[vtkusers] vtkusers Digest, Vol 56, Issue 8

[S, Navneeth (GE, Research)]

Hi David,

You also try the vtkSurfaceReconstructionFilter which implements Huges
Hoppe's '92 SIGGRAPH paper - "Surface reconstruction from unorganized
points". 
There have been several advances in this approach, esp for data from
range scanners... But this is a good starting point.
Look at \VTK\Examples\Modelling\Tcl\ reconstructSurface.tcl 

-
navneeth


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Message: 4
Date: Sun, 7 Dec 2008 08:00:53 -0500
From: "Kevin H. Hobbs" <hobbsk at ohiou.edu>
Subject: Re: [vtkusers] Triangulating a Point Cloud
To: vtkusers at vtk.org
Message-ID: <200812070801.02320.hobbsk at ohiou.edu>
Content-Type: text/plain; charset="utf-8"

On Saturday 06 December 2008 14:12:33 David Doria wrote:
> I have a VTP file with points and associated colors. (
> http://www.rpi.edu/~doriad/points.jpg)
>
> I am trying to obtain a mesh of these points, ie. connect the points 
> to form triangles.
>
> I have tried running the Delaunay 3D and the triangulate filter.
> Triangulate doesn't seem to do anything. Delaunay3D seems to make an 
> extremely coarse mesh (http://www.rpi.edu/~doriad/triangulate.jpg)

You should try cutting through the mesh. You should see all of the nice
small tetrahedra close to where your original points were.

Delaunay 3D produces the convex hull which I think of as shrink-wrapping
the points without turning on the vacuum.

>
> Is there a better way to get an approximate mesh of these points?

You could set the alpha distance on the Delaunay 3D filter which
prevents it from making the big tetrahedra for the convex hull.

You could take a look at the implicit modeler, Shepherd method, and
Gaussian splatter. All of these make an image whose intensity is higher
near the points, and can be contoured or thresholded.
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