[vtkusers] VTKboolean smoothes the results! Any other libraries for boolean operation on polydata?

[Cory Quammen]

There shouldn't be any geometry smoothing going on in this filter. Can you
verify that the geometry has changed in the smoothed version?

This is speculation, but one possibility is that the surface normals in
your original surface come from a gradient computation in the volume from
which the surface was extracted and noise in the volume result in the bumpy
appearance. You can check this by applying the vtkPolyDataNormals filter to
your original surface and looking at the result.

HTH,
Cory

On Mon, Jul 17, 2017 at 10:21 AM, Majid Mohammad sadeghi <
majid.msadeghi at yahoo.com> wrote:

> Dear Cory,
>
> Thanks for the reply, I set the actors property to  SetInterpolationToFlat
> (); as you said, but the result is the same I put a picture before and
> after boolean operation here. Any suggestion? Are you familier with any
> other library? Current boolean operation takes about 150 seconds on my
> system, do you think this is normal?
>
> [image: Inline image]
>
>
>
>
> On Monday, July 17, 2017, 6:00:50 PM GMT+3, Cory Quammen <
> cory.quammen at kitware.com> wrote:
>
>
> What do you mean by smooth? The lighting is smooth? I think the filter
> may be adding surface normals, in which case any actor for the data
> will turn on Gouraud shading (or maybe Phong) by default, which will
> make your surface look smooth. You can turn off smooth lighting as
> shown in this example:
>
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/FlatShading
>
> On Mon, Jul 17, 2017 at 9:49 AM, Majid Mohammad sadeghi via vtkusers
> <vtkusers at vtk.org> wrote:
> > Hi everyone,
> >
> > I am using vtkBooleanOperationPolyDataFilter, and it works fine except
> after
> > the operation it smoothes the polydata, which I dont want. Is there a
> way to
> > stop that? Or is there another library for boolean operations on
> polydata?
> >
> > Thanks.
> >
> >
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>
>
> --
> Cory Quammen
> Staff R&D Engineer
> Kitware, Inc.
>
>


-- 
Cory Quammen
Staff R&D Engineer
Kitware, Inc.
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