3D plane trim - How to:
Usually, such patterns are defined with a dialogue, but sometimes it is easier to get them directly from the transition [or cylinder]
and use a virtual plane to make the 'cuts'. Just click the 3D object and afterwards click the 3 points that define the cutting plane.
Note, that these points [to define a valid plane] shall not be coincident nor aligned.
After starting LITIO2, and picking the 3D object and defining the 3 valid points, you get the cut 3D object and its development,
and you also get the 3D cutting path [a.k.a., the lid or partition wall]. Then, align it into the Z=0 plane, and you can get your cover or bottom plate of a tank, or its partition walls.
Note: This pattern does not work with AutoCAD 3D solids.
This is as easy as making 4 clicks [1 for the 3D object and 3 for the plane-defining points]!.