CGAL users discussion list

["Lehtonen, Matti/HIIT" <>]

Hi!

Hmmm... Are there other functionality to construct 2D surfaces for 3D point
clouds without trying to close all borders (or is in plans for future CGAL) ?

The accuracy of features isn't a problem, I simplified point cloud with one
meter grids.

The "Mesh Generation From a Segmented 3D Image" looks interesting, is there
something similar for classified point clouds?

thx,
Lehtonen, Matti

Quoting 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/
>
>
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Researcher, head programmer - Helsinki Institute for Information Technology 
HIIT
http://www.hiit.fi/
-- 
Life is complex. It has real and imaginary parts.