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docs: SeaLevelModel/SeaLevelValue config notes (terrain-water task 04)

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Both sea-level modes documented (flat default 0.15 / legacy field
Lerp); noted the blueprint does not record which model produced it —
the WBTB levels are the observable. Batch runner lives in /tmp
(throwaway), not in-repo.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Stewart Howe 2026-08-07 06:25:19 -04:00
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5
Tools/Scripts/README.md
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@ -11,8 +11,9 @@ Generates the entire 2D blueprint. Roughly in order:
2. **Topography** — FastNoiseLite base height plus a mountain spine, minus a squircle distance
falloff, giving a guaranteed island. Noise frequency is divided by `scaleFactor`
(`MapSize / 1024f`) so terrain features stay the same real-world size at any map profile.
3. **Sea level and water** — temperature-driven sea level; flood fill separates true ocean from
inland lakes; a mainland fill guarantees one contiguous landmass.
3. **Sea level and water** — sea level per the configured model (`SeaLevelModel`: `"flat"` scalar
— the default, `SeaLevelValue` 0.15 — or the legacy `"field"` latitude Lerp); flood fill
separates true ocean from inland lakes; a mainland fill guarantees one contiguous landmass.
4. **The crater** — placed along the northern coast and carved to below sea level, but only out to
**80 % of its radius**, which guarantees a landbridge rather than severing the island.
5. **Water bodies** — promotes the classified water into explicit data: the ocean as body 1, each