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Re: Strange gap-behaviour with whole-note tremolo Beams

From: Torsten Hämmerle
Subject: Re: Strange gap-behaviour with whole-note tremolo Beams
Date: Fri, 27 Mar 2020 06:48:01 -0700 (MST)

Thomas Morley-2 wrote
> I have no clue why this happens and where those added values came from.
> Any insights?

Hi Harm,

Believe it or not, this strange (and certainly unintended) effect is caused
by the thickness of the invisible stems!

The beam shortening will actually depend on the beam thickness, as the beams
will start at the left side of the left beam and end at the right side of
the right beam.
For further investigation, I've added a layout block to your example:

\layout {
  \context {
    \override Stem.thickness = #100   % standard: 1.3

Obviously, the beam shortening deviations will start even earlier when using
stem thickness 0 and they will start later as the stem thickness increases.
When setting the stem thickness to approximately 50 or above, the stem
shortening deviations will vanish in all of your test cases (I hope the
table will be correctly displayed in raw format):

So I guess this unintended dependency on invisible beam thicknesses comes
from within the C++ code will have to be corrected there.

I'll open up a tracker issue and see what I can do about it.


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