[vtkusers] Cannot disable vtkPolyDataMapper2D scalar visibility using VTK OpenGL2 backend

Tue Jul 10 09:54:01 EDT 2018

Thanks!, fixed in MR https://gitlab.kitware.com/vtk/vtk/merge_requests/4475

On Tue, Jul 10, 2018 at 12:10 AM, Andras Lasso <lasso at queensu.ca> wrote:

> Thanks a lot Ken for the quick response. The change that you described
> below fixed the issue!
>
>
>
> Andras
>
>
>
> *From:* Ken Martin <ken.martin at kitware.com>
> *Sent:* Monday, July 9, 2018 3:53 PM
> *To:* Andras Lasso <lasso at queensu.ca>
> *Cc:* vtkusers at vtk.org
> *Subject:* Re: [vtkusers] Cannot disable vtkPolyDataMapper2D scalar
> visibility using VTK OpenGL2 backend
>
>
>
> Sounds like a bug. Andras if you move line 568 from
> vtkOpenGLPolyDataMapper2D.cxx out of the if statement to line 563 does that
> solve the problem? Looking at the code I believe that is the correct fix.
>
>
>
> e.g. it should look like this
>
>
>
>   this->MapScalars(act->GetProperty()->GetOpacity());
>
>   this->HaveCellScalars = false;
>
>   if (this->ScalarVisibility)
>
>   {
>
>     // We must figure out how the scalars should be mapped to the polydata.
>
>     if ( (this->ScalarMode == VTK_SCALAR_MODE_USE_CELL_DATA ||
>
>           this->ScalarMode == VTK_SCALAR_MODE_USE_CELL_FIELD_DATA ||
>
>
>
>
>
>
>
> On Mon, Jul 9, 2018 at 12:33 PM, Andras Lasso <lasso at queensu.ca> wrote:
>
> Hi all,
>
>
>
> I try to render a polydata with a plain solid color using a 2D actor.
> However, it seems that with OpenGL2 rendering backend, if a polydata has
> scalars and rendered once with scalar visibility enabled, ScalarVisibility
> cannot be disabled anymore. The actor will always appear as colored. In
> some cases, the colors randomly flicker. See a very simple code snippet
> below to reproduce it.
>
>
>
> The same code works well (scalar visibility can be enabled/disabled) using
> VTK OpenGL1 backend. If I use 3D mapper and actor (vtkPolyDataMapper and
> vtk.vtkActor) then it works well using both VTK OpenGL1 and OpenGL2
> backends.
>
>
>
> Is this a known issue? Could somebody have a look?
>
>
>
> Thank you,
>
> Andras
>
>
>
>
>
> reader = vtk.vtkXMLPolyDataReader()
>
> reader.SetFileName("scalartest.vtp")
>
> mapper = vtk.vtkPolyDataMapper2D()
>
> mapper.SetInputConnection(reader.GetOutputPort())
>
> actor = vtk.vtkActor2D()
>
> actor.SetMapper(mapper)
>
> actor.SetPosition(150,150)
>
> ren = vtk.vtkRenderer()
>
> ren.AddActor(actor)
>
> renWin = vtk.vtkRenderWindow()
>
> renWin.AddRenderer(ren)
>
> renWin.Render()
>
> # actor appears in color here => OK
>
> mapper.SetScalarVisibility(False)
>
> renWin.Render()
>
> # actor appears in color here => ERROR (it should be white)
>
>
>
>
>
> Download link for scalartest.vtp sample data set (any other polydata with
> scalars should work):
>
> https://1drv.ms/u/s!Arm_AFxB9yqHtK1gHCIsGt0U62OTQg
> <https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2F1drv.ms%2Fu%2Fs!Arm_AFxB9yqHtK1gHCIsGt0U62OTQg&data=02%7C01%7Classo%40queensu.ca%7Ce06fabd733c540fd9c4a08d5e5d59008%7Cd61ecb3b38b142d582c4efb2838b925c%7C1%7C0%7C636667627766232634&sdata=qosMAzacqE779GLw69Pogi1Rayk%2B%2F%2FTX5tJ2SGm8VWs%3D&reserved=0>
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>
>
>
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> --
>
> Ken Martin PhD
>
> Distinguished Engineer
> Kitware Inc.
>
> 101 East Weaver Street
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-- 
Ken Martin PhD
Distinguished Engineer
Kitware Inc.
101 East Weaver Street
Carrboro, North Carolina
27510 USA

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