jpmschweitzerandClaude Opus 4.8
fa8b6ebf08
Resolves Q-101 — how a coarse Layer-1 cell + seed becomes coherent ~1m voxel geometry across the scale jumps. The tile-derivation-contract workshop output: - three-carrier refinement chain RegionProfile -> ChunkContext -> VoxelColumn, pure deterministic, no authoring at the derivation layers - district-temperature climate primitive (2x2 km, C, nullable) + separate moisture; everything climatic derives from temperature(+moisture) - scattered, transient freeze/snow model (freshwater +5..-10, sea ice own band, snow moisture-gated; forms cold phase / melts warm phase) - stateless f64-to-voxel domain warp (anti-squaring) - 8 morphology families over a frozen 17-zone vocabulary, gated decision tree - seams prevented at source (gate ordering + build-time matrix); valid geomorphic seams kept sharp + warped Includes workshop brief, round-1 positions, and workshop-outcomes.md. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
104 lines
6.3 KiB
Markdown
104 lines
6.3 KiB
Markdown
---
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title: "Miri Round 1 — Morphological realism and named-feature stability"
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workshop: tile-derivation-contract
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participant: Miri
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round: 1
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date: 2026-06-07
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note: "Authored by the Miri agent (read-only tool-set); transcribed to disk by the lead."
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---
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# Miri Round 1: What the Morphology Family Must Honor
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## Framing: what "reads true" on an alien world
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The Reach's bodies are not Earth — different gravity, hydrospheres, tectonic
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histories — but they obey the same physical laws. "Reads true" ≠ "looks like
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Earth"; it means terrain behaviour is internally consistent with the body's
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parameters. A moonless world shows no tidal flats; a tropical ocean world shows
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no fjords; a volcanic body has immature drainage and lava sheets, not deeply
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incised river valleys; a GlaciationGrade-0 body has V-shaped fluvial valleys, never
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glacial U-profiles. The uncanny valley in terrain is one rule broken visibly in
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one spot — one river flowing uphill destroys a hundred correct ones.
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## 1. Morphological laws the derivation must honour
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- **Drainage consistency (non-negotiable).** Channels descend monotonically; the
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meander algorithm adds sinuosity but must respect the D8 thalweg direction
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(D-208) — never raise the channel floor. Tributaries join from upstream; river
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mouths sit at sea level, no exceptions.
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- **Lithology → landform.** TerrainMaterial bounds the allowed slope/form: Rock →
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vertical faces/cliffs; Sand → ≤ angle of repose (~32°), dunes not cliffs; Gravel
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→ braided channels/fans (not single-thread meander); Soil → rolling/floodplain;
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Wetland → ≤5° flats; Lava → sheets/shield slopes + lava tubes, immature drainage.
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The family selector must honour this at region scale (no dune algorithm on a rock
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coast; no incised-gorge family on high-Lava regions).
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- **Glaciation history → form (globally visible).** Fjord requires GlaciationGrade
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≥ 2; U-valleys ≥ 1; moraine ridges ≥ 1; cirques ≥ 2. GlaciationGrade-0 high-relief
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is knife-edge V-ridges from fluvial erosion, not glacial. Fjord-vs-cliff-coast is
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a **boolean exclusion** on GlaciationGrade, not a weighted roll.
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- **Climate → vegetation coherence.** Treeline transitions Forest → Scrub → Barren
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(no direct Forest→Barren); polar latitudes are Tundra/Barren even at sea level;
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riparian Thicket/Scrub band 1–3 tiles along every perennial waterway (visual +
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tactical); natural vegetation boundaries follow contours/moisture, not chunk edges.
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- **Coast type is multi-factor** (slope × lithology × glaciation × tidal/moon ×
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sediment): fjord / cliff coast / dune strand / tidal flat / delta / lava coast,
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with the fjord↔cliff gate hard-keyed on GlaciationGrade.
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## 2. Named features — the wiki/atlas consistency contract
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D-228 is right that named types are derived display labels, never stored — which
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makes **label derivation canonical + stable** load-bearing: the `MorphologyZone`
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enum→label-string mapping must be frozen at content-authoring time, or every named
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feature across all bodies shifts at once (bulk lore contradiction). The stable API
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wiki authors/Atlas depend on is the **zone vocabulary**, not the underlying axis tuple.
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**Priority-1 lore-anchored bodies (direct wiki→generator contracts):**
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- **Kallast (Ran)** — "grain fields visible from low orbit" ⇒ alluvial-plain dominance, Soil, very low slope; no mountain ranges/fjords.
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- **Velen (Van Maanen's Star, D-050)** — temperate-maritime, fog ⇒ CoastalLowland, tidal-flat/dune coast, no cliff coasts/fjords.
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- **Ross 128 primary** — "predominantly ocean" ⇒ low-elevation island terrain, dune/tidal coast, no cliff coasts/fjords.
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- **Cygni B** — dense high-iron ⇒ Rock/Lava substrate, volcanic plains, immature drainage; not incised valleys/alluvial plains.
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- **Grünfeld** — dim flux + decades of soil amendment ⇒ marginal Gravel/Rock substrate, Scrub/Barren natural baseline (settlement layer adds Crop).
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**Priority-2 type-consistency:** wherever the Atlas shows "fjord"/"mountain pass"/
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"river bank"/"delta", the geometry must follow through (deep water by cliff walls;
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saddle profile + flanking elevation; riparian band + bench; distributary fan).
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**Proposed canonical MorphologyZone vocabulary (~17):** open ocean, lake, tidal
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flat, dune strand, cliff coast, fjord, delta, estuarine, alluvial plain, river
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bank, meander reach, braided plain, valley floor, mountain pass, alpine, volcanic,
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wetland. Agree these before Phase-4 content authoring resumes (named now, not
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necessarily implemented).
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## 3. Answers to Tyre's questions
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- **Sub-chunk variation:** no secondary zone field needed on `ChunkContext`. Meander
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reach (ox-bows) and delta (distributary islands) handle sub-chunk features
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*internally*; tidal-flat wet/dry is a whole-region state from the Q-105 water
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height. Tyre's `ChunkContext` as sketched suffices.
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- **RegionProfile persistence:** store `RegionProfile` (incl. `morphology_zone`) in
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`BodyWorldState` at the **same cache tier as D-209 feature tags** — the Atlas
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reads labels at region resolution (~6,000 regions/body) and must not trigger
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chunk-level derivation. ~tens of KB/body; populate in the D-206 background pass
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(~50 ms/body order).
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## 4. Body-class modulation of RIVER_THRESHOLD
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The global `RIVER_THRESHOLD = 200` should vary by body class via an integer lookup
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`(hydrosphere, tectonic_activity, precipitation_class) → threshold`. Crucially,
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`precipitation_class` (and `GlaciationGrade`) should be **derived from body-level
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params** (stellar type, orbital radius, hydrosphere), not authored per body —
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authored values silently drift from the terrain the generator actually produces.
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## 5. Setting-voice note (Phase-6, flagged not to foreclose)
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Keep the label vocabulary as plain English geography terms; the Drifter's-Guide
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setting voice layers on top in content authoring. Round 2 should not constrain the
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vocabulary in a way that blocks that later layer.
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## 6. What I need in Round 2
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- **Gestalt:** the ≥6 families + selectors; confirm the Priority-1 lore bodies are
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reliably producible, and that GlaciationGrade-0 → no-fjord is a hard pre-selector gate.
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- **Tyre:** confirm `RegionProfile` lives in `BodyWorldState` at the D-209 tier; confirm
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`GlaciationGrade`/`precipitation_class` are derived from body params, not authored.
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- **Troblum:** confirm memory feasibility of ~6,000 `RegionProfile`s/body in the cache.
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