[vtk-developers] Fwd: Surface

[Will Schroeder]

Mark-

Try disabling vertex deletion:

  // Description:
  // Turn on/off the deletion of vertices on the boundary of a mesh. This
  // may limit the maximum reduction that may be achieved.
  vtkSetMacro(BoundaryVertexDeletion,int);
  vtkGetMacro(BoundaryVertexDeletion,int);
  vtkBooleanMacro(BoundaryVertexDeletion,int);

If problems remain let me know please.

Will

On Mon, Feb 21, 2011 at 11:40 AM, Mark Roden <mmroden at gmail.com> wrote:

> Hi VTK developers,
>
> There appears to be some problems running decimation routines of large
> volumes in parallel.  This is a bug report forwarded by one of the
> gdcm contributors for their large project involving both gdcm and vtk.
>
> Thanks,
> Mark
>
>
> ---------- Forwarded message ----------
> From: totonixsame at gmail.com <totonixsame at gmail.com>
> Date: 21 February 2011 10:21
> Subject: Superficie
> To: Paulo Henrique Junqueira Amorim <paulojamorim at gmail.com>
>
>
> Hi,
>
> In InVesalius we generate a vtkPolydata from a medical vtkImageData
> using marching cubes. But the vtkImagedata we are working are very
> large, like 512x512x1000, in a 32-bit OS it crashes and is a lot slow.
> So we thought in parallelize this part of software, then InVesalius
> could generate vtkPolydata faster. To do that firstly we split the
> vtkImagedata in smaller pieces, to each pieces we do this pipeline:
>
> vtkMarchingCubes -> vtkTriangleFilter -> vtkDecimatePro
> (PreserveTopologyOn and SetTargetReduction(0.3)
>
> Each piece can run in parallel.
>
> After all piece are processed we join them, using this pipeline:
>
> vtkAppendPolyData -> vtkCleanPolyData -> vtkStripper
>
> Then it shows to the user. But it has a problems: In junctions there
> is some marks like showed in [1] and [2]. When I open the STL
> generated from that vtkPolydata in Meshlab, for example, in those
> junctions there are some holes [3] and [4].
>
> Do you have some idea why that problem occurs? I have to use some
> other filter(s)?
>
> Thanks!
>
> [1] - http://i.imgur.com/MLXPw.png
> [2] - http://i.imgur.com/DRFHy.png
> [3] - http://i.imgur.com/0RB45.png
> [4] - http://i.imgur.com/70fIa.png
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-- 
William J. Schroeder, PhD
Kitware, Inc.
28 Corporate Drive
Clifton Park, NY 12065
will.schroeder at kitware.com
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(518) 881-4902
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