Please, post comments directly on the associated VTK post: https://discourse.vtk.org/t/proposal-to-add-orientation-to-vtkimagedata-feedback-wanted/120
For reference, the VTK post was created based on the Slicer wiki Labs page found here originally written by @lassoan with input from @jcfr and later updated based on comments from @ken-martin , @demarle , @berkgeveci , @lisa-avila and @jcfr.