collapse: one blow takes a nine-storey tower
The wrecking ball no longer chews the building down over five strikes. It
hangs, sweeps in on its arc, and lands one heavy blow on the section's single
impact cue — then carries straight on through the tower and out the back wall,
opening the corridor ahead of itself as it goes. The failure runs out and up
from the strike and the whole structure folds into its own footprint.
The building is now nine storeys instead of five, with cornice bands, a fire
escape up the right facade, and a roof deck (stair penthouse, water tank on
legs, vents, mast, signboard).
The part is 25 s instead of 30, so the score loses four bars from the collapse
section and every later section moves back with it; captions and the baked
soundtrack follow. Film is 335 s, score 260 bars.
Performance, whole part, measured back to back against the old part on the
same machine: physics p90 22.6 -> 1.8 ms, frame p90 56.5 -> 45.8 ms, spike
frames 11.1% -> 8.9%, frame p50 36.9 -> 33.8 ms. Structure is static until the
blow rather than kinematic, the release wave is a sorted walk instead of a
per-frame scan of the tower, settled rubble petrifies on a widening gate, and
the facade's glass and window frames fly ballistically instead of as bodies.