[vtkusers] Problem with polydatas sharing vtkPoints in vtk8

[Tiago Nobrega]

Hi Sean,

Thanks for the reply. I'll try bisecting once I get some free time, for now
I suppose I'll just stay with 7.1.
I've also reported this bug on Gitlab:
https://gitlab.kitware.com/vtk/vtk/issues/17508 . I'll update the report if
I get any progress.

Tiago

On Wed, Jan 30, 2019 at 3:20 PM Sean McBride <sean at rogue-research.com>
wrote:

> On Thu, 24 Jan 2019 10:28:07 -0200, Tiago Nobrega said:
>
> >I'm trying to update from vtk 7.0 and I'm having an issue with a
> particular
> >setup of polydatas. In my case I have a single vtkPoints that is shared by
> >multiple vtkPolydatas, where each polydata renders a different set of
> >cells. I can't get the rendering to show more than one polydata at a time
> >in vtk 8.0 and up, but it works as expected in vtk 7.1. In all cases I am
> >using the new OpenGL2 backend.
> >
> >I created a minimal example that reproduces the issue for me:
> >https://gist.github.com/tigarmo/c90ff07a1b63bbcf396fa4aaf1e824a9 . It
> tries
> >to show 2 quads, where each quad is a cell in a different polydata, but
> >both polydatas share the same vtkPoints. This shows 2 quads as expected
> (by
> >me) in vtk 7.1 but only 1 quad in vtk 8.0.1, 8.1.0 and 8.1.1. A surprising
> >detail is that which quad is shown varies depending on the run. Sometimes
> >it's the left one, sometimes the right one.
> >
> >Does anyone have any suggestions? Is this a bug? Could it be related to
> >improvements in VBO caching that I saw in 8.0's changelog?
>
> Tiago,
>
> Since no one seems to have a better answer for you, what you could do is
> use 'git bisect' to find exactly which commit between 7.1 and 8.0 caused
> this change in behaviour.  The commit message will hopefully shed light on
> the cause and whether it's a bug or not.
>
> Cheers,
>
> --
> ____________________________________________________________
> Sean McBride, B. Eng                 sean at rogue-research.com
> Rogue Research                        www.rogue-research.com
> Mac Software Developer              Montréal, Québec, Canada
>
>
>
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