CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

find_optimal_alpha give you the smallest alpha such that the
alpha complex is solid. This does not mean that it will
return the surface you are expecting. In particular the reconstructed
surface can have a high genus (which seems to be your case). You can
increase the value of alpha and see what you get.

You can play with the Alpha_shape_3 demo which has a slider bar
to see if you can get a result that fits your need.
The file format read is:

n
x1 y1 z1
...
xn yn zn



Sebastien.

Juan Carlos Lopez Alfonso wrote:
> Hi all:
>
> I have an input set of points which is a close contours in parallel planes: 
>
> http://dl.dropbox.com/u/2516160/image2.png
> http://dl.dropbox.com/u/2516160/PTV_all.txt
>
> Why when I use the alpha shape class I obtain something like this:
>
> http://dl.dropbox.com/u/2516160/image3.png
>
> when I want that the shape of the 3d-triangulation contour adjusts the 
> shape of my set of points.
>
> This is my code:
> http://dl.dropbox.com/u/2516160/main.txt
>
> Best regards
> Juan Carlos