[vtkusers] QVTKRenderWindowInteractor distorted widget background problem + dot representation of spheres when rotating.

[Piotr Byzia]

Hi,

I'm using QVTKRenderWindowInteractor to embed VTK window within  
QMainWindow (using PyQt) and encountered a strange problem (see  
attachment or http://media.piotr.byzia.pl/vtk-distorted-widget.png)  
under Windows XP box  (VTK 5.4).

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This happens just after widget is launched.

widget = QVTKRenderWindowInteractor(self)
widget.setGeometry(QtCore.QRect(22, 42, 400, 427))
widget.GetRenderWindow().SetSize(400,427)

ren = vtk.vtkRenderer()
ren.SetBackground(0, 0, 0) # black


==================================

Another question is related to the change in representation from  
spheres to dots when rotating a set of actors (about 300 spheres). It  
differs from machine to machine but it occurs on most of them.  
Rotating is smooth and without switching to dots on more powerful  
machines, so I guess this has something to do with the 3D acceleration?

Is it a known behavior?
On what parameters / CPU / RAM / graphics cards does it depend on  
exactly?
How could I improve it with about 1500-2000 spheres-actors?

Regards,
Piotr Byzia