[vtkusers] How to get native scalar pointer from a vtkImageReader?

[Amy Squillacote]

Hi James,

First you'll need to manually call Update() on your instance of 
vtkImageReader. Then do something similar to the code shown below.

vtkImageReader *reader = vtkImageReader::New();
...
reader->Update();
vtkImageData *output = reader->GetOutput();
void *ptr = output->GetScalarPointer();

You can find out the scalar type of the scalars in the vtkImageData 
using the GetScalarType() or GetScalarTypeAsString() methods. Then you 
can cast the pointer to the raw data to the correct type.

- Amy

James Zhou wrote:
> Hi,
>
> I read the 3D data into the vtk pipeline using  vtkImageReader. Now I 
> want to get the native scalar pointer (i.e. the pointer that points to 
> the raw data), could you please give me any information on how to do 
> this?
>
> Thanks!
>
> James
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-- 
Amy Squillacote
Kitware, Inc.
28 Corporate Drive
Clifton Park, NY 12065
Phone: (518) 371-3971 x106