[vtkusers] How to generate a mesh from surface points (original surface not convex)

[lynx.abraxas at freenet.de]

On 24/10/09 22:28:01, David Doria wrote:
> On Sat, Oct 24, 2009 at 9:18 PM, Gao, Yi <gaoyi.cn at gmail.com> wrote:
> > Hi Bill,
> >
> > My impression on the Gauss Splat, at
>                                                                            >
http://www.itk.org/Wiki/Create_a_surface_from_Unorganized_Points_(Gaussian_Splat)
> > seems to be able to achieve this point-->surface reconstruction.
> >
> > However from your message seems that I misunderstood the its usage, or
> > David's problem. Could I know the difference?
> >
> > Thanks!
> > yi
>
> Yi,
>
> You are right, I forgot about that. From my understanding, that
> procedure makes a volumetric grid of data and "fills" it with
> volumetric blobs around each point. Then it finds the surface of those
> blobs using the ContourFilter. I guess I didn't test this extensively,
> but it seems to produce very "blobby" surfaces. I suppose there are
> some parameters that can be tuned, but this is a fundamentally
> different process than the point normal estimation->surface
> reconstruction that CGAL has. What did you use it for, Yi? I was
> trying to make a model from several registered LiDAR scans, but the
> outliers were causing ridiculous surfaces to be made. I suppose that
> might be the same result for the CGAL reconstruction, but they have
> nice outlier rejection, simplification, and smoothing things to deal
>                                   with                                  that
(http://www.cgal.org/Manual/last/doc_html/cgal_manual/Point_set_processing_3/Chapter_main.html).
> I've just started working on implementing some of this stuff for VTK,
> are you interested in helping?

I just had the idea that the bobby splatter surface might allow me to estimate
a normal for each point that I then could use  for  the  cgal  reconstruction.
I'll need some time to test that. I'm not sure if I've enough knowledge yet to
help implementing.

Regards,
Lynx