Follow-up Comment #12, bug #21735 (project mypaint):
Thanks Martin! Strange that your tilt is inaccurate. When you say "very
flat" are you actually tilting the pen to nearly 90 degrees? It won't
register any tilt beyond 60 degrees. I also noticed that you have to keep the
nib in contact with the pad all the time or else the values will go crazy. If
you check out that linuxwacom thread I posted earlier they talk about the
conundrum of QT and GTK-- QT isn't doing the tilt calc either, Krita is. GTK
maps everything to -1 thru 1 but doesn't actually tell anyone the max tilt is
60 degrees. QT screws up by just assuming 60 degrees is the maximum tilt
(although this works out better in reality). The kernel folks seem to be
limiting all pens to 60 degrees of tilt for this reason, which seems a shame
since there are some tablets that support 90 degrees of tilt. So nothing
seems to be ideal. You could almost argue the wacom kernel folks should
calculate tilt... or maybe that QT and GTK shouldn't even do any massaging of
the input data.
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