Hello, Lilypond handles slanted Beams in a geometrically weird way, that is, the thickness is not measured as the shortest distance between the opposing sides of the boundary, but as vertical distance. This results in Beams getting optically thinner and closer the higher the slope is. But we can very easily factor this out by adjusting the thickness to the slope. In fact if we want to achieve a real thickness theta the adjusted thickness would need to be theta·sqrt(1 + slope²). See attached an experimental example.
Cheers, Valentin
slanted beam thickness-current.pdf
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slanted beam thickness-new.pdf
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