[vtk-developers] Polyhedral challenge

[David Gobbi]

Hi Casey,

I disabled point data because normals do not interpolate very well
across the cut surface.  My home version has a PassPointDataOn()
option, I'll push it when I have git access.

 David


On Mon, Apr 19, 2010 at 10:30 AM, Casey Goodlett
<casey.goodlett at kitware.com> wrote:
> Hi David,
>
> In further tests, I noticed that scalar point data is not passed through on
> the clipped poly data.   This seems to be fixed by uncommenting lines around
> 311-320 of vtkClipClosedSurface.cxx  in the latest version.
>
> Any reason this support is disabled?
>
> Thanks
>
> Casey
>
> On Thu, Apr 8, 2010 at 9:19 AM, David Gobbi <david.gobbi at gmail.com> wrote:
>>
>> Hi Casey,
>>
>> Try out the vtkClipClosedSurface that I just committed this morning.
>> I've made some changes to the code so that works with zero tolerance
>> now.
>>
>>  David
>>
>>
>> On Wed, Apr 7, 2010 at 12:38 PM, Casey Goodlett
>> <casey.goodlett at kitware.com> wrote:
>> > Hi David,
>> >
>> > I tested this filter, and it seems very nice.  Thanks for adding this.
>> >
>> > In my test, I also ran into the problem with not getting watertight
>> > outputs
>> > despite having watertight inputs.  I was able to fix this, at least for
>> > my
>> > cases, by setting the tolerance to zero in the point locator on line
>> > 309.  I
>> > think because I have very narrow triangles near the clipping surface
>> > some
>> > points are getting merged by the point locator and the resulting cap
>> > polygon
>> > ends up with a small hole.
>> >
>> > Any reason I should not be doing that?  Should the locator have a zero
>> > tolerance, or could we set a user controllable tolerance to the class?
>> >
>> > Thanks
>> >
>> > Casey Goodlett
>> >
>> > On Tue, Mar 30, 2010 at 9:16 AM, David Gobbi <david.gobbi at gmail.com>
>> > wrote:
>> >>
>> >> Hi Will,
>> >>
>> >> The vtkClipClosedSurface filter is in VTK cvs now. I've put together a
>> >> wiki page here:
>> >> http://www.vtk.org/Wiki/VTK/Closed_Surface_Clipping
>> >> The test is Graphics/Testing/Tcl/TestClipClosedSurface.tcl
>> >>
>> >>  David
>> >>
>> >>
>> >> On Wed, Mar 24, 2010 at 1:20 PM, Will Schroeder
>> >> <will.schroeder at kitware.com> wrote:
>> >> > David-
>> >> > This is good timing. Hua has been looking into the problem too. We
>> >> > came
>> >> > up
>> >> > with an initial, very limited solution and it will be good to have a
>> >> > more
>> >> > thorough approach. We are looking forward to seeing what you did.
>> >> > I'm curious, did you create a filter to do this? How did you
>> >> > implement
>> >> > it in
>> >> > VTK....
>> >> > Will
>> >> >
>> >> > On Wed, Mar 24, 2010 at 2:39 PM, David Gobbi <david.gobbi at gmail.com>
>> >> > wrote:
>> >> >>
>> >> >> Hi Will,
>> >> >>
>> >> >> I've finally completed my code for clipping closed polydata shapes
>> >> >> and
>> >> >> creating new "cap" polygons so that the result is also a closed
>> >> >> polydata.  The solution was more complicated than I originally
>> >> >> thought.  After the branch I'll commit it to VTK.
>> >> >>
>> >> >>   David
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>> >
>
>