SOLVED
Hello again,
Given that \unset Staff.keepAliveInterfaces would affect the entire
StaffGroup, instead of trying to break out from that limitation, I moved
the Keep_alive_together_engraver to those two internal, mini-StaffGroups,
along with the \partCombine staves.
The final score structure looks like this:
\version "2.25.9"
>
> \layout {
> short-indent = #20
> indent = #30
> \context {
> \Staff
> keepAliveInterfaces = #'()
> }
> }
>
> violinI = {
> \key c \minor
> \repeat unfold 26 { d'4 }
> \once \unset Staff.keepAliveInterfaces
> <d' bes'>2
> \repeat unfold 40 { d'4 }
> }
>
> violinII = {
> \key c \minor
> \repeat unfold 26 { g4 }
> <g d'>2
> \repeat unfold 40 { g4 }
> }
>
> celloI = {
> \clef "bass"
> \key c \minor
> \repeat unfold 56 { bes,4 }
> \once \unset Staff.keepAliveInterfaces
> <d bes>2
> \repeat unfold 10 { bes,4 }
> }
>
> celloII = {
> \clef "bass"
> \key c \minor
> \repeat unfold 56 { g,4 }
> <g, d>2
> \repeat unfold 10 { g,4 }
> }
>
> \new StaffGroup <<
> \new StaffGroup \with {
> systemStartDelimiter = #'SystemStartSquare
> \consists "Keep_alive_together_engraver"
> }
> <<
> \new Staff \with {
> instrumentName = "Violins"
> shortInstrumentName = "Vn I & II"
> %\override VerticalAxisGroup.remove-layer = 2
> } { <>^"remove-layer = 2" \transpose c c \partCombine \violinI
> \violinII }
> \new Staff \with {
> instrumentName = "Violin I"
> shortInstrumentName = "Vn I"
> \RemoveAllEmptyStaves
> %\override VerticalAxisGroup.remove-layer = 1
> } { <>^"remove-layer = 1" \transpose c c \violinI }
> \new Staff \with {
> instrumentName = "Violin II"
> shortInstrumentName = "Vn II"
> \RemoveAllEmptyStaves
> %\override VerticalAxisGroup.remove-layer = 1
> } { <>^"remove-layer = 1" \transpose c c \violinII }
> >>
> \new StaffGroup \with {
> systemStartDelimiter = #'SystemStartSquare
> \consists "Keep_alive_together_engraver"
> }
> <<
> \new Staff \with {
> instrumentName = "Violoncellos"
> shortInstrumentName = "Vc I & II"
> %\override VerticalAxisGroup.remove-layer = 2
> } { <>^"remove-layer = 2" \partCombine \celloI \celloII }
> \new Staff \with {
> instrumentName = "Violoncello I"
> shortInstrumentName = "Vc I"
> \RemoveAllEmptyStaves
> %\override VerticalAxisGroup.remove-layer = 1
> } { <>^"remove-layer = 1" \celloI }
> \new Staff \with {
> instrumentName = "Violoncello II"
> shortInstrumentName = "Vc II"
> \RemoveAllEmptyStaves
> %\override VerticalAxisGroup.remove-layer = 1
> } { <>^"remove-layer = 1" \celloII }
> >>
> >>
>
Uncomment the \override VerticalAxisGroup.remove-layer lines and then it
works perfectly.
I hope this solution will be helpful to others.
On Fri, 10 Nov 2023 at 14:43, Adam M. Griggs <adammgri...@gmail.com> wrote:
> Hello list,
>
> https://lilypond.org/doc/v2.25/Documentation/notation/hiding-staves
>
> Is there a way I can get more control over the workings of
> the Keep_alive_together_engraver for the purpose of engraving divisi staves?
>
> Please consider the following, based on the linked example in the
> documentation:
>
> \version "2.25.9"
>>
>> \layout {
>> short-indent = #20
>> indent = #30
>> \context {
>> \Staff
>> keepAliveInterfaces = #'()
>> }
>> }
>>
>> violinI = {
>> \key c \minor
>> \repeat unfold 30 { d'4 }
>> \unset Staff.keepAliveInterfaces
>> <d' bes'>2
>> \repeat unfold 48 { d'4 }
>> }
>>
>> violinII = {
>> \key c \minor
>> \repeat unfold 30 { g4 }
>> <g d'>2
>> \repeat unfold 28 { g4 }
>> <> ^\markup \center-column { "unwanted" "violin div. " }
>> \repeat unfold 20 { g4 }
>> }
>>
>> celloI = {
>> \clef "bass"
>> \key c \minor
>> \repeat unfold 60 { bes,4 }
>> \once \unset Staff.keepAliveInterfaces
>> <d bes>2
>> \repeat unfold 18 { bes,4 }
>> }
>>
>> celloII = {
>> \clef "bass"
>> \key c \minor
>> \repeat unfold 28 { g,4 }
>> <> ^\markup \center-column { "unwanted" "cello div. " }
>> \repeat unfold 32 { g,4 }
>> <g, d>2
>> \repeat unfold 18 { g,4 }
>> }
>>
>> \new StaffGroup \with { \consists Keep_alive_together_engraver } <<
>> \new Staff \with {
>> instrumentName = "Violins"
>> shortInstrumentName = "Vn I & II"
>> \override VerticalAxisGroup.remove-layer = 2
>> } { \transpose c c \partCombine \violinI \violinII }
>> \new StaffGroup \with {
>> systemStartDelimiter = #'SystemStartSquare
>> }
>> <<
>> \new Staff \with {
>> instrumentName = "Violin I"
>> shortInstrumentName = "Vn I"
>> \RemoveAllEmptyStaves
>> \override VerticalAxisGroup.remove-layer = 1
>> } { \transpose c c \violinI }
>> \new Staff \with {
>> instrumentName = "Violin II"
>> shortInstrumentName = "Vn II"
>> \RemoveAllEmptyStaves
>> \override VerticalAxisGroup.remove-layer = 1
>> } { \transpose c c \violinII }
>> >>
>> \new Staff \with {
>> instrumentName = "Violoncellos"
>> shortInstrumentName = "Vc I & II"
>> \override VerticalAxisGroup.remove-layer = 2
>> } { \partCombine \celloI \celloII }
>> \new StaffGroup \with {
>> systemStartDelimiter = #'SystemStartSquare
>> }
>> <<
>> \new Staff \with {
>> instrumentName = "Violoncello I"
>> shortInstrumentName = "Vc I"
>> \RemoveAllEmptyStaves
>> \override VerticalAxisGroup.remove-layer = 1
>> } { \celloI }
>> \new Staff \with {
>> instrumentName = "Violoncello II"
>> shortInstrumentName = "Vc II"
>> \RemoveAllEmptyStaves
>> \override VerticalAxisGroup.remove-layer = 1
>> } { \celloII }
>> >>
>> >>
>>
>
> Is there a way I can divisi selected staves rather than the entire
> StaffGroup?
>
> Thank you.
>
>
