CGAL users discussion list

[Juan Carlos Lopez Alfonso <>]

Hi Sebastien:

First of all thank you for your answer and your comments. 

In these links you can find my file of set of points and the code of my example, which is simple and exactly as the example "42.5.2   Building Basic Alpha Shapes for Many Points" on the Alpha_Shape charapter of Cgal documentation.

http://dl.dropbox.com/u/2516160/MAIN.cpp

http://dl.dropbox.com/u/2516160/Brainstem_all.txt

About my first question, I beleived that with alpha_shape was obtained an approximated surface of my set of points. In my problem I have a set of points and I need that my resultant triangulation has the exactly same set of points, in the surface and in the interior (I want to create a triangulation of a head with their interior organs).

Best regards and waiting for your help

Juan carlos

On Mon, Nov 14, 2011 at 2:24 PM, Sebastien Loriot (GeometryFactory) <> wrote:

Juan Carlos Lopez Alfonso wrote:

Hi all,

There are any form to use 3D Alpha_Shapes with a general triangulation like Triangulation_3? because Delaunay triangulation or Regular triangulation move my points in order to obtain a linear approximation of the original shape and I need to have a triangulation from a fix set of points.

Nor Delaunay, nor Regular triangulation moves your points. It's building
a triangulation on top of your point set, so what do you mean?

On the other hand, I have created a Delaunay Triangulation (Delaunay  dt;) from a set of points and when I try to create an alpha_shape (Alpha_shape_3 as(dt);) I have the following error:  CGAL::Assertion_exception !!!

Did you read this?
http://www.cgal.org/FAQ.html#inexact_NT

If yes, showing some code might help giving you an answer.

Sebastien.

Best regrads and thank in advance
Juan Carlos

--
You are currently subscribed to cgal-discuss.
To unsubscribe or access the archives, go to
https://lists-sop.inria.fr/wws/info/cgal-discuss