+ Grob *stem = stems[seg.stem_index_];
+ Drul_array<Real> beamlet_length =
+ robust_scm2interval (stem->get_property ("beamlet-default-length"), Interval (1.0, 1.0));
+ Drul_array<Real> max_proportion =
+ robust_scm2interval (stem->get_property ("beamlet-max-length-proportion"), Interval (0.5, 0.5));
+ Real length = beamlet_length[seg.dir_];