The seeded floor from chat2/05 — FloorNorth/FloorSouth, the PCG32 placement, StampWeight,
StampRadiusFrac/StampCoreFrac/StampEdgeJitter, the centre separation and land gap, the
floor self-check and oracle (h), the centre rings on the tag overlay — is reverted out
whole, as a forward commit. It looked stamped. It is one checkout away at 3b96e06. What
remains is ONE island mechanism: the organic noise-field layer, with chat2/05 stage 2's
shape untouched (freq 16, crest 24 m pre-curve, core 0.25, sharpness 2.5, corners on,
moat + falloff test + outer bound unmoved), now OffshoreSettings.Organic(). The count per
hemisphere is a statistical outcome of the tuning, read off a table, never guaranteed.
The south was measured before anything moved (OffshoreDiagnosis, over task 01's pool at
2048): the premise that the south generates fewer islands is not what the field says.
The NORTH has 1.75x less island-eligible ocean (56 % of its ocean is zone vs 69 %; 233
zone rows per column vs 407) and under half the island candidates (1,183 over-threshold
peaks in zone vs 2,422). Per cell the south is richer too (484 vs 414 candidates per
Mcell). The gate that loses candidates is the moat in the north and the falloff test in
the south — the bulging south coast pushes the 0.72 contour out — but neither binds
enough to suppress it. So the fix is density, and the binding constraint for "a couple
north, consistently" is the north.
The knobs: Density (the main one, the calibration quantile) and SouthWeight (south density
= Density x weight — applied to the quantile, so a south island looks exactly like a north
one; there are just more). Three levels batched on 12 seeds at 4096, SouthWeight 1.25:
0.016 N 2/4.4/10 S 8/13.8/21 (every seed clears N >= 2, S >= 3, but N's minimum IS 2),
0.022 N 3/6.3/12 S 15/19.9/29 (the preset — the first level whose north minimum sits
comfortably above the target), 0.030 N 3/7.8/15 S 19/25.2/33 (the too-many bookend). The
south weight is the developer's stated preference, not a fix; the SouthWeight 1.0 tables
(S 6/10.9/16 at 0.022) are in the batch's scratch/ for the comparison.
The guards, so more density does not buy slop, each a revert by component membership:
specks (< 3e-5 of the map's area, ~500 cells at 4096 — 70-100 per field at these
densities, the noise caps the reference also surfaced), clusters (the smaller of two
islands whose shores are within 0.8 % of the map width — 0-7 per field), blobs (> 6e-4 —
never bit). And the reference's submerged humps, now attributed by HUMP rather than by
bounding box: the first 4096 plate probe showed hollow ghost rings beside islands — a
guard-dropped island's cap went back to seabed but its rim survived inside its
neighbour's bbox keep-region. A hump (one connected raised region) now stays only if it
holds a kept island, and a dropped island's own cap goes even inside a kept hump.
Oracle, all passing: a1 (Phase-1 dump), a3 (task-03 dump), a4 NEW — offshore OFF at 8192
bit-identical to the terrain-curve-v1 tag's own 04 gallery dump over 67,108,864 cells —
j0 shelf inert on land, and per field moat / mainland unmoved / tag-coastline / HMaxSeed
(unchanged, 1.289169) / classify on all 36 table fields and 4 plates. Batch:
BatchRoot(6, "offshore_organic_tune") — exactly 4 plates (three densities on 1063685222,
density_mid on 424242, the table's sparsest south) + count_table.md/.csv + diagnosis.md.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013EY3ZTF6NwzF8ukBHQXSK7
