[vtkusers] Problem with vtkPolyDataToImageStencil in 5.8

[Jothybasu Selvaraj]

Yes, I have one contour for each z slice as a vtkPolyData. I will try
removing that.

Thanks

On Tue, Mar 6, 2012 at 1:26 PM, David Gobbi <david.gobbi at gmail.com> wrote:

> Do you have one contour for each Z slice?  If so, then try removing
> the Extrude filter from your pipeline.
>
>
> On Tue, Mar 6, 2012 at 2:51 AM, Jothybasu Selvaraj <jothybasu at gmail.com>
> wrote:
> > Another point here,
> >
> > I am creating a vtkPolyData for each contour and then adding it to the
> > vtkAppendPolydataFilter, then the output of vtkAppenPolydataFilter is
> set as
> > input to vtkPolydataToImageStencil.
> >
> > Could this make any difference?
> >
> > Thanks
> >
> > Jothy
> >
> >
> > On Mon, Mar 5, 2012 at 7:49 PM, Jothybasu Selvaraj <jothybasu at gmail.com>
> > wrote:
> >>
> >> No, it doesn't fix the problem.
> >>
> >> But it seems to work fine for contours with z-spacing in steps of 1mm.
> >>
> >> It is working well for a dataset with 3mm spacing but fails for 2.5 mm.
> >>
> >> Maybe I need to test it thoroughly. Can I use those cxx and .h from 5.6
> in
> >> 5.8, that would be a easy workaround.
> >>
> >> Thanks
> >>
> >> Jothy
> >>
> >>
> >> On Mon, Mar 5, 2012 at 4:01 PM, David Gobbi <david.gobbi at gmail.com>
> wrote:
> >>>
> >>> Hi Jothy,
> >>>
> >>> It underwent significant changes, but the only change I can think
> >>> of that might have affected your pipeline is the way that it does
> >>> rounding, it used to use a Floor() method that provided a small
> >>> tolerance even if you did SetTolerance(0).  Try calling
> >>> SetTolerance(1e-6) on your PolyDataToImageStencil object, it
> >>> might help.
> >>>
> >>>  - David
> >>>
> >>> On Mon, Mar 5, 2012 at 3:17 AM, Jothybasu Selvaraj <
> jothybasu at gmail.com>
> >>> wrote:
> >>> > Hi all,
> >>> >
> >>> > I was able to create a mesh using the following pipeline in 5.6 and
> it
> >>> > worked well
> >>> >
> >>> >
> >>> >
> vtkPolyDataToImageStencil->vtkLinearExtrusionFilter->vtkImageStencil->vtkDiscreteMarchingCubes
> >>> >
> >>> > Now, I have updated vtk to 5.8 and I am getting gaps in the mesh
> along
> >>> > the z
> >>> > axis. I am really puzzled, I have tried with different data sets as
> >>> > well.
> >>> >
> >>> > I have read somewhere that vtkPolyDataToImageStencil had some changes
> >>> > in
> >>> > 5.8, does it has anything to do with this problem, or am I doing
> >>> > anything wrong?
> >>> >
> >>> > I have contours of constant z-spacing.
> >>> >
> >>> > Any hints?
> >>> >
> >>> > Thanks
> >>> >
> >>> > --
> >>> > Jothy
> >>
> >>
> >>
> >>
> >> --
> >> Jothy
> >>
> >
> >
> >
> > --
> > Jothy
> >
>



-- 
Jothy
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