[vtkusers] contour of a projected mesh

[Nicolas Sarrasin]

  Bonjour, merci de votre réponse.

Ce n'est pas tout à fait celà.

Je projette les points du maillage sur le plan z=0, dont j'obtiens un 
nouvel ensemble de points.

C'est ce nouvel ensemble que je triangule avec vtkDelaunay2D. Seulement 
le résultat est convexe, ce qui est normal théoriquement, mais je 
souhaite conserver la "convexité" de la forme projetée.

Par exemple si je projette les points d'un tore sur le plan z=0, avec 
vtkDelaunay2D je vais obtenir un disque triangulé alors que ce que je 
souhaite c'est un anneaux triangulé.

Je pensais donc triangulé mon ensemble de points en contraignant le contour.
A vrai dire, je ne sais pas si vtk propose ce genre de chose.

Si vous avez une solution à me proposer.

Cordialement.

==== translation ====

I am projecting the points of my mesh on the plane z=0, the result is a 
new set of points.

It's that new set I want to triangulate with vtkDelaunay2D. 
VtkDelaunay2D gives me a convex triangulation, which is correct in 
theory but not what I want (eg take a torus as an example. If I project 
its points on z=0 and triangulate them I'll get a triangulated disk 
whereas what I want is a triangulated ring).

My point of view was to triangulate my set of points giving its contour 
(ie the contour of the projection of my mesh) as a constraint. But in 
fact, I'm not sure I can do that with Vtk.

Any suggestion is welcome.

Cordialy

Le 29/07/2010 15:41, Frederic DANESI a écrit :
>
> Vous disposez d'une surface et vous voulez obtenir les bords 
> extérieurs c'est bien cela (à partir d'une tranche de l'objet à 
> prototyper peut etre ?) ?
>
> Cordialement,
>
> F.Danesi
>
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> *De :* vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] *De 
> la part de* Nicolas Sarrasin
> *Envoyé :* jeudi 29 juillet 2010 09:20
> *À :* vtkusers at vtk.org
> *Objet :* [vtkusers] contour of a projected mesh
>
> Hi everyone,
>
> Is there a way to get the real (ie not convex) contour of a set a 
> planar points ?
>
> I am projecting a mesh on the plane z=0 and I would like to get the 
> real contour of this result.
>
> I looked around vtkSilhouette but didn't get a staisfied result.
>
> First of all, maybe I badly used this function so I need some explanation.
>
> Secondly, is there another to get what I want ?
>
> Thanks by advance.
>
> --
>

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