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Re: [cgal-discuss] Wrong unit normal with CGAL::unit_normal


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  • From: "Brown, James 2" <>
  • To: "''" <>
  • Subject: Re: [cgal-discuss] Wrong unit normal with CGAL::unit_normal
  • Date: Thu, 22 Sep 2016 19:06:04 +0000
  • Accept-language: en-US
  • Authentication-results: mail3-smtp-sop.national.inria.fr; spf=None ; spf=Pass ; spf=Pass
  • Ironport-phdr: 9a23:tzrFqRzO1StpmrjXCy+O+j09IxM/srCxBDY+r6Qd0eweIJqq85mqBkHD//Il1AaPBtSBraoYwLON6ujJYi8p2d65qncMcZhBBVcuqP49uEgeOvODElDxN/XwbiY3T4xoXV5h+GynYwAOQJ6tL2PbrnD61zMOABK3bVMzfbWvXNaOxJ3sjqibwN76W01wnj2zYLd/fl2djD76kY0ou7ZkMbs70RDTo3FFKKx8zGJsIk+PzV6nvp/jtM0rzyMF8b0q+MdEFKn7ZK8lVqdwDTI8Mmlz6tek/1GXRgSG4j4QU34djwFTKwnD9hDzGJnr5HjUrO14jWOwJ8rpS/R8ez2n4rwjElWg3CUOMjMitmvNjdN2pKZeqxXnrBt6ld2HKLqJPeZzK/uONegRQnBMC55c
> Do you have any guess as to why, despite it being numerically correct, the
> answer doesn't make any sense. That is, it is a vertical plane instead of
> something more horizontal?

Hi Chris,

You should convert your coordinates to meters using your geodetic datum
first, compute the normal, and then convert back to lat/lon coordinates.

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