Depending on what VTK version you are using and what features are needed, it may be enough to change the image direction in the vtkImageData or you have to use vtkImageReslice/vtkImagePermute.
Depending on what VTK version you are using and what features are needed, it may be enough to change the image direction in the vtkImageData or you have to use vtkImageReslice/vtkImagePermute.