[vtkusers] Displaying vtkPolyData while writing on it within Qt objects (QVTKWidget)

[Barth, Sebastian]

Hello Clint,

yes, I call Modified() and it's working, but that's not the problem. The point ist that Qt does not invoke the QTimer event while the mouse is moving. This is a Qt problem and I guess I have to use different threads to avoid this: One for the interface with the QVTKWidget and one for the QTimer which forces the manipulation of the vtkPolyData. I don't know if there is a better way.

For this I want to know if there are some things I have to know if I want to have access to one vtkPolyData from out two different threads (QThread). There are few informations about QThread and almost none about VTK at a multithreading point.

I hope someone can give me some instructions, because I know almost nothing about threads in this scope (VTK + Qt).

Thanks a lot

Sebastian

-----Ursprüngliche Nachricht-----
Von: vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] Im Auftrag von Clinton Stimpson
Gesendet: Freitag, 18. Juni 2010 22:23
An: vtkusers at vtk.org
Betreff: Re: [vtkusers] Displaying vtkPolyData while writing on it within Qt objects (QVTKWidget)

On Friday, June 18, 2010 09:22:42 am Barth, Sebastian wrote:
> Hello vtkusers,
> 
> my application uses the QVTKWidget with Qt 4.6.2 and VTK 5.6.0 as a part of
> it's window.
> 
> I have a 3D visualisation of a cluster of points stored in a vtkPolyData.
> On my Qt window I can start a QTimer whose timeout() signal is connected
> to a slot which manipulates the points in the vtkPolyData and updates the
> visualisation pipeline with QVTKWidget::update().
> 
> My vtkRendererWindow uses the default interactor style (trackball camera).
> 
> While moving the camera (mouse interaction) the QVTKWindow gets updated,
> but the vtkPolyData does not. This of course, is a Qt problem, but I want
> to know if I have to do anything special if I want to write on the
> vtkPolyData object from out another thread (QThread) while I'm moving the
> camera and displaying the current written Data. Maybe there is a simplier
> solution, I don't know!
> 
> It's the first time I work with VTK, QT and even threads and I appreciate
> every help!
> 

Are you calling Modifed() on the vtkPolyData after modifying its points?

Clint
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