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feat: curve v4 — spatially modulated shelves (terrain-water task 08)

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Per the task-07 gate: the terraces work but uniform anchors put a flat
ring at exactly 100 m and 220 m on every mountain. v4 keeps v3's
structure (frozen toe/rise, three risers, per-seed u4 spike to 420 m)
and turns the shelf anchors into smooth spatial fields: bench
100+-12 m and plateau 220+-20 m via two decorrelated very-low-freq
Simplex fields (~3 undulations per island width), plus a strength
field (~5/island) blending each shelf's output span between ~2 m
(pronounced flat) and ~25 m (barely a hint) — the optional strength
modulation shipped, ordering-safe by construction (worst-case bench
top 0.6962 < plateau min 0.9468). Field seeds derive from the RESOLVED
noise seed + fixed offsets (7101/7207/7303) — no config knob. Apply is
per-column with all modulated values as pure parameters (D-035); the
classify path never sees them.

Monotonicity assertion now sweeps all 8 modulation-extreme corners x
per-seed spikeMax. TerrainCurve gate "off"|"v4" (default v4);
v1-v3 retired loudly. TCRV extended (+36 B when version>=4:
amplitudes, span range, frequencies, seed offsets — length-framed
section makes the layout change safe; parser dispatches on the curve
version byte; harness compares the extension).

Note: MapGenerator.cs also carries the developer's editor whitespace
normalization (spaces->tabs, git diff -w empty before this change).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Stewart Howe 2026-08-08 03:30:27 -04:00
parent a046486a58
commit 4d2e024b2f
6 changed files with 292 additions and 183 deletions
Download patch file Download diff file Expand all files Collapse all files

8
Tools/Scripts/RoundTripHarness.cs
View file

@ -200,8 +200,12 @@ public partial class RoundTripHarness : Node
}
var ca = a.TerrainCurve; var cb = b.TerrainCurve;
bool same = ca.Version == cb.Version;
float[] fa = { ca.T1, ca.T2, ca.T3, ca.T4, ca.SpikeMax, ca.Sea, ca.OrangeCeil, ca.RedCeil, ca.PlateauLo, ca.PlateauHi, ca.PeakCap, ca.TailSlope };
float[] fb = { cb.T1, cb.T2, cb.T3, cb.T4, cb.SpikeMax, cb.Sea, cb.OrangeCeil, cb.RedCeil, cb.PlateauLo, cb.PlateauHi, cb.PeakCap, cb.TailSlope };
float[] fa = { ca.T1, ca.T2, ca.T3, ca.T4, ca.SpikeMax, ca.Sea, ca.OrangeCeil, ca.RedCeil, ca.PlateauLo, ca.PlateauHi, ca.PeakCap, ca.TailSlope,
ca.BenchAmp, ca.PlateauAmp, ca.ShelfSpanMin, ca.ShelfSpanMax, ca.ElevFreqIslands, ca.StrengthFreqIslands,
ca.BenchSeedOffset, ca.PlateauSeedOffset, ca.StrengthSeedOffset };
float[] fb = { cb.T1, cb.T2, cb.T3, cb.T4, cb.SpikeMax, cb.Sea, cb.OrangeCeil, cb.RedCeil, cb.PlateauLo, cb.PlateauHi, cb.PeakCap, cb.TailSlope,
cb.BenchAmp, cb.PlateauAmp, cb.ShelfSpanMin, cb.ShelfSpanMax, cb.ElevFreqIslands, cb.StrengthFreqIslands,
cb.BenchSeedOffset, cb.PlateauSeedOffset, cb.StrengthSeedOffset };
for (int i = 0; i < fa.Length; i++)
if (System.BitConverter.SingleToInt32Bits(fa[i]) != System.BitConverter.SingleToInt32Bits(fb[i])) same = false;
if (!same) { GD.PrintErr("[Harness] TCRV fields differ."); return false; }