Steve Pieper

Thanks for the report - I noticed that too late for the release, but the current previews should be working. https://github.com/pieper/CompareVolumes/commit/cb755dda78f726cf9262aa4e1f75122c72a0df2f https://github.com/Slicer/Slicer/commit/8c92a12d6acecde092439981af70b1a27b6d2cf1

Do you have example data that could be used to test this? I'm not sure this would ever come up in practice since the tags are always in order and...

Maybe you are looking for a pure-python solution, but if you are just interested in processing data in an environment that is python-scriptable [SlicerRT](https://www.slicer.org/w/index.php/Documentation/Nightly/Extensions/SlicerRT) is an option.

Thanks for the pointer @sarthakpati - if that library suits your needs that's great. As the readme at that site says, there can be some very tricky special cases in...

@mauigna06 that's exactly what should happen. There's a reasonable performance overhead if the transform is applied as part of the ray tracing steps. I've done that before in my own...