advance

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    $\begingroup$ That's a question you really ought to ask Matt Knepley on the PETSc mailing lists. But I think you're on the wrong track: The cone you're talking about is simply one in the graph that connects the different pieces of a DMPLEX. It has no geometric meaning that would relate to length/area/volume. $\endgroup$ – Wolfgang Bangerth Sep 3 at 14:04
  • $\begingroup$ After reading similar posts on the PETSc mailing list, I have come to the same conclusion as you : these orientations do not have the meaning I gave them. $\endgroup$ – G. Fougeron Sep 6 at 10:08

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