[vtkusers] re-orienting faces coherently

[gauravG]

Thanks you very much. I will try that. I thought normals might be needed
for filling holes and not for writing a ply file. thanks again.

On Thu, Mar 21, 2013 at 7:42 PM, David Gobbi [via VTK] <
ml-node+s1045678n5719530h78 at n5.nabble.com> wrote:

> Hi Guarav,
>
> If vtkFillHolesFilter is causing the inconsistent faces, right?  So if
> vtkPolyDataNormals is supposed to fix the problem, doesn't it make
> more sense to put it after FillHoles, instead of before?
>
> Also, as I said in my first email, Consistency is an _option_ for
> vtkPolyDataNormals.  That means you need SetConsistency(1) in
> order for it to take effect.
>
> I hope this helps.
>
>  - David
>
> On Thu, Mar 21, 2013 at 7:53 AM, gauravG <[hidden email]<http://user/SendEmail.jtp?type=node&node=5719530&i=0>>
> wrote:
>
> > David,
> > Thanks for the reply. what I am doing is very much similar to the
> filling
> > holes example @ (
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/Meshes/FillHoles).
> > As shown in the figure in the above link, the normals of the filled
> holes
> > are not consistent with the rest of the model.
> > As per your suggestion, I calculated normals (both point & cell) for the
> > vtkpolydata input similar to the example @
> > http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/PolyDataExtractNormals
> > with the consistency on and flag set to 1before passing to the fill
> holes
> > filter. Still my output file seem to have inconsistent faces. I could
> send
> > you my code but it is essentially a copy paste from the above two
> examples.
> > Am I missing anything? thanks again for the help. I really appreciate
> it.
> > here is my pipeline
> >
> > ply reader to read
> > vtkpolydata filter for deepcopy
> > compute normals (vtkpolydatanormals)
> > filling holes vtkFillHolesFilter
> > Ply writer
> >
> > gaurav
> >
> >
> > On Thu, Mar 21, 2013 at 6:50 PM, David Gobbi [via VTK] <[hidden email]>
> > wrote:
> >>
> >> Hi Guarav,
> >>
> >> Your description of what you've done is too vague for me to help you.
> >> Write out the full names of the filters that you are using, plus a
> >> summary of the options that you are using with each filter.
> >>
> >>  - David
> >>
> >> On Thu, Mar 21, 2013 at 1:55 AM, gauravG <[hidden email]> wrote:
> >>
> >> > David-
> >> > thanks a bunch for the reply.
> >> > Here is my pipeline;
> >> > reader->polydata->fillholes filter-> writer;
> >> >
> >> > Now I computed point and cell normals for the polydata consistently.
> >> > still
> >> > the output faces are inconsistent. Am I missing anything.
> >> > thanks again,
> >> > gaurav
> >> >
> >> >
> >> > On Thu, Mar 21, 2013 at 11:49 AM, David Gobbi [via VTK] <[hidden
> email]>
> >> > wrote:
> >>
> >> >>
> >> >> Hi Guarav,
> >> >>
> >> >> Consistency is one of the options for vtkPolyDataNormals.
> >> >>
> >> >> On Thu, Mar 21, 2013 at 12:14 AM, gauravG <[hidden email]> wrote:
> >> >> > Hi- I'm trying to re-orient faces coherently after reconstruction
> and
> >> >> > hole
> >> >> > filling. Is there a way to accomplish this in VTK. The hole filled
> >> >> > have
> >> >> > a
> >> >> > orientation opposite to the neighboring faces.
> >> >> > thanks in advance
> >> >> > Gaurav
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