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Re: [cgal-discuss] geometries contour

From: Andreas Fabri <>
To:
Subject: Re: [cgal-discuss] geometries contour
Date: Mon, 17 Aug 2020 10:32:32 +0200
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Ironport-phdr: 9a23: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

Hello,

Do you mean the silhouette?

Do you want to compute it once, or do you look for a data structure to accelerate the computation for many viewpoints?

If it is just once for a view point at infinity then you might use the Lower Envelope package.
https://doc.cgal.org/latest/Manual/packages.html#PkgEnvelope3

Best,

Andreas

On 8/17/2020 9:06 AM, Antoine Lavenant wrote:

Hello everyone,

I'd like to know if there is an easy way to get the contour of any 2d or 3d geometry (a triangulated surface for example).

Thanks,

Antoine

Antoine LAVENANT

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Andreas Fabri, PhD
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Editor, The CGAL Project

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[cgal-discuss] geometries contour, Antoine Lavenant, 08/17/2020
- Re: [cgal-discuss] geometries contour, Andreas Fabri, 08/17/2020

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Re: [cgal-discuss] geometries contour