[vtkusers] about minimizing memory usage

[David Gobbi]

Usually the extents are set automatically by the pipeline.  So for
example you can use vtkImageClip after your reader to set the
extent that will be read.  But usually you would not even do that,
because vtkImageMapper and vtkImageActor will automatically
back-propagate the UpdateExtent that they require through the
chain of filters in the pipeline.

 - David


On Fri, Mar 11, 2011 at 3:03 PM, Lic. José M. Rodriguez Bacallao
<jmrbcu at gmail.com> wrote:
> and what about "Extents", how to set an extent to the image reader?
>
> On Fri, Mar 11, 2011 at 4:57 PM, David Gobbi <david.gobbi at gmail.com> wrote:
>> In general, VTK does not support sliding window cacheing like
>> you are describing.  It will unload the three images and then
>> load three new images (where two of the images were ones that
>> had previously been loaded).  You would have to write your own
>> VTK class to implement a cacheing system like the one that
>> you want.
>>
>>  - David
>>
>> On Fri, Mar 11, 2011 at 11:21 AM, Lic. José M. Rodriguez Bacallao
>> <jmrbcu at gmail.com> wrote:
>>> hi folks, I am writing a simple dicom viewer with vtk and gdcm. I am
>>> using vtkGDCMImageReader to load my files in conjunction with
>>> IPPSorter. For minimizing memory usage I need to have in memory just
>>> three images from for example, 200, when the user need to see the
>>> slice 3 + 1, then load the next slice and unload the old first loaded
>>> slice from the old 3 slices and so on. Is something like a dynamically
>>> moving update extent. How do I achieve that in vtk?.
>>>
>>> --
>>> Lic. José M. Rodriguez Bacallao
>>> Centro de Biofisica Medica
>>> -----------------------------------------------------------------
>>> Todos somos muy ignorantes, lo que ocurre es que no todos ignoramos lo mismo.
>>>
>>> Recuerda: El arca de Noe fue construida por aficionados, el titanic
>>> por profesionales
>>> -----------------------------------------------------------------
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>>
>
>
>
> --
> Lic. José M. Rodriguez Bacallao
> Centro de Biofisica Medica
> -----------------------------------------------------------------
> Todos somos muy ignorantes, lo que ocurre es que no todos ignoramos lo mismo.
>
> Recuerda: El arca de Noe fue construida por aficionados, el titanic
> por profesionales
> -----------------------------------------------------------------
>