CGAL users discussion list

[Indika Tantrigoda <>]

Hi Andreas,
Thanks for the link. This seems to be exactly what I need. One more thing does the set of points
need to be given in a certain order? Right now they are not organized or sorted.

Regards,
Indika

2009/8/16 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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