[Insight-users] Re: [vtkusers] Please help me: How get pixel data after Render()

[Renaud Isabelle]

Exact. But why do I have to pass with another filter whereas that my pixel data is already saved in memory? 
 
Have someone already used vtkImageData->GetScalarPointer(x,y,slice). 
 
Maybe THIS could help me
 
Isa

Amy Squillacote <amy.squillacote at kitware.com> a écrit :
vtkWindowToImageFilter does not require you to render the image on-screen.  It only requires that you use a vtkRenderWindow, and by using vtkImageViewer, you are using a vtkRenderWindow.

- Amy

At 01:44 PM 6/8/2005, Renaud Isabelle wrote:
Hi,
 
I'm sorry but this is not what I'm looking for. I have no image on the screen. 
 
By using vtkImageActor I can display one slice of my 3D image. This will be rendered off screen.
 
All I want is retrieve the pixel data of this slice from memory to display it on .
 
Do you have another idea?
 
Thanks,
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 




   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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