[vtkusers] GetCenter of vtkImageData - a possible bug?

[chasank]

center[i] = origin[i] + ((dimensions[i] / 2) * spacing[i]);
In above calculation, dimensions[i]/2 is equal to center slice number. So
instead of using std::floor(dimensions[i]/2.0f) to get center slice number,
I chose to use dimensions[i]/2 which gives the same result.



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