9
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Bug introduced in 10.4.0 and fixed in 11.0


This code produces a MeshRegion in versions 10.0 through 10.3.1,

MeshRegion[{{0.68, 0.88}, {0.84, 0.85}, {1.12, 0.89}, {0.33, 
   1.13}, {0.81, 0.33}, {0.43, 0.33}, {0.15, 1.13}, {0.96, 
   0.33}, {1.12, 0.33}, {1.12, 1.13}, {-0.12, 0.33}, {-0.12, 
   1.13}}, {Polygon[{1, 5, 8, 2, 1}], Polygon[{3, 9, 8, 2, 3}], 
  Polygon[{6, 11, 12, 7, 6}], Polygon[{1, 2, 3, 10, 4, 1}], 
  Polygon[{1, 5, 6, 7, 4, 1}]}]

sample mesh region

But in version 10.4, it returns the input unevaluated. Is this a bug? Am I not using the proper syntax?

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4
  • $\begingroup$ If you remove the dupe points, it works: MeshRegion[{{0.68, 0.88}, {0.84, 0.85}, {1.12, 0.89}, {0.33, 1.13}, {0.81, 0.33}, {0.43, 0.33}, {0.15, 1.13}, {0.96, 0.33}, {1.12, 0.33}, {1.12, 1.13}, {-0.12, 0.33}, {-0.12, 1.13}}, {Polygon[{1, 5, 8, 2}], Polygon[{3, 9, 8, 2}], Polygon[{6, 11, 12, 7}], Polygon[{1, 2, 3, 10, 4}], Polygon[{1, 5, 6, 7, 4}]}] $\endgroup$ Apr 8, 2016 at 16:22
  • 3
    $\begingroup$ @J.M. Yes, this is correct, but there should be a message. I have filed a bug report. $\endgroup$
    – ilian
    Apr 8, 2016 at 16:32
  • $\begingroup$ @J.M. I mistakenly thought that Polygon needed a closed loop, but it apparently will close it itself. My mistake, should I delete this? $\endgroup$
    – Jason B.
    Apr 8, 2016 at 17:48
  • $\begingroup$ Had ilian not commented, I would've agreed with removing this. So, no. $\endgroup$ Apr 8, 2016 at 20:17

1 Answer 1

3
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This has been improved as of version 11.0.0. Now the polygons in the input are reprocessed which results in elimination of the repeated vertices.

enter image description here

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