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

[Andras Lasso]

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<mailto: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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Ken Martin PhD
Distinguished Engineer
Kitware Inc.
101 East Weaver Street
Carrboro, North Carolina
27510 USA
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