[vtkusers] ShallowCopy in vtk 7.0 works correct?

[Cory Quammen]

Daniel,

Thanks for sharing the code sample. You are using different actors for
different renderers, which is good. But the shallow copy sets the same
mapper for each of the different actors. This should be fine within the
same renderer, but using the same mapper in different renders is not
supported. The reason is because each mapper has some OpenGL state
associated with the context in one of the renderers, and that state is not
valid in the other renderers.

It likely worked in the first OpenGL backend by sheer luck.

HTH,
Cory



On Tue, Feb 9, 2016 at 8:12 AM, -Daniel- <ich_daniel at habmalnefrage.de>
wrote:

> Hi,
>
> Now I try a new compilation and set VTK_RENDERING_BACKEND to OpenGL. It
> works!
> Why not with OpenGL2?
>
> approximate example - code snippet:  /
> // I create three vtkActors like...
> vtkLineSource lineX = new vtkLineSource();
>   lineX.SetPoint1(50, 0, 0);
>   lineX.SetPoint2(150, 0, 0);
> vtkActor lineXActor = setLine(lineX);   // separate method:
> vtkLineSource->vtkPolyDataMapper->vtkActor
>   lineXActor.GetProperty().SetColor(1, 0, 0);
>
> // copy of vtkActor
> vtkActor copyLineXActor = new vtkActor();
>   copyLineXActor.ShallowCopy(lineXActor);
>   copyLineXActor.VisibilityOn();
>
> // add actors to different renderer (  vtkPanel().getRenderer()  )
> // -> renderer1.AddActor(lineXActor);
> // -> renderer2.AddActor2D(copyLineXActor);
> /
> The vtkActor's are not visible at the same time. (By using OpenGL2 in the
> VTK_Rendering_Backend settings)
>
>
>
>
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-- 
Cory Quammen
R&D Engineer
Kitware, Inc.
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