CGAL users discussion list

[Graviton <>]

Hello,

I can't quite see how the observer can keep track of the original face, as when the time when I input the arrangement, I don't input in the original face information. Mind to be more explicit about it?

On Tue, Nov 8, 2011 at 6:31 PM, Efraim Fogel [via cgal-discuss] <[hidden email]> wrote:

Extend the cells of the DCEL of the two arrangements [1] and use an
observer [2] to update the additional fields when the arrangements are
constructed. Then, use the overlay traits [3] to update the final
arrangement while performing the overlay operation.

[1]
http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Arrangement_on_surface_2/Chapter_main.html#Section_31.8
[2]
http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Arrangement_on_surface_2/Chapter_main.html#Section_31.7
[3]
http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Arrangement_on_surface_2/Chapter_main.html#Section_31.9

Graviton wrote:

> I have two  http://en.wikipedia.org/wiki/Polygon_mesh  polygonal mesh  , with
> all the usual properties such as vertex and edge and the faces.
>
> Now I want to conduct an overlay between the two, so what I do is, I create
> two arrangements, each for one polygonal mesh, and then use the overlay
> method to come up with the resultant.
>
> The problem is, how to construct each arrangement, such that for each face
> in the arrangement, I can trace it back to the original face in the
> polygonal mesh?  For each face in the polygonal mesh, there is a unique
> meaning assigned to it, so the arrangement has to know this when it is
> constructed.
>
>
>
> --
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> Sent from the cgal-discuss mailing list archive at Nabble.com.
>
>  

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