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

[Amy Squillacote]

Use the vtkImageData::GetScalarPointer method.

- Amy

At 03:16 PM 6/8/2005, Renaud Isabelle wrote:
>Hi,
>
>thanks for your reply. I check out your filter. This could be a good idea. 
>All I will have to do is:
>
># Will render in memory.
>renWin->OffScreenRenderingOn();
>renWin->Render();
>
>vtkWindowToImageFilter w2if;
>w2if->SetInput(renWin);
>
>Ok. And I will have a 2D vtkImageData object.
>
>But then, how can I have to pointer of the pixel data of this vtkImageData 
>object?
>
>Isa
>
>
>
>
>Randall Hand <randall.hand at gmail.com> a écrit :
>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>http://www.vtk.org/doc/nightly/html/classvtkWindowToImageFilter.html
>
>
>
>On 6/8/05, Renaud Isabelle <<mailto:renauisa at yahoo.fr>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/>http://www.yeraze.com
>
>
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