[vtkusers] Get ith ScalarComponent from an Iterator

[Martijn de Greef]

Hello,

I'm writing my own filter that does a matrix (linear mapping) vector
multiplication for every voxel in the data set. I adapted a filter derived
from the vtkThreadedImageAlgorithm (vtkImageShiftScale). Now this filter
uses an ImageIterator and it it is not clear to me how I can get the ith
component for every voxel. Should I use a certain offset or can I get i,j,k
and use the GetScalarComponentAsFloat function on the vtkImageData object
inData?

Thank you,

Martijn
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