[vtkusers] Triangulate surface points?

[Cory Quammen]

Andras,

That's a good idea as well, but doesn't vtkDelaunay3D produce a convex hull
of the input points? That's fine if your object is convex, of course, but
may not give you the expected results if your object has a concave region.

If there is a feature in vtkDelaunay3D that can produce concave surfaces, I
would be interested to know about it.

Thanks,
Cory

On Fri, Mar 25, 2016 at 8:34 AM, Andras Lasso <lasso at queensu.ca> wrote:

> 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>
> 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>
> 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.
>



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