Prefecture Map Generator v16 - Causal Terrain Cleanup Edition

This version is designed to run directly in VSCode with Live Server. No npm setup is required.

Run

1. Open this folder in VSCode.
2. Right-click index.html.
3. Choose Open with Live Server.

Main changes in v16

• River action is much stronger. erosionField and depositionField now produce clearer valleys, terraces, and alluvial lowlands.
• Neighboring prefecture regions are generated as background territory with prefectureRegionId and regionalPrefectureBorders, so the current prefecture is no longer visually isolated.
• River color now uses the same blue family as the sea; hierarchy is expressed by width and opacity.
• CBD/DID cells are sparser and restricted to dense, connected urban fabric.
• Railways, roads, and expressways are pruned for long-distance purpose; compact local tangles are rejected except for environmental ring segments.
• Expressway rings are rare. ICs are sampled at shorter intervals along expressway corridors.
• Bridge and tunnel icon rendering was removed. The legacy arrays remain empty for compatibility.
• Municipal regions are less likely to split small urban areas, while large cities claim larger municipality-like areas.

Existing systems retained

• River hierarchy: main rivers, tributaries, and small streams.
• Port classes: major, regional, fishing, lake.
• Major rail corridors first, then purposeful branches.
• Expressways avoid city centers; city access is represented through IC access roads.
• Castles are restricted to terrain/historical candidate sites.
• Default generated names and manual overrides are both managed in names.js.
• Continuous terrain rendering is always on.

Editing place names

Edit names.js.

export const CUSTOM_NAMES = {
  "city-0": "Aohara",
  "port-0": "Shirahama",
  "castle-0": "Kurono"
};

Tests

Open test.html with Live Server to run the browser-side smoke tests, or run node --check *.js on the source files.