[vtk-developers] Marking data modified

[Berk Geveci]

I agree with David.

On Mon, Aug 15, 2016 at 12:54 PM, David Cole via vtk-developers <
vtk-developers at vtk.org> wrote:

> I don't specifically know the answer to this one, but in general,
> these sorts of things are on purpose for performance in VTK.
>
> If you want to replace 100 (or even more) cells, you'd want
> ReplaceCell NOT to call Modified, and just do it once at the end of
> your bulk replacement. I'd be surprised if somebody chimed in and
> contradicted this... so I would think just fixing the docs is the
> right way to go here.
>
>
> HTH,
> David C.
>
>
> On Mon, Aug 15, 2016 at 11:59 AM, Shawn Waldon <shawn.waldon at kitware.com>
> wrote:
> > Hi all,
> >
> > I have been tracking down a bug in the vtkBoxRepresentation where the
> > selected face never updated.  The issue was that the widget was calling
> > ReplaceCell on the vtkCellArray for the selected face polydata, but never
> > calling Modified() on the cell array (though it did call Modified() on
> the
> > polydata).  With the new OpenGL backend this matters.  The documentation
> for
> > ReplaceCell doesn't say that you have to do this afterward and the
> writer of
> > vtkBoxRepresentation used that documentation.
> >
> > So my question is this: why doesn't ReplaceCell mark the cell array as
> > modified? Is this a bug or on purpose for performance reasons?  I will
> > update the docs or fix ReplaceCell once I know which is wrong.
> >
> > Thank you,
> > Shawn
> >
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