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re: EnumAsteroid counts the rocks, and the hash join was mine to fix

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EnumAsteroid is the frame record's FrameCount - 57/57, zero mismatches. Each
AsteroidFrameName is itself an IDXD record name; those records carry one named
field, FrameCount, plus a run of anonymous ones, and the anonymous fields
number exactly 8 x FrameCount on all 384 occurrences (ratio histogram
{8.0: 384}). The frame record is the placement table, 8 values per asteroid,
and EnumAsteroid counts the rocks. The frame-name -> EnumAsteroid map is
single-valued for all 64 names.

mission-wave-arrivals already met these records - they were the outliers that
broke its route-speed measurement, filtered out by name. regn-map-grid already
guessed the link and said so honestly ("a reading, not a measurement; nothing
here counts objects"). Neither says the count is exact.

The abandoned table lost its placement data too: exactly 7 of 64 frame names
have no record, and they are exactly the seven groups of the unreferenced
tenth object (Frame_Alpha_S01_Asteroid_{01,02,04}, Frame_Alpha_S01_Haze_
{01,02,03}, Frame_TAlpha_S01_Asteroid_03). 57 + 7 = 64, zero partials.

Withdrawing the previous commit's red flag: the hash join works and my call
was wrong. AsteroidDefinition values resolve to their objects' pak entry keys
as name_hash("stage\" + name), 9 of 9, each landing on the object the
frame-prefix join independently predicted. I had hashed the bare file name;
archive_naming.py hashes prefix + name over a path-prefix list. Two
independent joins, 9/9 agreement, both leaving the same tenth object
unreferenced.

Not settled: what the 8 values per asteroid are; why S28_p1 has a volume and
no definition.

All fifteen artefacts byte-identical.
This commit is contained in:
Sylpheed RE agent
2026-08-28 01:48:52 +00:00
parent c53da9ea2a
commit 863a88dbf3
3 changed files with 85 additions and 10 deletions
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docs/re/INDEX.md
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@@ -119,7 +119,7 @@ files, which is how the same ground got covered twice.
| [`structures/isl-message-dialogue-link.md`](structures/isl-message-dialogue-link.md) | Mission scripts as dialogue — built-in 64 -> message id -> caption text | ✅ CONFIRMED total, 2 683/2 683 call sites across all 28 stages resolve, no residue |
| [`structures/mission-objective-counter.md`](structures/mission-objective-counter.md) | `REMAINING OB` — the mission's own objective counter, in RAM | ✅ CONFIRMED for one Stage 02 run: a big-endian u32 whose value |
| [`structures/movie-subtitles.md`](structures/movie-subtitles.md) | Movie subtitles & the movie ↔ mission ↔ text chain | — |
| [`structures/asteroid-fields.md`](structures/asteroid-fields.md) | `AsteroidGroup_00N` — the asteroid-field tables a `Phase_N.AsteroidDefinition` names | ✅ 10 objects/pack, 384 group records, 3 fields each (`AsteroidModelName`, `AsteroidFrameName`, `EnumAsteroid` = a count 1…588); `Enum<Thing>` counts while `Enumerate<Thing>` names a table (54/60); 🔑 a tenth `Frame_Alpha_S01_*` object nothing references — and it is the one that miscounts; 🔑 **S28_p1 has an asteroid volume but no definition** |
| [`structures/asteroid-fields.md`](structures/asteroid-fields.md) | `AsteroidGroup_00N` — the asteroid-field tables a `Phase_N.AsteroidDefinition` names | ✅ 10 objects/pack, 384 group records, 3 fields each (`AsteroidModelName`, `AsteroidFrameName`, `EnumAsteroid` = **the frame record's `FrameCount`, 57/57**, and the frame holds 8 anonymous values per asteroid); `Enum<Thing>` counts while `Enumerate<Thing>` names a table (54/60); the join resolves as `name_hash("stage\" + name)` 9/9; 🔑 a tenth `Frame_Alpha_S01_*` object nothing references — it miscounts AND its 7 frames have no placement records; 🔑 **S28_p1 has an asteroid volume but no definition** |
| [`structures/mcol-collision.md`](structures/mcol-collision.md) | `MCOL` — same container and map parameters as `REGN` | 🟡 OPENED — `POF0` at `data_size+16` 11/11, bbox pad words 11/11, `extent == max−min` 11/11, and bbox + cell-size distributions identical to `REGN` (2/6/3 and 2/9); everything past `0x40` ❔ |
| [`structures/regn-map-grid.md`](structures/regn-map-grid.md) | `REGN` — a per-map spatial grid (and `MCOL` beside it) | ✅ CONFIRMED for the header, which self-checks on all 11 objects on |
| [`structures/savegame-format.md`](structures/savegame-format.md) | Save file (`savedata`) — container ✅ exact, 3 fields named ✅, rest ❔ (2026-08-11) | ✅ CONFIRMED for the container and the chunk layout — parsed off the |