[vtkusers] vtkImageImport

[Erik Türke]

On 03/29/2010 10:07 PM, David Gobbi wrote:
> On Mon, Mar 29, 2010 at 1:33 PM, Erik Türke<tuerke at cbs.mpg.de>  wrote:
>> On 03/29/2010 08:40 PM, David Gobbi wrote:
>>> On Mon, Mar 29, 2010 at 12:26 PM, Erik Türke<tuerke at cbs.mpg.de>    
>>> wrote:
>>>
>>>
>>>> Hi!
>>>>
>>>> Well, this should be part of an adapter...so the user should get a 
>>>> list
>>>> of
>>>> pointers to vtkImageData objects (i return a list since the adapter 
>>>> also
>>>> gets 4d data as input).
>>>> But it seems, this is not possible, so i have to return a list of
>>>> pointers
>>>> to vtkImageImport objects, what imho is a little odd for the user 
>>>> of the
>>>> adapter.
>>>>
>>> I don't understand what you are trying to say.  Can you give more 
>>> detail?
>>>
>>>    David
>>>
>> Hi
>>
>> I want to write an adapter which takes an image object of an own type 
>> and
>> returns a list of vtkImageData type pointers, like:
>>
>> data::ImageList imgList = isis::data::IOFactory::load("data.nii", "");
>>
>> or
>>
>> isis::data::ImageList imgList = isis::data::IOFactory::load("data.v", 
>> "");
>>
>> imgList is the image object of type own, which i want to transform 
>> into a
>> vtkImageData object, like
>>
>> std::list<vtkImageData*>  vtkList =
>> isis::adapter::VTKAdapter::makeVtkImageList(imgList.front());
>>
>> (do not be confused of the imgList.front()...this is an object of 
>> dimension
>> 4, so i want to return a list of 3d vtkdata)
>>
>> So, if someone for instance write an vtk image viewer which should 
>> support
>> the isis image type, he/she can use the VTKAdapter to transform my own
>> imagetype into a vtkImageData type and use it.
>>
>> But the way things are going i have to return vtkImageImport objects:
>>
>> std::list<vtkImageImport*>  vtkList =
>> isis::adapter::VTKAdapter::makeVtkImageList(imgList.front());
>>
>> which actually was not my goal.
>
> Well, I am not familiar with isis, but now I have an idea of what you
> are trying to do.
>
> First, note that when using STL containers with VTK objects, you must
> always use smart pointers:
>
>    std::vector<vtkSmartPointer<vtkImageData> >  imageDataVector;
>
> Smart pointers are the only way that the VTK garbage collector can
> track objects that are inside of STL containers.
>
>
> As for the rest, I really don't understand why you cannot make a list
> of vtkImageData objects.  Why not do something like this?
>
> For each 3D image:
>
> 1) create a vtkImageImport
> 2) set the vtkImageImport up for your data
> 3) call Update
> 4) use GetOutput() to get the vtkImageData
> 5) add the vtkImageData to a std:list<vtkSmartPointer<vtkImageData> >  
> container
> 6) call Delete on the vtkImageImport
> 7) repeat for the next 3D image
>
> I have used a similar technique for importing 4D image to VTK with no 
> problem.
>
>    David
Ahhh very thanks....i guess i was a little blockheaded :-)

I did not see the simple vtkImage = vtkImporter->GetOutput() command...

thanks a lot!!

cheers
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