# Test for simple polygon

**URL:** <https://discourse.vtk.org/t/test-for-simple-polygon/12287>\
**Category:** Development\
**Created:** [September 14, 2023, 5:17pm UTC](https://discourse.vtk.org/t/test-for-simple-polygon/12287 "2023-09-14T17:17:16Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Ron84](https://discourse.vtk.org/user_avatar/discourse.vtk.org/ron84/32/630_2.png) [@Ron84](https://discourse.vtk.org/u/Ron84)\
**Post date:** [September 14, 2023, 5:17pm UTC](https://discourse.vtk.org/t/test-for-simple-polygon/12287/1 "2023-09-14T17:17:16Z")

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Does VTK have any method to test if a polygon is not simple? Or do I have to implement it for myself? It seems that vtkPolygon does not have anything like that. But why not?