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  • #17990
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Issue created Aug 28, 2020 by Mathieu Westphal@mwestphalMaintainer

VTK Polyhedron contour is incoherent with other cell type

Contouring a polyhedron on its edge has not the samebehavior as with other celltype.

  • run ParaView
  • Open polyhedral-sliceY0-holes-2.vtu
  • Slice in Y == 0
  • There are holes
  • Tetrahedralize the dataset
  • Slice in Y == 0
  • No holes

image

Original issue, now fixed

Consider this dataset : poly.vtu, slicing it on the top or on the bottom is different with or without a tetrahedralize.

Step to reproduce (with ParaView) :

  • Open ParaView
  • Open poly.vtu, Apply
  • Add a slice filter, Y axis, Y coord: 5, Apply
  • No slice is produced
  • Y coord: -5, Apply,
  • Slice is produced
  • Remove slice
  • Add Tetrahedralize
  • Add a slice filter, Y axis, Y coord: 5, Apply
  • Slice is produced
  • Y coord: -5, Apply,
  • no slice is produced

So the results are inverted when using a polyhedron. This can case holes when slicing through datasets containings mixed cell types including polyhedrons, eg : threecells.vtu.

Slicing on Y==0 will produce an empty slice when it clearly should have at least produce half a slice.

image

Edited Dec 05, 2022 by Mathieu Westphal
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