[vtk-developers] Polyhedral challenge

[David Gobbi]

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
>> _______________________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at
>> http://www.kitware.com/opensource/opensource.html
>>
>> Follow this link to subscribe/unsubscribe:
>> http://www.vtk.org/mailman/listinfo/vtk-developers
>>
>
>
>