[vtkusers] Re: Module for solid contours?

[Goodwin Lawlor]

Hi Charles,

Its in the bug tracker so its up to the powers that be. Ideally,
vtkBandedPolyDataContourFilter should be fixed. If not, maybe a flag
"RecursiveImplementation" could be used to switch the implentation within
vtkBandedPolyDataContourFilter. I need the surface area of each of the solid
contours- not just to visualize them- so I need to be confident that the
contouring is done correctly.

Goodwin

----- Original Message ----- 
From: "Charles Boivin" <Charles.Boivin at rwdiwest.com>
To: <vtkusers at public.kitware.com>; <goodwin.lawlor at ucd.ie>
Sent: Friday, September 03, 2004 6:08 PM
Subject: [vtkusers] Re: Module for solid contours?


> Hi Goodwin,
>
> Thank you for the warning.. I will have a look at this. Any plans on
> this being in the next release of VTK?
>
> Charles
>
> >>> "Goodwin Lawlor" <goodwin.lawlor at ucd.ie> 09/03/04 10:14am >>>
> Hi Charles,
>
> Sometimes the output of vtkBandedPolyDataContourFilter is unexpected,
> cf
> http://www.vtk.org/Bug/bug.php?op=show&bugid=727&pos=27
> http://public.kitware.com/pipermail/vtkusers/2004-March/022780.html
>
> I wrote a class with the same interface as
> vtkBandedPolyDataContourFilter
> but the implemetation recursively uses a vtkPolyDataClip internally to
> produce the bands or "solid contours". This class doesn't seem to
> produce
> the artifacts that vtkBandedPolyDataContourFilter does. Here it is:
>
> http://www.bioengineering-research.com/vtk/vtkRecursivePolyDataClip.cxx
>
> http://www.bioengineering-research.com/vtk/vtkRecursivePolyDataClip.h
>
> Ideally, it would be better to find the bug/reason for behaviour in
> vtkBandedPolyDataContourFilter
>
> hth
>
> Goodwin
>
> ps. probably should have named the class vtkRecursiveClipPolyData to
> be
> consistent... but it was just written as a test.
>
>
> "Charles Boivin" <Charles.Boivin at rwdiwest.com> wrote in message
> news:s137042c.059 at mailwest.rwdiwest.com...
> > Hello all,
> >
> > I would like to be able to visualize my data using "solid contours".
> I
> > am not sure if this terminology is the correct one, but I know this
> is
> > the name used in AVS, for example. Basically, I'd like to get the
> same
> > information as with isolines, but with the regions between the lines
> all
> > of a uniform color. I have attached a picture (generated in AVS)
> that
> > illustrates what I would like.
> >
> > Is there a module in VTK that allows one to do such a thing? I have
> > tried playing with the lookup table, and it is the closest I've been
> > able to get to the right solution. The problem with this, however, is
> I
> > still get some interpolation across cells, and the results are very
> > blocky (because of underlying grid).
> >
> > Thank you,
> >
> > Charles Boivin
> >
>
>
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