[vtkusers] Re: how to determine Holes in Polydata ?

[bailleul jonathan]

That's it!

If you just want to check if there are holes, then you're done.


If you want to repair the polydata after the process, the idea is to 
locate the edges delimitating the 'hole' on the closed polydata surface 
- since i'm always in trouble for locating whch class can perform a 
given task, I did it in retrieving the number of neighbors  of each edge 
with polydata (?) class.

Then, if the hole is limited to a single triangle, that's easy: just 
check if, given the AB border edge, you can find both BC and AC as 
border edges, then add ABC triangle to the polydata.

For bigger holes, I started to build a path of border edges, then 
finding a way to patch the hole using a foreign class from Verant I hand 
under my hand, but many bugs are still present...


my 2 cents again,



Goodwin Lawlor wrote:
> vikrant aglawe wrote:
> 
>> Hi,
>>
>> I am currently trying to decimate a given topology using vtkDcimate 
>> pro filter.
>>
>> In order to achieve required reduction I had to turn the topology 
>> preservation flag OFF and boundary vertex deletion flag ON, which,
>>
>> according to vtk documentation, can generate holes and nonrectangular 
>> surfaces. Is their a way to determine
>>
>> if holes occur in the process of decimation or when the boundary 
>> becomes non rectangular?
>>  
>> vikrant
> 
> 
> Hi Vikrant,
> 
> 
> Have a look at vtkFeatureEdges
> 
> hth
> 
> 
> Goodwin
> 
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-- 
---------------------------------------
Jonathan BAILLEUL, ATER
Dept. Génie Biomédical - UTC Compiègne
Doctorant au GREYC Image - ENSICAEN
http://www.greyc.ensicaen.fr/~bailleul/