[vtkusers] Visualize a volume slice on a 3D plane (the acquisition plane of the images)

[Eva Monclús]

On 27/06/2018 16:12, Sankhesh Jhaveri wrote:
>
> You should be able to get the output of the mapper as vtkImageData and 
> then use GetScalarPointer() to access the raw data.
>
I have tried to bind the vtkImageData as the InputData of the 
vtkTexture, using:
             vtkImageActor *saggital;
             .........
             vtkImageData *image_data = sagittal->GetMapper()->GetInput();
              texture->SetInputData(image_data);

but I get the following openGL error:

    /ERROR: In
    D:\workspace.64\VTK-7.0.0\Rendering\OpenGL2\vtkOpenGLTexture.cxx,
    line 224/
    /vtkOpenGLTexture (000001EAAB506E60): 3D texture maps currently are
    not supported!/

I know that my vtkImageData is a 3D volume data but I hope that because 
the vtkImageActor is just rendering a 2D slice of the volume dataset, 
there was a way of obtaining it.

Thanks in advance,
     Eva


> ​
>
> On Wed, Jun 27, 2018 at 9:49 AM Eva Monclús <emonclus at cs.upc.edu 
> <mailto:emonclus at cs.upc.edu>> wrote:
>
>     Thanks a lot for the quickly answer, but my problem is that I want
>     to use the output of the vtkImageActor in a different graphic
>     object (another 3D plane) and I do not know how to manage it.
>
>     In very, very technical words, I want to get access to the
>     unsigned char * that it is being rendering using the vtkImageActor.
>
>     Thanks in advance,
>
>         Eva
>
>
>
>     On 27/06/2018 15:22, Sankhesh Jhaveri wrote:
>>
>>     Hi Eva,
>>
>>     |vtkImageActor| is a 2D textured plane in a 3D space. Make sure
>>     that you use the |vtkImageMapper3D| (default mapper) with it.
>>     If you’re just looking for 3D interaction with the actor, use an
>>     interactor style like |vtkInteractorStyleTrackballCamera|.
>>
>>     Hope that helps.
>>
>>     Thanks,
>>     Sankhesh
>>
>>     ​
>>
>>     On Wed, Jun 27, 2018 at 9:17 AM Eva Monclús <emonclus at cs.upc.edu
>>     <mailto:emonclus at cs.upc.edu>> wrote:
>>
>>         Hello everyone,
>>
>>         I'm working with a volume dataset (temporal Dicom serie) and
>>         I´m able to visualize the  slices using the following vtk C++
>>         classes:
>>
>>           * vtkImageData: represents the volume dataset
>>           * vtkImageMapToColors: I use this class to define the
>>             transfer function to be used in the rendering
>>           * vtkImageActor: I use this class to render a specific
>>             slice of the volume dataset
>>
>>         Until here everything it is fine. I can render the slice I
>>         want using the classes before mentioned changing the
>>         SetDisplayExtent of the vtkImageActor.
>>
>>         Now I want to visualize the output of my vtkImageActor as a
>>         2D texture in a free 3D plane. Then, I consider to have the
>>         following classes:
>>
>>           *  I use a vtkPlaneSource to define the  3D plane:
>>             orientation and position
>>           * a vtkTexture that has to be attached to the
>>             vtkPlaneSource. My problem comes out with the definition
>>             of the SetInputConnection of the vtkTexture. I want to
>>             define the  image as the output of the vtkImageActor.
>>             But  I do not get it.
>>
>>         I am successful in visualizing the vtkPlane in black  color
>>         (due to the texture is not well defined) unfortunately, I
>>         can't get it to work properly  with a texture of a specific
>>         slice of the volume dataset. I have tried different ways of
>>         assigning the SetInputConnection of the vtkTexture using the
>>         vtkImageActor, but none of them worked well.
>>
>>         Any help will be welcome.  Thank you very much in advance,
>>
>>            Eva
>>
>>
>>
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>>     -- 
>>
>>
>>               Sankhesh Jhaveri
>>
>>
>>                 /Sr. Research & Development Engineer/ | Kitware
>>                 <http://www.kitware.com/> | (518) 881-4417
>>                 <tel:%28518%29%20881-4417>
>>
>>     ​
>
> -- 
>
>
>           Sankhesh Jhaveri
>
>
>             /Sr. Research & Development Engineer/ | Kitware
>             <http://www.kitware.com/> | (518) 881-4417
>
> ​

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