Has anybody thought about pens (ie wacom tablets)? These have 5 degrees
of freedom (most cannot distinguish rotation about the long axis of the
pen). There are also spaceballs with full 6 degrees of freedom.
One idea I remember from Irix was that all the analog controls were
1-dimensional. A mouse was actually 2 analog controls. This avoids the
need to define how many degrees of freedom a control has, instead it is
just N different controls. Quaternions are a problem though because the
4 numbers are not independent so there must be a way to get a set of
changes together.
Another idea was that buttons had the same api as analog controls, it's
just that they only reported 0 or +1, never any fractions (and since it
sounds like some controls have pressure-sensitive buttons this may make
it easier to use the same code on different controls).
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