93d69e6148
Their oracle run refutes their own 'may not draw these leaves' hypothesis and confirms my title curve from the game. Checked against my export: Rotation: the export carries rotation_deg +30 on pteff03 and -45 on pteff03a, constant across all four keyframes, matching their ROT flag. spin_period_units returns 0 for four-keyframe elements so the spin override does not fire and the port draws the declared angle. Directions: ptloop01 runs -639 -> 1521, ptloop02 runs 1721 -> -839 -- their strip A and strip B. Height: a 30-unit phase step changes a band 1121x720 and 1137x720, full frame height, which is what a 1134/1303 px strip on a 720 px screen must produce. The correction: their rate check divided 2160 px by a 600-unit cycle to get 3.6 px/unit, but the last segment HOLDS. pteff03 moves over t=0..540 then sits at 1521; pteff03a moves over 0..630 of 720. Corrected: 4.00 and 4.06 px/unit, predicting 8.0 px/frame against their measured 6-7. That widens the gap from 7.2-vs-6.5 to 8.0-vs-6.5, so 'the rate matches the disc' does not survive the corrected span, and a lower emulator frame rate moves the prediction the wrong way. A cycle length is not a motion duration -- same family as a pivot anchor read as a drawn extent. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01N7FiFFFwbvG2uxdcEh8HyF
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.