[vtkusers] vtkCutClosedSurface

[sebastian ordas]

Thank you David!

btw, using vtkClipClosedSurface, I´m getting a small shift between the 
original mesh and the closed clipped surface
http://ScrnSht.com/byxsiw

Is that a visualization issue only?

regards,
sebastian


On 10/7/2011 3:06 AM, David Gobbi wrote:
> On Thu, Oct 6, 2011 at 4:06 PM, sebastian ordas
> <sebastian.ordas at gmail.com>  wrote:
>> Dear VTK developers,
>>
>> Following the explanation in
>> http://www.vtk.org/Wiki/VTK/Closed_Surface_Clipping
>> I was wondering about the current development state of the
>> vtkCutClosedSurface class or a similar one.
> It has not been written.  Eventually I might need it, and when I do,
> I'll write it... but that could be in a few months, a few years, or
> never.
>
>> I´m basically needing the meshing of a contour, possibly with holes, but
>> always closed.
> You can use vtkDelaunay2D for that, but be warned that some inputs
> will cause vtkDelaunay2D to segfault (it is rare, but it does happen
> occasionally).
>
>> I found this interesting:
>> http://www.geometrictools.com/Documentation/TriangulationByEarClipping.pdf
> That method is very similar to the one that vtkClipClosedSurface uses.
> It is messy but it is robust.  The fastest triangulation methods are
> randomized Delaunay methods, but they are very sensitive to roundoff
> error, and as a result it is hard to write a robust Delaunay algorithm.
>
>> Does anyone know a workaround (has to be fast, for a real time application)
>> with existing VTK classes?
> For now, vtkDelaunay2D is the only class for doing triangulations with holes.
>
>   - David