[Rtk-users] Regarding rtk::ProjectionsReader

[Simon Rit]

Dear Amarnath,
GenerateData exists, see
http://www.openrtk.org/Doxygen/classrtk_1_1ProjectionsReader-members.html
This is ITK's internal machinery. When you call Update, it will call
itk::DataObject::Update(). This will call UpdateOutputInformation,
PropagateRequestedRegion and UpdateOutputData. The latter will call
UpdateOutputData in ImageSource which will eventually call GenerateData.
See ITK doc for more info.
Cheers,
Simon

On Mon, Jan 28, 2019 at 12:39 PM Andreas Andersen <andreasga22 at gmail.com>
wrote:

> Yes, as far as I remember:
> Update calls Generate on all filters (a reader is also a filter) in the
> pipeline.
> UpdateOutputInformation calls GenerateOutputInformation, which might be
> useful if you need properties of an image without reading the actual data,
> yet.
>
> Best regards
> Andreas
>
> On Mon, 28 Jan 2019, 11:45 Amarnath S <amarnaths161 at gmail.com wrote:
>
>> Hi,
>>
>>      I am using a rtk::ProjectionsReader as follows:
>>
>> typedef float OutputPixelType;
>> const unsigned int Dimension = 3;
>> typedef itk::Image< OutputPixelType, Dimension > OutputImageType;
>>
>> rtk::ProjectionsReader<OutputImageType>::Pointer projReader;
>> projReader = rtk::ProjectionsReader<OutputImageType>::New();
>> projReader->SetFileNames(fileNames); // filenames is defined and set
>> earlier
>>
>> Now, according to this page
>> http://www.openrtk.org/Doxygen/classrtk_1_1ProjectionsReader.html,
>> this class has a GenerateData() method, which does the real work. In the
>> GitHub rtk-master downloaded last week, this method does not seem to be
>> present. There is only one method name beginning with Generate..., and it
>> is GenerateOutputInformation(). What is the new method name for
>> GenerateData(). If it cannot be called directly, how else is it to be
>> invoked? Will calling of Update() internally call GenerateData()?
>>
>> Thanks and regards
>> - Amarnath
>>
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