By popular demand, the "Transformation Channel" driver variable type
now has a "local space" transform space option which uses the same
magic that constraints use for defining local-space. This is what many
bug reporters and feature requesters have moaned about for a while
now, so after reviewing several of the bug reports which lead to the
current situation, here is what has been much-wanted for so long!
In order to implement this, I've:
- renamed the old "Local Space" option here to "Transformation Space",
in order to prevent old rigs breaking. This has also been kept, as it
is useful for #21384 (though perhaps with this new option it isn't
needed anymore)
- reviewed my fix for #20870 (IIRC, a Durian-era bug), which related
to the non-uniqueness of matrix->euler decomposition
a4216cb1d4