# vtkContourTriangulator (Triangulation failed)

**URL:** <https://discourse.vtk.org/t/vtkcontourtriangulator-triangulation-failed/11127>\
**Category:** Development\
**Created:** [April 4, 2023, 12:21pm UTC](https://discourse.vtk.org/t/vtkcontourtriangulator-triangulation-failed/11127 "2023-04-04T12:21:18Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![PBrockmann](https://discourse.vtk.org/user_avatar/discourse.vtk.org/pbrockmann/32/524_2.png) [@PBrockmann](https://discourse.vtk.org/u/PBrockmann)\
**Post date:** [April 4, 2023, 1:59pm UTC](https://discourse.vtk.org/t/vtkcontourtriangulator-triangulation-failed/11127/3 "2023-04-04T13:59:11Z")

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It seems that vtkContourTriangulator() does not handle 3D coordinates when non planar.

 ![image](https://discourse.vtk.org/uploads/default/original/2X/e/e57cdd3f0b9139b32b841c6deeb8944e6d32a40c.jpeg)

The big picture of this problem is how to get a anti-counter clockwise coordinates of polydata made of lines sometimes folded.

See: [create separated regions from polydata](https://discourse.vtk.org/t/create-separated-regions-from-polydata/10409)

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