[vtkusers] Rapid access to scalar data in vtkImageData

[Jothy]

There was some wrong type casting. works now!

Thanks

Jothy

On Wed, Oct 12, 2011 at 11:16 AM, Jothy <jothybasu at gmail.com> wrote:

> Hi David,
>
> With GetScalarPointer<x,y,z) I get the address.
>
> But I have to add to a std::vector<double>.
>
> I tried like this
>
> std::vector<double>result;
> double *pixel=static_cast<double*>(img->GetScalarPointer(x,y,z));
> result.push_back(pixel[0]);
>
> Its only pushing the address of the pointer, how to copy the value of the
> pointer?
>
> I have just started c++ and pointer seem to be useful but tricky!
>
> Thanks
>
> Jothy
>
>
> On Tue, Oct 11, 2011 at 9:17 PM, David Doria <daviddoria at gmail.com> wrote:
>
>> On Mon, Oct 10, 2011 at 11:41 AM, Martijn Steenwijk
>> <martijnsteenwijk at gmail.com> wrote:
>> > 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
>>
>> Martijn, this is the VTK list :)
>>
>> Jothy, I think you're looking for imageData->GetScalarPointer(). Then
>> you can access the data with normal pointer arithmetic.
>>
>> David
>>
>
>
>
> --
> Jothybasu K Selvaraj
> PhD Student
> University of Liverpool
> Liverpool,UK
>
>


-- 
Jothybasu K Selvaraj
PhD Student
University of Liverpool
Liverpool,UK
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