[vtkusers] about minimizing memory usage

[Lic. José M. Rodriguez Bacallao]

so, right now, the only solution is to use one reader per file and
concatenate they results as needed?

On 3/11/11, David Gobbi <david.gobbi at gmail.com> wrote:
> 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
>> -----------------------------------------------------------------
>>
>


-- 
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
-----------------------------------------------------------------