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re: BackGroundID is an identity, not a file name; its sibling names the asset

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The one value class that resolved to neither a record nor a file resolves to
neither because it is neither. BackGroundID lives on StageResource (174 records
carry it) directly beside BackGroundPackage, and that sibling holds the real
asset: game:\hidden\Resource3D\BG_<something>.xpr.

My earlier suffix sweep had a real bug: it tried BG_ and .xpr as alternatives,
never as a pair, so BG_Acheron.xpr was never in the search space. A
one-transform-at-a-time sweep cannot find a two-transform name.

But the obvious follow-on hypothesis - "the package is BG_<id>.xpr" - is also
refuted: it holds in only 12 of the 24 StageResource records carrying both
fields. Hargenteen spans six packages (BG_Hargenteen{,_near,_far,_dead}.xpr plus
BG_Acheron.xpr and BG_Stg26.xpr), and BG_Acheron.xpr serves both the Acheron id
(S09) and the Hargenteen id (S25). The relation is many-to-many in both
directions, roughly 18 distinct packages across 10 ids.

So the id is a logical place - Acheron, Earth, Hargenteen, Lebendorf - and the
package is the mesh actually loaded, chosen per stage from that place's _near /
_far / _dead variants. Two details fall out: PD is the Prometheus Driver
(BG_P_Driver.xpr, on S16, the boss stage), and the challenge stages that
re-dress a story sky carry bespoke BG_Stg24/26/27.xpr packages while keeping the
story stage's id - the same borrow-and-re-dress pattern already recorded for
maps and objectives.

Not settled: Original carries no BackGroundPackage at all; whether that means no
sky or an engine default is unknown.

All fifteen artefacts byte-identical.
This commit is contained in:
Sylpheed RE agent
2026-08-28 06:11:41 +00:00
parent 07aecb3d04
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docs/re/BACKLOG.md
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@@ -6380,3 +6380,30 @@ strings for all ten backgrounds — and also 0 for `Formation_4_Bird`,
`AI_Structure`, `NP_ArrowHead`, `ACROPOLIS`, `CollisionSet_S03.bin`, all of which
*do* resolve in data. The executable names no data value, so the negative
discriminates nothing.
---
## ✅❌ 2026-08-28 — `BackGroundID` is an identity; the sibling field names the asset
Item (a). The one value class that resolved to neither record nor file resolves
to neither **because it is neither**. `BackGroundID` lives on `StageResource`
(174 records) directly beside **`BackGroundPackage`**, which holds the real asset
`game:\hidden\Resource3D\BG_<something>.xpr`.
⚠️ **My earlier suffix sweep had a bug**: it tried `BG_` and `.xpr` as
alternatives, never as a pair, so `BG_Acheron.xpr` was never in the search space.
**A one-transform-at-a-time sweep cannot find a two-transform name.**
❌ **"the package is `BG_<id>.xpr`" is refuted** — true in only **12 of 24**
records. `Hargenteen` spans six packages (`_near`/`_far`/`_dead`, plus
`BG_Acheron.xpr` and `BG_Stg26.xpr`); `BG_Acheron.xpr` serves two different ids.
**Many-to-many both ways**, ~18 packages across 10 ids.
🔑 The id is a **logical place** (Acheron, Earth, Hargenteen, Lebendorf) and the
package is the mesh actually loaded, chosen per stage from that place's variants.
`PD` = the Prometheus Driver (`BG_P_Driver.xpr`, S16). The challenge stages that
re-dress a story sky carry bespoke `BG_Stg24/26/27.xpr` while keeping the story
id — the same borrow-and-re-dress pattern already seen for maps and objectives.
🟡 Not settled: `Original` carries **no** `BackGroundPackage` — whether that is
"no sky" or an engine default is unknown.