[vtkusers] How to generate smooth line

[Dominik Szczerba]

Hi,
Please, stay on the mailing list. I simply walk the nodes and average
their positions (you have to BuildLinks() before to access the
neighbors). Just study the multiple polydata examples on that. This will
of course lose features, a disadvantage to some extent correctable by
projection of the smoothed nodes back onto the original poly-line (RTFM
on PointLocator, FindClosestPoint, and references therein).
- Dominik

YaoHaofeng wrote:
> Hi Dominik,
> I have not found a vtk class that does that smoothing, you may try 
> vtkSmoothFilter, but in my case it does not work.
> Could you please tell me how you smooth the lines without vtk class? do 
> you use a integral? Because I am a beginner in graphics, so it would be 
> very appreciated if you could offer some help.
> 
> many thanks
> 
> hank
> 
> 
> 
> 
> ------------------------------------------------------------------------
>  > Date: Thu, 17 May 2007 11:05:35 +0200
>  > From: domi at vision.ee.ethz.ch
>  > To: Paul at opes.com.au
>  > CC: hfyao1983 at hotmail.com; vtkusers at public.kitware.com
>  > Subject: Re: [vtkusers] How to generate smooth line
>  >
>  > Thanks a lot for the hint, but it is an overkill in my case. I just need
>  > to smooth the LINES the same way I would smooth a POLYDATA mesh. I
>  > cannot pray the SmoothPolydataFilter do the job. Hints are highly
>  > appreciated.
>  > - Dominik
>  >
>  > Paul Tait - OPES wrot e:
>  > > vtkKochanekSpline or vtkCardinalSpline
>  > >
>  > > -----Original Message-----
>  > > From: vtkusers-bounces+paul=opes.com.au at vtk.org
>  > > [mailto:vtkusers-bounces+paul=opes.com.au at vtk.org] On Behalf Of Dominik
>  > > Szczerba
>  > > Sent: Wednesday, 16 May 2007 6:52 PM
>  > > To: YaoHaofeng
>  > > Cc: vtkusers at public.kitware.com
>  > > Subject: Re: [vtkusers] How to generate smooth line
>  > >
>  > >
>  > > I use the tubeFilter for that with datasets of about a milion 
> segments and
>  > > it fits into 2GB.
>  > >
>  > > Smoothing lines is a problem for me too: the smoothFilter works 
> very well
>  > > but only for polygons, not lines. For the moment I just smooth them 
> myself,
>  > > but would be glad to have it done the vtk way.
>  > >
>  > > DS
>  > >
>  > > YaoHaofeng wrote:
>  > >> I have a set of lines in vtkAppendP olydata filter to form some brain
>  > >> tracts, which then fed into the polydataMapper, but they are white and
>  > >> look very bad, there are some programs that generate smooth lines as:
>  > >> http://people.csail.mit.edu/lauren/dti_pic5_large.png
>  > >>
>  > >> can anybody tell me how to generate the same effect for the lines? I
>  > >> tried to feed the vtkAppendPolydata filter into the tubeFilter but it
>  > >> says the problem is too big to fit into the memory.
>  > >>
>  > >> thanks
>  > >>
>  > >> hank
>  > >> _________________________________________________________________
>  > >> 使用下一代的 MSN Messenger。
>  > >>
>  > > 
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>  > >
>  > > --
>  > > Dominik Szczerba, PhD
>  > > Computer Vision Lab CH-8092 Zurich http://www.vision.ee.ethz.ch/~domi
>  > > _______________________________________________
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>  >
>  > --
>  > Dominik Szczerba, PhD
>  > Computer Vision Lab CH-8092 Zurich
>  > http://www.vision.ee.ethz.ch/~domi
> 
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-- 
Dominik Szczerba, PhD
Computer Vision Lab CH-8092 Zurich
http://www.vision.ee.ethz.ch/~domi