dd7edd5e38
sylpheed-port corrected the disc figure I compared against: the leaf's final segment HOLDS, so a cycle length is not a motion duration. Verified from the disc rather than accepted -- pteff03 moves over t=0..540 of a 600-unit cycle (4.000 px/unit, not 3.600) and pteff03a over 0..630 of 720 (4.063, not 3.556). Checking that sent me back to my own measurement, which was worse. "6-7 px/frame" came from eyeballing deltas between consecutive APPEARANCES in a capture that skips frames, so a delta of 7 often spans two frames. A least-squares fit of x against frame over all 132/112 points gives +4.287 and -4.348 px/frame, with rms residuals of 3.6 and 3.3 px. So the confirmation I reported was a prediction 20 % too low meeting a measurement 50 % too high. Neither number was right and the agreement was an artefact of both being wrong -- which is the most dangerous form of agreement in this corpus, because nothing about it looked suspicious. The corrected numbers say something larger than the claim they replace. Measured against declared: 4.287/4.000 = 1.072 units per frame, and 4.348/4.063 = 1.070. Two independent strips with different cycle lengths and different declared rates agree to three significant figures. Q1 establishes 2 units per RENDERED frame for top-level elements. So either a nested leaf record advances at about half the top-level rate, or Q1's factor does not apply to nested records. Measured, not explained, and flagged as deserving its own iteration because Q1 is load-bearing. One untested candidate recorded: 1 unit per 1/30 s of game time against the ~28.5 fps this corpus measures for the idle title gives 1.053, close to 1.07. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v
Sylpheed
A clean-room reverse engineering and port project for Project Sylpheed: Arc of Deception (Xbox 360, 2007).
Three things live here, in one repository so that a change spanning them lands as one commit:
| The decoders | crates/sylpheed-formats — the disc's formats, read and verified disc-wide |
| The port | port/ — a Godot 4 project, plus crates/sylpheed-export which converts a disc into the open asset tree it reads |
| The corpus | docs/re/ — what has been reverse engineered, with its evidence, its retractions and its dead ends |
You need your own copy of the game. No game content is in this repository and none ever will be. The exporter reads the disc you supply.
The oracle is the real game
sylpheed-cliand the Explorer are tools for verifying our decoding. They are hypotheses under test and they have been wrong. When something must be checked against the truth, the truth is the game running in Xenia Canary, captured — not any renderer of ours.
This is stated first because getting it backwards is the most expensive mistake this project has made.
Layout
crates/
sylpheed-formats/ the decoders. Disc-wide verified; the corpus is its spec
sylpheed-cli/ headless tools -- render a screen, dump a table, probe audio
sylpheed-viewer/ the Explorer: a human's window onto the disc. STATIC data only
sylpheed-export/ disc -> the open, moddable asset tree
port/ the Godot 4 project. Reads open formats ONLY
authored/ decisions that are NOT on the disc, each with its reason
data/
base/ generated by the exporter. Gitignored, never hand-edited
mods/ drop-in overrides. Yours
docs/
re/ the corpus: findings, refutations, method traps
game/ how the game is navigated -- menus, modals, flight
port/ the port's mission, its handoff contract, modding rules
agents/ how the agent team works together
tools/ capture harnesses, probes, the share tool
exchange/ transient inter-agent files. NOT in git
docker/ the agent containers
Where to start
docs/re/INDEX.md— what is decodeddocs/re/REFUTED.md— what has been tested and dieddocs/re/METHOD.md— traps this project has already paid fordocs/game/navigation.md— how the game is navigateddocs/port/MODDING.md— why the asset tree looks the way it does
Xenia Canary is a separate repository: it is a fork tracking upstream, and it carries our instrumentation.
Conventions
Confidence is per claim, never per document: ✅ CONFIRMED · 🟡 PROBABLE ·
❔ HYPOTHESIS · ❌ REFUTED. A withdrawn result is kept with its reasoning
rather than deleted — that is why the numbers here can be trusted.