c53da9ea2a
New doc docs/re/structures/asteroid-fields.md, indexed.
Half the chain was already in the corpus: stage-definition-table and
stage-mission-tables record the per-phase AsteroidDefinition naming a .tbl,
and unit-datasheet-static partitions Generic and finds 10 per pack whose only
field is {EnumAsteroidGroup}, "an asteroid-group file". Neither says what is
inside them.
The table: 10 objects per pack x 6 packs = 60, 384 AsteroidGroup_* records,
4 or 7 groups per object. Every record carries exactly three fields, all 384,
no partials - AsteroidModelName (28 distinct; mob_n050..n056 x24 each,
mob_n040..n043 x18), AsteroidFrameName (64 distinct, Frame_S<NN>[_pN]_
Asteroid_NN, the same names regn-map-grid reports the Route tables showing),
and EnumAsteroid (37 distinct, 1..588, 6633 per pack summed).
Enum<Thing> is a COUNT; Enumerate<Thing> names a TABLE. EnumAsteroidGroup
equals its object's group count in 54 of 60 and EnumAsteroid is a plain
integer - the opposite of the Enumerate* join rule. The -erate is the
difference. Count-style fields still are not safe: the 6 failures are ONE
object repeated per language pack, declaring 4 while holding 7.
The tenth object is unreferenced and it is the one that miscounts. Joining by
frame prefix, nine objects match the nine AsteroidDefinition values one to
one; the tenth carries Frame_Alpha_S01_Asteroid, Frame_Alpha_S01_Haze and
Frame_TAlpha_S01_Asteroid and is named by nothing.
S28 has an asteroid VOLUME but no asteroid DEFINITION: mcol-collision lists
nine _AsteroidVolume_wp meshes (…, S28_p1); the nine AsteroidDefinition values
are those eight plus test_s8p1. Eight shared, one different each way.
Not settled: what EnumAsteroid counts of; why S28_p1 has a volume and no
definition. The name->object join did not reproduce by hash under name_hash,
mod 0x00FFF9D7, or a 24-bit mask - the join used is by frame prefix.
All fifteen artefacts byte-identical.
87 lines
4.4 KiB
Markdown
87 lines
4.4 KiB
Markdown
# The asteroid-field tables (`AsteroidGroup_00N`)
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**Status: ✅ decoded statically, 2026-08-28.** Every number below is an exact
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disc census over all 41 `.pak` archives using the corpus reader.
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## Where it sits in the chain
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[[stage-definition-table]] and [[stage-mission-tables]] already record that a
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stage's `Phase_N` block carries an **`AsteroidDefinition`** field naming a `.tbl`
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(`test_s8p1_asteroid.tbl` in the `_Test` template, `""` in most phases), and
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[[unit-datasheet-static]] already partitions the `Generic` records and finds
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**10 per pack whose only field is `{EnumAsteroidGroup}` — "an asteroid-group
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file"**. What neither says is what is *inside* those ten files.
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```
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Stage_SNN . Phase_N . AsteroidDefinition = "S04_asteroid.tbl"
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└── that object: Generic . EnumAsteroidGroup = "7"
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AsteroidGroup_000 … AsteroidGroup_006
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AsteroidModelName = mob_n050
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AsteroidFrameName = Frame_S04_Asteroid_01
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EnumAsteroid = 39
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```
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## ✅ The table
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**10 objects per pack × 6 `GP_MAIN_GAME_<lang>` packs = 60**, holding **384
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`AsteroidGroup_*` records** in total. Each object has **4 or 7** groups (12
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objects with 4, 48 with 7). Every group record carries exactly **three** fields,
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present on all 384 with no partials:
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| field | distinct values | what it is |
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|---|---:|---|
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| `AsteroidModelName` | 28 | the mesh — `mob_n050`…`mob_n056` (24 uses each) and `mob_n040`…`mob_n043` (18 each) |
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| `AsteroidFrameName` | 64 | `Frame_S<NN>[_pN]_Asteroid_NN` — the placement frame |
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| `EnumAsteroid` | 37 | a **count**, 1 … 588; 6 633 asteroids per pack summed |
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`Frame_S<NN>_Asteroid` is the same name [[regn-map-grid]] reports the mission
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`Route` tables showing independently — the frame is the join to the map data.
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## ✅ `Enum<Thing>` is a count; `Enumerate<Thing>` names a table
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`EnumAsteroidGroup` equals the number of `AsteroidGroup_*` records in its own
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object in **54 of 60** objects, and `EnumAsteroid` is a plain integer. That is
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the opposite of the `Enumerate*` convention, where the value is a child table's
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file name. **The `-erate` is the difference**, and it is worth checking the
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spelling before assuming which kind a field is.
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⚠️ `Count`-style fields still are not safe: the **6 failures are one object,
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repeated once per language pack** — it declares `4` and contains `7`.
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## 🔑 The tenth object is unreferenced, and it is the one that miscounts
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Joining the ten objects to the nine `AsteroidDefinition` values by frame prefix:
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| object's frame prefix | groups | declared | named by |
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|---|---:|---:|---|
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| `Frame_S01_Asteroid` | 4 | 4 | `S01_asteroid.tbl` |
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| `Frame_S04/S05/S13/S14_p1/S14_p2/S08_p1/S08_p2_Asteroid` | 7 | 7 | the matching `SNN[_pN]_asteroid.tbl` |
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| `Frame_Test_Asteroid` | 4 | 4 | `test_s8p1_asteroid.tbl` |
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| **`Frame_Alpha_S01_Asteroid` + `Frame_Alpha_S01_Haze` + `Frame_TAlpha_S01_Asteroid`** | **7** | **4** | **nothing** |
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Nine `AsteroidDefinition` names, nine matching objects, and a **tenth that no
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phase names** — an `Alpha` Stage-01 variant with its own `Haze` frames and a
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`TAlpha` set. It is also the only object whose declared count is wrong, which is
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what an abandoned table looks like.
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## 🔑 S28 has an asteroid *volume* but no asteroid *definition*
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[[mcol-collision]] lists **nine** `_AsteroidVolume_wp` collision meshes: S01,
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S04, S05, S08_p1, S08_p2, S13, S14_p1, S14_p2 and **S28_p1**. The nine
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`AsteroidDefinition` values are the same eight stages plus **`test_s8p1`**. So
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the two sets share eight and differ by one each: **`S28_p1` has the collision
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volume for an asteroid field but no table saying which rocks to scatter in it**,
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while `test_s8p1` has a table with no volume of its own.
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## 🟡 Not settled
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* What `EnumAsteroid` counts *of* — instances per frame is the obvious reading
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and the 1…588 range fits, but it is untested.
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* Why `S28_p1` has a volume and no definition (S28 is the challenge mission that
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alone flies `rou_f004`, see [[stage-numbering-and-player-craft]]).
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* 🔴 **The name→object join did not reproduce by hash.** `AsteroidDefinition`
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values do not map to their objects' pak entry keys under `name_hash`, nor under
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that key reduced `mod 0x00FFF9D7` or masked to 24 bits — the join above is by
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frame prefix, which is direct. Either these keys are not name hashes or
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[[archive-naming]]'s resolver differs from `unitgroup.name_hash`; not chased.
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