[vtkusers] re-using allocated memory in image algorithm

[David Gobbi]

Hi Maarten,

The VTK image algorithms automatically reuse their memory unless the
data type or the size changes.  For more info, look at the code for
AllocateScalars in vtkImageData.cxx.  Also, I recommend printing out
the memory address after each Execute so that you can verify that it
doesn't change.

 - David


On Fri, Aug 22, 2014 at 8:04 AM, Maarten Beek via vtkusers
<vtkusers at vtk.org> wrote:
> Hi all,
>
> Is there a way to preserve the allocate memory of the put of an image
> algorithm?
>
> Looking at the source code, I have the feeling that algorithms in vtk
> allocate memory for their output each time ExecuteData() is called. I
> created an image algorithm that updates almost continuously, but the image
> size doesn't change. So once the output is created and memory is allocated,
> I could just keep using this output (just calling output->Modified() after
> the data in the exiting memory is replaced). How would I do this?
>
> Thanks - Maarten