[vtkusers] closed meshes from vtkDiscreteMarchingCubes?

[Dominik Szczerba]

Dear Bill,

The code and the dataset to reproduce the problem has been posted in 
some of me previous emails. Of course, the main point is it happens on 
one system, but not on the other, which at least to some extent proves 
my innocence. Have you tried the pipeline/dataset on a platform with 
similar characteristics?

Also: you know the marching code far better than I do. Perhaps you can 
suggest where it may potentially go broken (i.e. where merging points 
may fail or not be invoked). I will be happy to add a couple of 
breakpoints and deliver some debugging information.

- Dominik



Bill Lorensen wrote:
> Dominik,
> 
> I was never able to reproduce your problem with disconnected meshes.
> 
> Bill
> 
> On Sun, Aug 16, 2009 at 5:13 AM, Dominik Szczerba<dominik at itis.ethz.ch> wrote:
>> lynx.abraxas at freenet.de wrote:
>>> On 16/08/09 09:41:46, Dominik Szczerba wrote:
>>>> You can of course close the holes with a filter, but you can also pad
>>>> the image to be contoured to avoid their formation.
>>> Padding,  great idea! vtkImageConstantPad is the one to use for that? I
>>> assume
>>> an extention by one voxel at each side is enough?
>>> Can I be sure then that any  mesh  from  vtkDiscreteMarchingCubes  of
>>>  only  a
>>> single label is a manifold on its own and suitable for vtkMassProperties?
>> No. As I recently discovered, in some cases you can get a series of
>> geometrically continuous but topologically disconnected regions (instead of
>> the expected one region) that you have to glue together before.
>>
>> Dominik
>>
>>> Thanks a lot for the padding tip.
>>> Lynx
>>> _______________________________________________
>>> Powered by www.kitware.com
>>>
>>> Visit other Kitware open-source projects at
>>> http://www.kitware.com/opensource/opensource.html
>>>
>>> Please keep messages on-topic and check the VTK FAQ at:
>>> http://www.vtk.org/Wiki/VTK_FAQ
>>>
>>> Follow this link to subscribe/unsubscribe:
>>> http://www.vtk.org/mailman/listinfo/vtkusers
>>>
>>
>> --
>> d o m i n i k   s z c z e r b a ,   p h d . . . . . . . . . . .
>> c o m p u t a t i o n a l   l i f e   s c i e n c e   g r o u p
>> . . . . . . . i t ' i s   r e s e a r c h   f o u n d a t i o n
>> . . . . . . . . . . . . . . . . . . . . http://www.itis.ethz.ch
>>
>> _______________________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at
>> http://www.kitware.com/opensource/opensource.html
>>
>> Please keep messages on-topic and check the VTK FAQ at:
>> http://www.vtk.org/Wiki/VTK_FAQ
>>
>> Follow this link to subscribe/unsubscribe:
>> http://www.vtk.org/mailman/listinfo/vtkusers
>>
> 


-- 
d o m i n i k   s z c z e r b a ,   p h d . . . . . . . . . . .
c o m p u t a t i o n a l   l i f e   s c i e n c e   g r o u p
. . . . . . . i t ' i s   r e s e a r c h   f o u n d a t i o n
. . . . . . . . . . . . . . . . . . . . http://www.itis.ethz.ch