[vtkusers] Reading DICOM using vtkImageActor

[Sam Raby]

Hi,

As mentioned, I am reading DICOM using vtkImageActor instead of
vtkImageReviewer2. I have a simple code below. The problem is that when I
run the code, the slice does not show up, unless I slightly manipulate the
window by mouse. Once I touch the window and move the mouse, the slice
shows up immediately. Would you let me know why this happens?

    vtkSmartPointer<vtkDICOMImageReader> reader =
vtkSmartPointer<vtkDICOMImageReader>::New();
    reader->SetDirectoryName("/home/DICOM_Dir");
    reader->Update();
    vtkSmartPointer<vtkImageActor> imageActor =
vtkSmartPointer<vtkImageActor>::New();
    imageActor->SetInputData(reader->GetOutput());

    imageMapper = vtkImageSliceMapper::SafeDownCast( imageActor->GetMapper() );
    imageMapper->SetSliceNumber(10);
    vtkSmartPointer<vtkRenderer> ren = vtkSmartPointer<vtkRenderer>::New();
    ren->AddActor(imageActor);
    ren->ResetCamera();

    vtkSmartPointer<vtkRenderWindow> renWin =
vtkSmartPointer<vtkRenderWindow>::New();
    renWin->AddRenderer(ren);

    vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor
= vtkSmartPointer<vtkRenderWindowInteractor>::New();
    vtkSmartPointer<vtkInteractorStyleTrackballCamera>
interactorImageStyle =
vtkSmartPointer<vtkInteractorStyleTrackballCamera>::New();

    renderWindowInteractor->SetInteractorStyle(interactorImageStyle);
    renWin->SetInteractor(renderWindowInteractor);
    renderWindowInteractor->SetRenderWindow(renWin);
    renderWindowInteractor->Initialize();
    renderWindowInteractor->Start();


Thanks.

-S



On Fri, Mar 21, 2014 at 12:57 AM, Sam Raby <rabysam28 at gmail.com> wrote:

> Thanks David. Adding SafeDownCast rectified the error, and I can now
> change the slice number using vtkImageSliceMapper object.
>
> I initially was going to change the slice number through vtkImageActor,
> but the method that is in charge (i.e. SetZSlice) appeared to be not
> working, as reported in the past on the link, and hence I thought to
> change the slice number via its mapper. Thanks for the help!
>
> http://www.paraview.org/Bug/bug_relationship_graph.php?
> bug_id=3661&graph=dependency
>
>
> -S
>
>
> On Wed, Mar 19, 2014 at 2:28 PM, David Gobbi <david.gobbi at gmail.com>wrote:
>
>> On Wed, Mar 19, 2014 at 12:59 PM, Sam Raby <rabysam28 at gmail.com> wrote:
>> > thanks for the feedback. I am following your solution as below:
>> >
>> > vtkImageSliceMapper* myMapper = myActor->GetMapper();
>> > myMapper->SetSliceNumber(sliceNum);
>> >
>> > However I am getting the following error:
>> >
>> > error: invalid conversion from 'vtkImageMapper3D*' to
>> 'vtkImageSliceMapper*'
>> > [-fpermissive]
>> >
>> > I was not sure how to address this. Am I missing something here?
>>
>> Oops, I guess it needs a cast.
>>
>> vtkImageSliceMapper* myMapper =
>>   vtkImageSliceMapper::SafeDownCast(myActor->GetMapper());
>>
>> Perhaps vtkImageActor should have a SetSliceNumber() and
>> SetOrientation() method itself, instead of these methods being just in
>> the mapper.
>>
>>   David
>>
>
>
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