[vtkusers] Triangulate surface points?

[Andras Lasso]

We get excellent results for sparse point sets using a combination of vtkDelaunay3D, vtkDataSetSurfaceFilter, and vtkButterflySubdivisionFilter. The generated surface includes the exact points that we specify.

You can see what kind of surfaces you can generate from a small number of points:
https://www.youtube.com/watch?v=1mYNwJbE7dQ

You can play with it if you download 3D Slicer and install Volume Clip extension (https://www.slicer.org/slicerWiki/index.php/Documentation/Nightly/Extensions/VolumeClip). Source code is available here:
https://subversion.assembla.com/svn/slicerrt/trunk/VolumeClip/src/VolumeClipWithModel/
(relevant part is in updateModelFromMarkup function)

Andras

From: vtkusers [mailto:vtkusers-bounces at vtk.org] On Behalf Of Cory Quammen
Sent: March 24, 2016 2:29 PM
To: Philip Fackler <philip.fackler at gmail.com>
Cc: vtkusers at vtk.org
Subject: Re: [vtkusers] Triangulate surface points?

Philip,

Please take a look at

http://www.vtk.org/doc/nightly/html/classvtkSurfaceReconstructionFilter.html

and

http://www.vtkjournal.org/browse/publication/718

I don't have direct experience with these classes, but they may have what you need.

HTH,
Cory

On Thu, Mar 24, 2016 at 2:24 PM, Philip Fackler <philip.fackler at gmail.com<mailto:philip.fackler at gmail.com>> wrote:
If someone could even definitively tell me "no, you can't do this" that would be helpful.

Thanks,
Philip Fackler

On Wed, Mar 16, 2016 at 6:24 PM Philip Fackler <philip.fackler at gmail.com<mailto:philip.fackler at gmail.com>> wrote:
Is there a way to triangulate a set of surface points using vtk? I've looked around and everything I've found (vtk, cgal, pcl) only do a surface reconstruction which ends up generating its own points to triangulate. I want to actually use the points I have as the vertices of the triangulation. Along with the point locations, I have a lot of information available in my code that I could provide:

Normal vector at each point
Bounding segmented curve(s) (i.e., lists of edge cells indexing the list of surface points)
A polydata representation of the surface (Note that the points I want to triangulate are distinct from the points involved in this)

The only vtk utility that seems to come close to this is vtkDelaunay2D, but it's only useful if all the points can be mapped to a 2D plane. This isn't possible in general without a parametric surface, which is one bit of information I don't have.
Thanks in advance for the help.

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--
Cory Quammen
R&D Engineer
Kitware, Inc.
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