Thank you for your feedback. I perfectly know this way, as well as in 2D using the interaction in the cross, which is very useful, but it is very difficult to get a new volume oriented as a series .dicom or.NRRD. It is much more convenient in Horos.
It depend what you want to do, if it is just to oriente the 3D use the cross interaction to get the plane you want, then draw a plane, it is efficient.
