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docs: curve v2 — TCRV spikeMax semantics, TerrainCurve v2 default, v1 retired (terrain-water task 06)

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Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Stewart Howe 2026-08-08 00:29:34 -04:00
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13
Core/Scripts/BLUEPRINT_FORMAT.md
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@ -55,7 +55,7 @@ Every section: `[u32 tag][u64 payload-length in bytes][payload]`.
| `HGTS` / `0x53544748` | `MapSize²` × `f32` height, **X outer / Y inner** | Mandatory. The second index is the map's north/south axis; the server consumes it as world **Z**. (This axis convention was never written down for v1 — it is now normative.) Length must equal `4·MapSize²`. | | `HGTS` / `0x53544748` | `MapSize²` × `f32` height, **X outer / Y inner** | Mandatory. The second index is the map's north/south axis; the server consumes it as world **Z**. (This axis convention was never written down for v1 — it is now normative.) Length must equal `4·MapSize²`. |
| `BIOM` / `0x4D4F4942` | `MapSize²` × `u8` biome ordinal, same pixel order | Mandatory. Ordinals from `Enums.cs::Biome` — **append-only, never reorder** (the ordinal IS the wire value). Writer refuses ordinals > 255; reader rejects ordinals ≥ the known biome count (parse-time validation; the palette's runtime Dirt fallback for in-memory values is unchanged). Length must equal `MapSize²`. | | `BIOM` / `0x4D4F4942` | `MapSize²` × `u8` biome ordinal, same pixel order | Mandatory. Ordinals from `Enums.cs::Biome` — **append-only, never reorder** (the ordinal IS the wire value). Writer refuses ordinals > 255; reader rejects ordinals ≥ the known biome count (parse-time validation; the palette's runtime Dirt fallback for in-memory values is unchanged). Length must equal `MapSize²`. |
| `TOWN` / `0x4E574F54` | `i32 count`, then per town: `f32 X` · `f32 Y` · `u8 tier` · `u8 isHighwayNode` (0/1) | Tier ordinals from `Enums.cs::TownTier`, append-only, range-checked on read. The highway-node flag is what the generator's road topology was built from (v1 dropped it); carried and exposed on the parsed blueprint, consumed by nothing server-side yet. | | `TOWN` / `0x4E574F54` | `i32 count`, then per town: `f32 X` · `f32 Y` · `u8 tier` · `u8 isHighwayNode` (0/1) | Tier ordinals from `Enums.cs::TownTier`, append-only, range-checked on read. The highway-node flag is what the generator's road topology was built from (v1 dropped it); carried and exposed on the parsed blueprint, consumed by nothing server-side yet. |
| `TCRV` / `0x56524354` | 50 B: `u16 curveVersion` · input knots `f32 t1..t4` · `f32 hmaxCal` · output bands `f32 sea` · `f32 orangeCeil` · `f32 redCeil` · `f32 plateauLo` · `f32 plateauHi` · `f32 peakCap` · `f32 tailSlope` | Optional — present iff the height-redistribution curve shaped this blueprint's `HGTS` (config `TerrainCurve: "v1"`); absent = raw legacy profile. **Metadata only:** exported heights are already curved; nothing re-applies the map. The curve itself lives in `Tools/Scripts/HeightCurve.cs` (calibration provenance in its header + the task-05 report). | | `TCRV` / `0x56524354` | 50 B: `u16 curveVersion` · input knots `f32 t1..t4` · `f32 spikeMax` · output bands `f32 sea` · `f32 orangeCeil` · `f32 redCeil` · `f32 plateauLo` · `f32 plateauHi` · `f32 peakCap` · `f32 tailSlope` | Optional — present iff the height-redistribution curve shaped this blueprint's `HGTS` (config `TerrainCurve: "v2"`); absent = raw legacy profile. **`spikeMax` semantics by version:** v1 = the pooled calibration max (identical every seed); **v2 = the SEED'S own effective raw pre-curve maximum** — the per-seed spike normalizer, which is why blueprints are no longer reproducible from curve constants alone and the value is recorded here. **Metadata only:** exported heights are already curved; nothing re-applies the map. The curve lives in `Tools/Scripts/HeightCurve.cs` (calibration provenance in its header + the task-05/06 reports). |
| `WBID` / `0x44494257` | `MapSize²` × `u16` water-body id, same pixel order as `HGTS` | Optional (absent = no water data, e.g. a legacy re-encode). `0` = no water, `1` = **the** ocean body, `2..N` = lakes. Ids assigned in deterministic scan order (X outer / Y inner, first-encountered pixel), lakes labeled with the **same 4-connectivity as `CalculateTrueOcean`**. Membership is exactly the generator's water classification — the biome grid's Ocean/Lake pixels and this grid's nonzero pixels are the same set **by construction** (shared predicates). Length must equal `2·MapSize²`. | | `WBID` / `0x44494257` | `MapSize²` × `u16` water-body id, same pixel order as `HGTS` | Optional (absent = no water data, e.g. a legacy re-encode). `0` = no water, `1` = **the** ocean body, `2..N` = lakes. Ids assigned in deterministic scan order (X outer / Y inner, first-encountered pixel), lakes labeled with the **same 4-connectivity as `CalculateTrueOcean`**. Membership is exactly the generator's water classification — the biome grid's Ocean/Lake pixels and this grid's nonzero pixels are the same set **by construction** (shared predicates). Length must equal `2·MapSize²`. |
| `WBTB` / `0x42544257` | `i32 count`, then per body (20 B): `u16 id` · `u8 type` (0 ocean, 1 lake) · `u8 salinity` (0 fresh, 1 salt) · `f32 surfaceLevel` · `i32 pixelCount` · `f32 centroidX` · `f32 centroidY` | Optional, paired with `WBID`. **`surfaceLevel` is a documented TRANSITIONAL rule:** one flat level per body — `GetSeaLevel` at the body's pixel centroid (ocean: at the map centre) under the still-live latitude field; superseded by the flat-scalar sea model (minted, lands with the coast change set). The field's per-pixel slope is deliberately NOT baked into any section. **Salinity is a provisional default** (ocean salt, lake fresh) — a placeholder for the future fresh/salt irrigation mechanic, not a mechanic. | | `WBTB` / `0x42544257` | `i32 count`, then per body (20 B): `u16 id` · `u8 type` (0 ocean, 1 lake) · `u8 salinity` (0 fresh, 1 salt) · `f32 surfaceLevel` · `i32 pixelCount` · `f32 centroidX` · `f32 centroidY` | Optional, paired with `WBID`. **`surfaceLevel` is a documented TRANSITIONAL rule:** one flat level per body — `GetSeaLevel` at the body's pixel centroid (ocean: at the map centre) under the still-live latitude field; superseded by the flat-scalar sea model (minted, lands with the coast change set). The field's per-pixel slope is deliberately NOT baked into any section. **Salinity is a provisional default** (ocean salt, lake fresh) — a placeholder for the future fresh/salt irrigation mechanic, not a mechanic. |
| `WSRF` / `0x46525357` | `MapSize²` × `u16` quantized water-surface elevation, same pixel order | Optional, paired with `WBID`. `0` is the reserved **no-water sentinel**; a real level `L` (raw height units) encodes as `1 + round(L × 32768)` so it can never encode to 0; decode `(q − 1)/32768` (`BlueprintFormat.EncodeWaterLevel`/`DecodeWaterLevel`). Covers `[0 … ~1.99997]` raw at `1/32768` raw ≈ **7.7 mm** of world height (1 raw = 251 m) — far finer than the 1 m voxel. Nonzero exactly where `WBID` is nonzero; the value is the pixel's body level. | | `WSRF` / `0x46525357` | `MapSize²` × `u16` quantized water-surface elevation, same pixel order | Optional, paired with `WBID`. `0` is the reserved **no-water sentinel**; a real level `L` (raw height units) encodes as `1 + round(L × 32768)` so it can never encode to 0; decode `(q − 1)/32768` (`BlueprintFormat.EncodeWaterLevel`/`DecodeWaterLevel`). Covers `[0 … ~1.99997]` raw at `1/32768` raw ≈ **7.7 mm** of world height (1 raw = 251 m) — far finer than the 1 m voxel. Nonzero exactly where `WBID` is nonzero; the value is the pixel's body level. |
@ -106,11 +106,12 @@ body).
which model produced it (the `WBTB` levels are the observable). which model produced it (the `WBTB` levels are the observable).
- **`SkipRoads`** (bool, default false) — exports with present-but-empty road sections (see the - **`SkipRoads`** (bool, default false) — exports with present-but-empty road sections (see the
road-section table note). road-section table note).
- **`TerrainCurve`** (`"v1"` | `"off"`, default `"v1"`) — whether the height-redistribution curve - **`TerrainCurve`** (`"v2"` | `"off"`, default `"v2"`; `"v1"` retired by the task-06
(storm ladder: 75 % orange coverage, 50 m plateau, 220 m peaks) shapes `HGTS`. Biome/water recalibration and rejected loudly) — whether the height-redistribution curve (storm ladder:
classification is curve-invariant by construction (it classifies the retained uncurved 75 % orange coverage, 50 m plateau, **per-seed-normalized 420 m peaks**) shapes `HGTS`.
heights); town positions and everything 3D follow the curved terrain. When on, `TCRV` records Biome/water classification is curve-invariant by construction (it classifies the retained
the effective parameters. uncurved heights); town positions and everything 3D follow the curved terrain. When on,
`TCRV` records the effective parameters including the per-seed `spikeMax`.
### Deliberately NOT a section: basins (`BSIN`) ### Deliberately NOT a section: basins (`BSIN`)

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 2. **Topography** — FastNoiseLite base height plus a mountain spine, minus a squircle distance
falloff, giving a guaranteed island. Noise frequency is divided by `scaleFactor` 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. (`MapSize / 1024f`) so terrain features stay the same real-world size at any map profile.
When `TerrainCurve: "v1"` (the default), the calibrated height-redistribution curve When `TerrainCurve: "v2"` (the default), the calibrated height-redistribution curve
(`HeightCurve.cs` — flat farmable lowlands, 50 m plateau shelf, 220 m peak cap) reshapes (`HeightCurve.cs` — flat farmable lowlands, 50 m plateau shelf, and a per-seed-normalized
spike to the 420 m peak cap: every island's tallest point reaches the ceiling) reshapes
above-sea terrain after noise/falloff/Trench and before the crater carve; biome above-sea terrain after noise/falloff/Trench and before the crater carve; biome
classification reads a retained uncurved map, so biomes are identical either way. Drops the classification reads a retained uncurved map, so biomes are identical either way. Drops the
`0_height` hillshade snapshot (hypsometric bands × NW hillshade) in both modes. `0_height` hillshade snapshot (hypsometric bands × NW hillshade) in both modes.