[petsc-dev] DMPlexCreateBoxMesh Simplex Ordering?

[Jacob Faibussowitsch]

Hello all,

The ascii diagram showing the point numbering for DMPlexCreateBoxMesh seems off? There are duplicated numberings, and it does not seems to stack up against -dm_view ascii::ascii_info_detail. For example for a 2x2 2D mesh the bottom half is 

11----6---12----7----13
 |\        |\        |
 | \    1  | \     3 |
10   0    11    1    12
 | 0   \   | 2   \   |
 |       \ |       \ |
 8----4----9----5----10
But the corresponding support output from dm_view is 

Supports:
[0] Max support size: 6
[0]: 8 ----> 17
[0]: 8 ----> 19
[0]: 9 ----> 17
[0]: 9 ----> 18
[0]: 9 ----> 23
[0]: 9 ----> 27
[0]: 10 ----> 24
[0]: 10 ----> 25
[0]: 10 ----> 27
[0]: 11 ----> 18
[0]: 11 ----> 19
[0]: 11 ----> 21
[0]: 11 ----> 22
…

Which at least implies that face 4 = 17, face 10 = 19. Is this as a result of using a particular generator for the mesh? It was my understanding they all generate numberings in lexicographical CW ordering so should all produce the same numbering?

Best regards,

Jacob Faibussowitsch
(Jacob Fai - booss - oh - vitch)
Cell: (312) 694-3391

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