[vtkusers] vtkCutClosedSurface

[sebastian ordas]

Hi David,

sorry, my mistake
I had a copy and paste typo in one of my actors: 
actor->SetScale(1.01,1.01,1.01);

I tested vtkDelaunay2D. It looks pretty stable but I would like to avoid 
meshing the holes and outside the contour:
http://ScrnSht.com/grcbwa

For the former, I guess I need to use "SetSourceConnection" right?
But how to avoid the latter?

best regards,
sebastian


On 10/7/2011 12:00 PM, David Gobbi wrote:
> Hi Sebastian,
>
> The filter does not move any points in the mesh (it just adds/removes
> points).  Check the transform matrices for your actors, from the
> picture it looks more like a scale difference than a shift but it is
> hard to tell.
>
>   - David
>
>
> On Fri, Oct 7, 2011 at 7:42 AM, sebastian ordas
> <sebastian.ordas at gmail.com>  wrote:
>> 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
>>