sylpheed-port could not transfer the masking rule to their screens and inferred a
precondition: my free-running element is a localised plate I can crop around,
theirs is a wide sweep they cannot. Tested against my own screen, that is wrong.
The JP title carries the SAME sweep -- the leaves are identical on entries 4, 5
and 7, which I established last iteration -- and it crosses the box:
two renders of build 7 on the settled plateau, t=135 vs t=240
whole frame RMSE 12.135 95 791 px
in the box RMSE 11.923 57 981 px <- the sweep IS inside the box
differences span y 70..674, x 128..1140; the box is y 54..476, x 389..776
So the crop did not exclude the mover, and the in-box between-session term of
0.3215 has no explanation in the crop. Which leaves a tension worth stating:
two RENDERS one plateau-phase apart differ by 11.9 inside the box;
two CAPTURES of that screen from different sessions differ by 0.32 there;
and the --at sweep of renders against a capture is flat to 1.2 across
t=135..240, despite those renders differing from each other by 11.9.
A metric cannot be insensitive to an 11.9 change unless what changed is largely
absent from what it is compared against.
Hypothesis, recorded as untested: the game may not draw these leaves on the
settled title at all, while our renderer poses them wherever --at says. That
would explain the flat plateau, the tiny between-session term and part of the ~40
residual together. It would also mean the port's "the leaf free-runs in the game
too" is not established by their evidence -- their two minima come from two
DIFFERENT screens, which can differ for reasons other than phase, whereas my two
captures are of the same screen and barely differ where the sweep would be.
Not claiming the leaves are invisible; that needs a draw-stream check for
pteff03/pteff03a on a settled title, which is one run. What is established is
narrower and enough to stop the inference.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v
21de7841da