CGAL users discussion list

[Andreas Fabri <>]

Hi Matti,

It is inherent to the Poisson surface reconstruction algorithm to
close the surface.

Note also that it will probably not nicely mesh your buildings,
as the algorithm works well for smooth surfaces, but not for
sharp features (like 90 degree angles of walls).

Best regards,

Andreas Fabri

On 31/05/2010 17:28, Lehtonen, Matti/HIIT wrote:
> Hi!
>
> I have processed very small lidar point cloud (~ 1/4 million [classified]
> points, see attached kylmaoja-xyzc-3Dview.png) according to chapters "Chapter 
> 54
> Point Set Processing" and "Chapter 45 Surface Reconstruction from Point Sets"
> (CGAL 3.5 manuals).
>
> To my very BIG surprise, I get half ball feature under point cloud (see
> mesh800-boundary-pic1.png), even when I am using
> CGAL::Manifold_with_boundary_tag(). Would some other combination of parameters
> for CGAL::make_surface_mesh() [or any other function] prevent such unwanted
> features in mesh generation??
>
> I am using CGAL 3.5.1-1 (Ubuntu 10.04).
>
> What else [from CGAL] would be suggested for surface mesh generation (with
> different level-of-details) of classified point clouds?
>
> Thx,
> Lehtonen, Matti
> Researcher, head programmer - Helsinki Institute for Information Technology 
> HIIT
> http://www.hiit.fi/