[vtkusers] VTK equivalent of Paraview's Crinkle Clip option?

[Berk Geveci]

ParaView uses the vtkExtractGeometry filter under the covers for the
crinkle option.

Best,
-berk

On Fri, Apr 22, 2016 at 12:42 AM, Evan Kao <tossin at gmail.com> wrote:

> Hey all,
>
> Is there a VTK equivalent of Paraview's Crinkle Clip option?
>
> Some background: I'm want to interactively edit the point data array of
> some vtkDataSet.  I'm trying to do the following pipeline:
>
>    - vtkIdsFilter is applied to a geometry generate an Ids array
>    - User uses (box, plane, sphere) widget to roughly specify an implicit
>    function encompassing part of the geometry
>    - The implicit function is used to clip the data set (inside out) and
>    the remaining point Ids are obtained
>    - The array data for those specific point Ids are set to a specific
>    value
>
> However, for some reason the various clippers will remove the generated
> point Ids array in both VTK and Paraview.  It makes some sense since new
> points are generated by the clip, but I think it would be more convenient
> if the array wasn't thrown out entirely.
>
> in Paraview, this issue can be avoided if the Crinkle Clip option is
> turned on.  But I couldn't find an equivalent option in any of VTK's
> various clippers.
>
> I can get around this by basically casting the Idsarray from vtkIdType to
> Int before clipping, but that seems pretty inelegant.  A crinkle clip would
> be more appropriate.
>
> I'm also open to other ideas for grabbing the point Ids without using a
> clipper.
>
> Thanks,
> Evan Kao
>
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