[vtkusers] Rapid access to scalar data in vtkImageData

[Martijn Steenwijk]

You might be looking for an iterator, something like this:

reader->Update();

ImagePointer img = reader->GetOutput();
ImageIteratorType img_it(img, img->GetLargestPossibleRegion() );
for(img_it.GoToBegin(); !img_it.IsAtEnd(); ++img_it){
    double value = img_it.Get();
}

Best,
Martijn




On Mon, Oct 10, 2011 at 4:00 PM, Jothy <jothybasu at gmail.com> wrote:

> Hi all,
>
> I need to access the scalar values in a vtkImageData at a huge list of
> (random) points.
>
> Currentlt I ma using imgData->GetScalarComponentAsDouble(x,y,z,0).
>
> But it is slow. This is the key step in the function I will be using. Is
> there any other way to access it rapidly, may be with the pointer to scalar
> values?
>
> I need to copy the values to a std::vector.
>
> Any suggestions?
>
> Thanks
>
> Jothy
>
>
>
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