72 lines
3.9 KiB
Markdown
72 lines
3.9 KiB
Markdown
# World factory "production lines" (conveyors) — where to find them
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The game has **fixed single-recipe world structures** — item conveyors that run *one*
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recipe (e.g. **1 Raw Aurogen Crystal → 10 Energy Rods**). These are a separate mechanic
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from the player **workbench** recipes (which live in `extracted/crafting_recipes.json`,
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sourced from `CraftingRecipeBundle` assets). This note records **where they live** so the
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data can be re-derived after a game update.
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## The mechanic
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In code it's a *"Factory Production Line"*. It's an Entitas ECS feature, namespace
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`Hologryph.Sand.Shared.Game.Features.Crafting` (see `il2cpp/dump.cs`):
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| Class | Holds |
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|---|---|
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| `ProductionLineComponent` | `int inputEntityIndex`, `int outputEntityIndex` |
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| `ProductionLineRecipeComponent` | `CraftingRecipe recipe` ← the recipe |
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| `ProductionLineInputDataComponent` / `…OutputDataComponent` | `bool isLargeItem{Input,Output}` |
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| `CraftingRecipe` | `CraftingIngredient[] inputIngredients`, `CraftingIngredient[] outputIngredients`, `float craftingTimeSeconds` |
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| `CraftingIngredient` | `string itemId`, `int amount` |
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Note `CraftingRecipe` / `CraftingIngredient` are the **same types** the workbench uses —
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only the container differs (a workbench holds `List<CraftingRecipeBundle> recipeBundles`;
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a production line holds a single `CraftingRecipe` on the entity).
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## Where the data lives
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- **Bundle:** `epb_assets_all.bundle` (reachable via the `bundles/` symlink).
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- **Prefabs:** `game_conveyor_*_epb.prefab`, under
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`Assets/Content/Game/game_conveyor/...`. 14 carry a recipe; 4 of them are named
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`game_conveyor_base*` (large/small in→out variants) — what distinguishes them from
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the product-named ones beyond the name is not established here.
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- **Serialization:** each prefab GameObject (`m_Name = game_conveyor_<x>_epb`) has two
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components — a `Transform` and a `MonoBehaviour` whose script is **`EntityBlueprint`**.
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`EntityBlueprint : SerializedMonoBehaviour` (Sirenix Odin), so the component data —
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including the `CraftingRecipe` — is in its **Odin-serialized
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`serializationData.SerializedBytes`**, not in plain typetree fields. (Same situation as
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the loot tables — see [TASK.md](TASK.md) / `extract_loot.py`.)
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### Extraction path (how to read it)
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`UnityPy` (with an IL2CPP `TypeTreeGenerator` over `GameAssembly.dll` +
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`global-metadata.dat`) reads the `EntityBlueprint` MonoBehaviour → pull
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`serializationData.SerializedBytes` → `bundle/odin_read.py` parses the Odin binary →
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walk the tree for the node with `inputIngredients` / `outputIngredients`.
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```bash
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venv/bin/python bundle/extract_production_lines.py # -> extracted/production_lines.json
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```
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Key item ids seen here: `item_crystalHandles` = *Raw Aurogen Crystal*,
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`item_energyBar` = *NZ Mk2 Energy Rod*, `item_blackBox` = *Black Box*,
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`item_resourceCoralPiece` = *Coral Chunk*. Resolve any id → display name via
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`extracted/items_registry.json` / `extracted/item_names.json` (built from
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`CheatItemDefinitionsData`).
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## Island placement — open lead
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Which factory/island runs which conveyor is grouped by the
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`energy_grid_*_epb.prefab` blueprints in the same bundle:
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`Wunderinsel`, `Kaiserplatz`, `DeusExMachine`, `Factorio`, `LittleFactory1-3`,
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`LittleFactoryArmory1-3`, `TestFactory`. The **`…Armory`** groups are the likely
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**Sprengstofffabrik** (explosives factory) host for the explosive / grenade / rocket /
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cannon conveyors.
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**Not yet resolved:** an `energy_grid_*` blueprint's Odin data references its conveyors by
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**entity reference, not item-id string** (a string scan of its serialized bytes finds no
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`game_conveyor_*` / `item_*` ids). So mapping recipe → specific island needs the **island
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prefab placements** in `islands_assets_all.bundle` (the `island_*` / fort / `loc_event_*`
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prefabs, where `Sprengstofffabrik` is an i2 `Toponyms/` name), not the conveyor or
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energy_grid EPBs alone. That linkage is the next step if island attribution is wanted.
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