Batch 10_detail_edge measured 532 new below-sea pixels on seed
1158286446 and 44 on 72563200 -- exported terrain under the sea scalar
that the water grid (classify-driven, and correctly identical) calls dry.
Located: every one of them strictly inside the crater's physical carve
radius, 201-323 px out of 640.
Mechanism, confirmed against the data: detail moves a column's PRE-carve
height, and the carve is Lerp(curvedH, target, t). At t ~ 0.45-0.62 a
pre-carve drop of up to 8.4 m (relief plus the band-shift the warp
implies) still passes 0.02-3.53 m through, which is enough to push a
column sitting 0-3.45 m above the sea inside the bowl under it.
The crater carve is supposed to be the FINAL authority on its own
terrain, so detail now yields to it: CraterDetailWeight is 0 inside
0.80 x CraterRadius (exactly the carve's own radius) and feathers to
full by 1.05 x, scaling both the edge shift and the relief skin. Inside
the carve, B is bit-identical to A by construction, so the count is zero
rather than small. The reverted incision pass carried the same exclusion
for the same reason -- the principle outlived the pass that motivated it.
Re-running the 6 B_detail generations; A_off and the continuity run are
untouched by a detail-only change.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Sized from measurement, not taste-first. |grad raw| at the K3/K4/K5
contours on seed 1375359975 is p50 0.00088 raw/px, so the first try (5 m,
12 undulations/island) displaced the shelf boundary a MEAN of 3.7 px with
a roughness ratio of 1.03 -- real, and invisible at map scale. At 12 m
and 20/island the boundary moves a mean 8.4 px (bench) / 9.1 px
(plateau), roughness ratio 1.09, and the outline grows the notches, coves
and peninsulas the sketch asked for.
Measured cost at 12 m (A off vs B, same seed): lowland and toe/red bands
bit-identical in both pixel count and slope -- the K2 pin holding exactly,
as designed. Foothill riser p50 0.681 -> 0.676 m/px, p90 1.445 -> 1.478,
max 3.09 -> 3.81. Bench p50 0.21 -> 0.232 (micro-relief included), still
buildable. Peaks max identical at 6.55.
Safety bound restated from "half the margin to a fixed knot" to 2/3 of
the smaller adjacent band, which is the constraint that actually matters:
the squeezed band never compresses below a third of its nominal width, so
its slope never more than triples. That puts the ceiling at 16.45 m for
the v5 knots and leaves the 12 m default real headroom if the gate says
"more".
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
PASS B, replacing the reverted incision. The developer's sketch asked for
the shelf/riser BOUNDARY to be organic, not for water: notches, coves and
small peninsulas where a flat shelf meets its riser, instead of the clean
oval contour the curve produces.
Mechanism (the task's preferred "boundary warp", in its most
monotonic-safe form): every shelf/riser boundary is the contour where the
raw height crosses K3, K4 or K5, so the boundary is warped by SLIDING
THOSE THREE KNOTS per column -- edgeShift = simplex(resolvedSeed + 7507,
12 per island width) x ShelfEdgeVariation. The contours then wander in and
out of the terrain instead of tracing an iso-height line. Noise-warped by
construction, so there is no grid direction for an artifact to line up on
-- the failure mode of the thing this replaces.
Why slide knots rather than perturb a weight or the input height:
monotonicity becomes structural instead of conditional. The curve is
strictly monotonic for ANY ordered knot set, so no derivative bound, no
amplitude-vs-feather-width tuning, no way for a dial to invert a column.
MaxEdgeShift keeps the set ordered (half the smallest margin to a fixed
knot = 12.3 m of input height for the v5 knots); the config dial is
clamped to it, loudly. AssertMonotonic now sweeps 24 corners -- the 8
modulation extremes x {-max, 0, +max} shift -- and checks the bound first.
K1, K2 and K6 never move, which buys the guarantees exactly rather than
statistically: below K2 and above K6 a warped column is bit-identical to
an unwarped one, so the red ceiling still floors every shelf edge (storm
ladder safe), the 420 m cap still caps, and the toe and summit spikes are
untouched. The block slides rigidly, so the bench and mid-riser keep their
exact widths -- shelf interiors stay flat, riser interiors keep their
profile, and only the foothill riser and plateau stretch to absorb it.
The micro-relief mask takes the same shift, so pass A's skin follows the
shelf wherever pass B moved its edge.
Dial ShelfEdgeVariation (default 5 m of INPUT height -- a boundary
displacement, not an elevation change) under the existing TerrainDetail
gate; both passes stay one judged unit. TDTL v2 body records relief and
edge amp/frequency/seed-offset plus the applied clamp bound; writer,
parser and harness follow. No blueprint was written between the revert
and this commit, so v2 only ever means relief + edge warp on disk.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The task-10 draft's PASS B shipped and produced the canonical grid
artifact: thousands of straight, disconnected, pooling scratches. Per-
cell steepest descent on a regular grid can only route along its eight
neighbour headings, so at map scale the "channels" read as hatching,
not drainage. Reverted entirely rather than tuned -- no K, p or mask
setting fixes a directional basis. Rivers and erosion move to Phase C
as a hydraulic-erosion pass over FINAL terrain.
Removed: FlowAccumulation / IncisionWeight / EdgeBlend and the INC_*,
SEA_CLAMP, SHELF_INC_WEIGHT and CRATER_* constants; RunIncisionPass and
the pass-2b call; the six incision fields from TDTL (writer, parser,
harness). KEPT, untouched and developer-approved: pass A, the shelf
micro-relief skin, and its ShelfReliefAmp dial.
The crater carve folds back into the single pass-2 loop it came from,
carving two LOCALS written once each. That is what the code did before
the draft split it out, and it makes the aliased double-carve that the
split introduced (fix 1b98fb5) structurally impossible rather than
merely fixed -- there is no longer a read-modify-write to get wrong.
TDTL bodies are now versioned (BlueprintFormat.TDTL_VERSION = 2) and the
parser skips a body version it does not know instead of misreading the
longer v1 layout into plausible nonsense. The only v1 payloads that
exist are in the reverted batch's own tree.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
First tuning run (seed 1375359975): p50 2.3 / p90 6.1 / p99 13.6 / max
30.0 m — typical gullies under the 8-15 m target. K=1.40 confirmed:
p50 3.3 / p90 10.2 / p99 22.9 / max 30.0, zero sea-clamp hits.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Two paired detail passes on the locked v5 skeleton, output-heights
only (classify path untouched):
PASS A — shelf micro-relief: +-ShelfReliefAmp (default 3 m) Simplex
skin (seed resolved+7409, ~40 undulations/island ~ 200 m features),
weighted by shelf-ness (full mid-shelf, feathered to zero 30% of a
band half-width into the risers) — both shelves get their rolling
texture back; risers and peaks untouched.
PASS B — drainage incision: D8 steepest-descent routing + height-
ordered flow accumulation over the curved+relieved land
(TerrainDetailPass — pure array machinery, named C++ candidate per
D-035); depth = K*accum^p*slope (K=0.78, p=0.45 concave, cap 30 m),
masked full on risers / 30% on shelves / zero on the toe, above the
plateau top, and within 1.2x CraterRadius (feathered to 1.4x); hard
clamp: carved height >= sea + 1 m. Ordering: curve -> relief ->
incision -> crater carve (the carve stays the final authority; carve
moved to its own pass 2c, bit-identical expression on both maps).
The pass prints its own MEASURED depth distribution.
Gate TerrainDetail "off"|"v1" (default v1; both passes one judged
unit; no-op without the curve) + ShelfReliefAmp dial. New TDTL section
(38 B: version + relief/incision params + seed offset) across
writer/parser/harness — blueprints stay self-describing.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
