On Tue, 02 Nov 2010 09:19:53 -0700, <lilypond-user-requ...@gnu.org> wrote:
Yes, thanks. The problem is getting at the automatic behaviour which is
already available.
I beleive its a bug, that \stemDown obstructs explicit coming later.
\override Rest #'direction = #UP
Anders,
LilyPond does obey a simultaneous \stemDown and Rest'direction=#UP, when
deciding how to arrange a column where there are only rests,
but when there are both notes and rests, the rests act as if they had the Stem
direction.
If you are interested in the code, rest-collision.cc makes the placement
decisions based on the various 'directions. The distinction between columns of
rests, and columns with both notes and rests, is clearly intentional. It is
less clear if the use of Stem 'direction to place rests, in the
notes-plus-rests case, was intentional.
For Rachmaninoff's Prelude in C-sharp minor, the voices are separated so far in
pitch, that distinct stem directions are not required. You could let the stems
take their natural direction, and since rest-collision.cc insists on asking
your rests what is their Stem direction, and since un-pitched rests in a
stemNeutral voice answer based on neutral-direction :
\new Staff <<
\new Voice {\voiceOne \stemNeutral
\override Stem #'neutral-direction = #UP
r8 c'' d'' e'' r b' r d''}
\new Voice {\voiceTwo \stemNeutral
c2 d4 r4} >>
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