CGAL users discussion list

[Andreas Fabri <>]

Hi Indika,

Note that the point set processing package
http://www.cgal.org/Manual/beta/doc_html/cgal_manual/Point_set_processing_3/Chapter_main.html
offers what you are looking for
- normal estimation
- outlier removal
- ..

best regards,

andreas


Indika Tantrigoda wrote:
> Hello,
> Thank you very much for the information. The link you sent seems useful.
> I should be able to work something out with this.
>
> Regards,
> Indika
>
> 2009/8/15 Bo Zhou < 
> <mailto:>>
>
>     Indika Tantrigoda wrote:
>
>         He,
>         Thanks for the reply. I'll have a look at chapter 34. I did
>         however go through the link you mentioned.
>         The problem is that the methods given in the link such as
>         Possion surface reconstruction and using Octrees require
>         the surface normals. But these are not available, only the x,y,z
>         co-ordinates of the points which forms the point cloud.
>
>         Is there any method that can be used when the surface normals
>         are not present to construct a mesh ???
>
>         Regards,
>         Indika
>          
>         2009/8/14 Bo Zhou <
>         
> <mailto:>
>         
> <mailto:
>         
> <mailto:>>>
>
>
>            Indika Tantrigoda wrote:
>
>                Hello,
>                I am in the middle of a research where I try to reconstruct a
>                3D model based on photographs.
>                So far I am able to obtain a sparse point could
>         containing the
>                points of the object. I have developed a point cloud
>                viewer in XNA to view this point cloud data.
>                What I would like to do is to generate a dense 3D model based
>                on this point could. Would this be possible with CGAL, if so
>                any advice would be very much appreciated.
>                I recently found out about CGAL and my knowledge in using
>         CGAL
>                is very minimal (non actually).
>
>                Thanks in advance.
>
>                Regards,
>                indika
>
>            Hi,
>
>            It seems that you want to reconstruct mesh from point cloud, you
>            could have a look at
>
>            *Chapter 34 3D Alpha Shapes*
>
>            or
>            to find some useful implementation here
>
>            http://www.cs.jhu.edu/~misha/Code/
>         <http://www.cs.jhu.edu/%7Emisha/Code/>
>            <http://www.cs.jhu.edu/%7Emisha/Code/>
>
>
>            Thanks.
>
>            --    /**
>            * Bo Zhou
>            * Blog : http://jedimaster.cnblogs.com
>            * Mobile : +86 13451813691
>            */
>
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>
>     Hello,
>
>     I think it's not difficult to generate per-vertex normal by CGAL,
>     you can generate a KDTree then lookup several nearest neighbors to
>     calculate the normal. I remember to use ANN library to do spatial
>     search because the CGAL's implementation is not fast enough.
>
>     The RBF implicit surface reconstruction method does not require
>     normal, but I have not found a public sources, you will see
>     something useful in this thesis here,
>
>     http://www.labri.fr/perso/preuter/research/thesis/index.html
>
>     Thanks.
>
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