Dear Jérome,
still experimenting on luatex, below is a test file of my own that uses the 32 possibilities. Here is the output with hboxes and vboxes hilighted respectively in blue and orange Before I work on the vertical boxes, could you confirm that it is the expected behaviour ? In particular, I find it very weird that sometimes the text is outside the box that contains it.
ah, you do it the encyclopedic way (i tried the same), maybe expecting that all directions are working. In fact the h/vpacker is currently only geared for a small subset, only for the directions that are demanded by users. I tried to get some consistency into the backend for all 32 output directions, but i don't know how far they make sense, and i didn't touch the packers (remaining consistent with aleph --- which also behaves funny for many of the directions). As it seems there is no user nor test font for most cases, it's also unclear how the packers should behave, uncharted territory.
For example on page 3, the rectangle filled with light blue corresponds to "\hbox to 5cm" below which box direction is "dir_TL_". Inside, we have the "vbox" which box direction is "dir_LT_".
I'll check more from home... Regards, Hartmut -- GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT! Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01