procedural-gen

1# Procedural generation
2 
3Generate levels, terrain, and loot from compact rules and a seed. The throughline
4of good procgen is **determinism**: a single seed reproduces the same world, so
5bugs are repeatable and players can share seeds. This skill owns the core
6algorithms — noise, seeded RNG, dungeon layout, weighted tables; genres like
7`roguelike` and `survival-crafting` consume it.
8 
9## When to use
10 
11- Use to generate maps, dungeons, terrain heightmaps, item drops, or any content
12  you do not want to author by hand.
13- Use when results must be **reproducible from a seed** (debugging, daily
14  challenges, shareable worlds).
15- Use to pick weighted random outcomes (loot rarity, spawn tables).
16 
17**When *not* to use:** for the engine's tile API to *paint* the result, use
18`godot-tilemap` or `unity-tilemap-2d`. For routing AI through the generated map,
19use `game-ai`. For carefully hand-paced levels, use `level-design` — procgen and
20authored design are complementary, not interchangeable.
21 
22## Core workflow
23 
241. **Own your randomness.** Create one seeded RNG instance and pass it
25   everywhere. Never call the global/static random in generation code — it makes
26   results irreproducible and order-dependent.
272. **Pick the technique for the content.** Continuous terrain/heightmaps → noise.
28   Discrete rooms/corridors → space partitioning or agent-based carving.
29   Outcomes with rarities → weighted tables.
303. **Generate into a plain data grid/array first**, decoupled from rendering.
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