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Re: [cgal-discuss] CGAL::Polygon_mesh_processing::clip returns self itersecting mesh


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  • From: slidertom <>
  • To:
  • Subject: Re: [cgal-discuss] CGAL::Polygon_mesh_processing::clip returns self itersecting mesh
  • Date: Fri, 24 Jan 2020 09:37:08 -0600 (CST)
  • Authentication-results: mail2-smtp-roc.national.inria.fr; spf=None ; spf=SoftFail ; spf=Pass
  • Ironport-phdr: 9a23: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
I miss typed:
//K::Point_3 plane_pt(0., 2., 0.);
it must be:
//K::Point_3 plane_pt(0., 0.2, 0.);
as:
K::Point_3 plane_pt(0., 0.19999999999999987, 0.);

Just realized, this is probably "edge/rounding" issue:
(0., 2., 0.) generates plane which touch edge
and
(0., 0.19999999999999987, 0.) generates plane which is inside mesh.

CGAL does very precise calculations and result is self intersecting mesh.



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