[vtkusers] Please help me: How get pixel data after Render()

[Randall Hand]

to get the screen image, you can use vtkWindowToImageFilter.. that'll turn 
the screen display into a 2d vtkImageData object that you can pass to other 
VTK filters (or in my case, vtkPNGWriter).

http://www.vtk.org/doc/nightly/html/classvtkWindowToImageFilter.html



On 6/8/05, Renaud Isabelle <renauisa at yahoo.fr> wrote:
> 
> I'm got really *crazy*. I don't manage to use *double buffering* in order 
> to *avoid flickering* on screen.
>  I'm using *ImageSliceViewer* *to render a 2D slice of my 3D image on 
> screen*. It works well without double buffering except for flickering on 
> screen.
>  I have already use double buffering in MFC and I have a class CMemDC that 
> works fine to use memory buffering. 
>  *-> All I need is a method to get the pixel data of my 2D slice displayed 
> on screen*.Then I can use it to create a DIB Bitmap from what is rendered 
> off screen. 
>  I found the example of rendering in MFC and I tried the series of 
> instructions:
>  *this->window->SetupMemoryRendering(x,y,hdc);*
> *this->window->Render();*
> *StretchBlt(dc,0,0,x,y,memDC,0,0,x,y,SRCCOPY);*
> *this->window->ResumeScreenRendering();*
>  but all is displayed is a *white *page. Especially because during 
> process, *unsigned char* MemoryData* should be NULL.
>  Please help me. 
>    
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-- 
Randall Hand
http://www.yeraze.com
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