[vtkusers] VTK File Writing

[Xiaofeng Z]

You can try vtkCleanPolyData filter, but it does not work very well in all applications.

Xiaofeng Zhao





> Date: Wed, 11 Aug 2010 15:48:59 +0300
> From: mrapsouthern at gmail.com
> To: vtkusers at vtk.org
> Subject: Re: [vtkusers] VTK File Writing
> 
> Ha of course, I knew that just didnt put it all together thanks.
> 
> So I guess the solution is to split the polygon into triangles? Is there 
> not a already defined algorithm to do this for an abitrary polygon? If 
> so where can I find it... ?
> 
> Thanks
> Alex
> 
> 
> On 11.8.2010 15:41, Bill Lorensen wrote:
> > http://en.wikipedia.org/wiki/Convex_polygon
> >
> >
> > On Wed, Aug 11, 2010 at 8:36 AM, Alex Southern<mrapsouthern at gmail.com>  wrote:
> >    
> >> Hmmm,
> >>
> >> What do you mean by convex? The geometry has no curves in it. Its just a 6
> >> sided polygon.
> >>
> >> I must be missing something... please explain.
> >>
> >> Thanks
> >> Alex
> >>
> >> On 11.8.2010 15:33, Sebastien Jourdain wrote:
> >>      
> >>> A ploygon cell in VTK can not be convex. So you will have to split it
> >>> in two cells.
> >>> And I don't know if there is an automatic way to do it by using a
> >>> given filter in VTK and writing the file again.
> >>>
> >>> Seb
> >>>
> >>> On Wed, Aug 11, 2010 at 7:25 AM, Alex Southern<aps at tml.hut.fi>    wrote:
> >>>
> >>>        
> >>>> Hi,
> >>>>
> >>>> Could you guys take a look at this vtk file I wrote, can you see anything
> >>>> wrong with it? I can't, but if you take a look at the JPG of paraview
> >>>> screenshots, you will see that the single polygon looks fine in wire
> >>>> frame
> >>>> mode but has some weird error when viewed as a surface, this is happening
> >>>> with a few files I have written, but the is the most basic geometry it
> >>>> occurs with.
> >>>>
> >>>> JPG at http://www.tml.tkk.fi/~aps/<http://www.tml.tkk.fi/%7Eaps/>
> >>>>
> >>>> Thanks
> >>>> Alex
> >>>>
> >>>> # vtk DataFile Version 3.0
> >>>> VTK File Exmaple
> >>>> ASCII
> >>>> DATASET POLYDATA
> >>>> POINTS 6 float
> >>>> 0.0 81.8897637795276 0.0
> >>>> 43.7007874015748 81.8897637795276 0.0
> >>>> 43.7007874015748 150.748031496063 0.0
> >>>> 94.9606299212598 150.748031496063 0.0
> >>>> 94.9606299212598 0.0 0.0
> >>>> 0.0 0.0 0.0
> >>>> POLYGONS 1 7
> >>>> 6 0 1 2 3 4 5
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