[vtkusers] scaling issue of vtkrenderwindow in QVTKWidget for Mac in High Resolution mode

[Hongzhi Lan]

Hi all,


I recently tested the example RenderWindowNoUiFile from VTK in Mac ,and found the renderwindow only occupies the left-bottom quarter of the QVTKWidget (shown in the attached image). I know someone mentioned this issue and you can avoid it by using "Open in Low Resolution". But with a very good high(retina) resolution mac computer, you can only open a Qt-vtk-dependent application in "Low Resolution" and get a blurry GUI, which seems not ok to users who are using high resolution mac computer.  I was wondering if vtk developers will fix this issue in the nearest future.


By doing some web search, I know the reason is: In Hidpi (such as retina resolution in macbook pro), 1x1 pixel becomes 2x2 pixels. Qt can recognize it, so the widget size is right, but vtk can't, so vtkRenderWindow only occupies a quarter of the widget size. I tried to modify the source code of QVTKWidget class by doubling the size of vtkRenderingWindow in the QVTKWidget, but it did't change anything. So it's not so straightforward as I expected.  Can anyone give me some suggestion about how to fix the issue and what classes I need to modify?


Thanks a lot!

Hongzhi
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