[vtkusers] vtkActor2D problem transparence/opacity

[David Lonie]

On Wed, Aug 10, 2016 at 2:49 AM, AlexUtrobin <AlexUtrobin at yandex.ru> wrote:
> Hello! I use vtkScalarBarActor and vtkTextActor, they are not bright and
> clear. I think it is a problem with all vtkActor2D. Below is the code and
> the picture demonstrate the problem. Please, tell me how to solve the
> problem.
>
>         Java and VTK 7.0.
>
>         vtkRenderWindowPanel mRenderWindowPanel1 = new
> vtkRenderWindowPanel();
>         mRenderWindowPanel1.GetRenderer().SetBackground(1, 1, 1);//White
>         mRenderWindowPanel1.GetRenderer().ResetCamera();
>         mRenderWindowPanel1.GetRenderWindow().PointSmoothingOn();
>         mRenderWindowPanel1.GetRenderWindow().LineSmoothingOn();
>         mRenderWindowPanel1.GetRenderWindow().PolygonSmoothingOn();
>         mRenderWindowPanel1.setSize(jPanel1.getSize());
>         jPanel1.add(mRenderWindowPanel1);
>
>         vtkTextActor mActorTitle = new vtkTextActor();
>         mActorTitle.GetTextProperty().SetFontFamily(4); //4-Шрифт из файла
>         mActorTitle.GetTextProperty().SetFontFile("font.ttf");
>         mActorTitle.GetTextProperty().SetFontSize(SizeTitle);
>         try {
>             mActorTitle.SetInput(new String(title.getBytes("UTF-8")));
>         } catch (UnsupportedEncodingException ex) {
>             Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null,
> ex);
>         }
>         mActorTitle.SetDisplayPosition(5,
> jPanel1.getSize().height-SizeTitle-6);
>         mActorTitle.GetTextProperty().SetColor(0.0, 0.0, 0.0);
>         mRenderWindowPanel1.GetRenderer().AddActor(mActorTitle);

The code looks fine to me, I'm not sure why the text is coming out
grey. A few ideas that might help track the issue down:

1) Print out the color and opacity properties in the vtkTextPropery
objects to verify them. Maybe there's a surprise in there.
2) Try turning off the point/line/polygon smoothing and see if that's
somehow interacting with the rendering.
3) Try using one of the standard fonts bundled with VTK (e.g.
SetFontFamilyToTimes() or similar)).

Dave