[vtkusers] Reading DICOM using vtkImageActor

[Matias Montroull]

I ran into the same issue with 3D view and had to use this:
ren.ResetCameraClippingRange();
For some reason your view is outside the bounds then when you touch the
actor it then re renders the image and you can see it.

(It is in C# thought) not sure how would be in C++ but you can search
around for that method.


On Mon, Mar 31, 2014 at 1:18 PM, Sam Raby <rabysam28 at gmail.com> wrote:

> Here is the code without text formatting:
>
>  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();
>
>
> On Mon, Mar 31, 2014 at 11:11 AM, Sam Raby <rabysam28 at gmail.com> wrote:
>
>> 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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