Phase 2 of the D-243 re-scale. The ~1km carrier is renamed and re-scaled to
the 2km district, and every consumer reads scale from the canonical scale.rs
instead of a local literal.
- region_profile.rs -> district_profile.rs; RegionProfile -> DistrictProfile,
RegionPos -> DistrictPos (re-exported from scale::DistrictPos), derive_*_regions
-> derive_*_districts, across all 10 consumers + the derivation harness.
- chunk_context now references scale:: for the carrier cell: district 1024m -> 2048m,
shift 4 -> 5 (CHUNK_DISTRICT_SHIFT). This caught a real latent bug: the seed-district
index used a literal '>> 4' while the anchor used the constant, so same-district
chunks could derive different anchors — now both use scale::CHUNK_DISTRICT_SHIFT.
- derivation_harness scale literals ('>> 4', '* 1024', '0..16') converted to
scale:: constants (the same drift the canonical source eliminates). Believability
tests pass at 2km; the voxel determinism golden re-pinned (anchors moved with the
re-scale — deterministic, intended).
Full suite + clippy --all-targets -D warnings green. The district DERIVATION still
tiles the heightmap at 8 cells (the old coarse path); replacing it with on-demand
heightmap interpolation + detail-scatter is phase 3.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
derive_chunk_context now derives channel_anchor_m and coast_anchor_m from
the Region-or-higher seed path (D-239 §10); all five voxel placement sites
measure distance to these anchors in continuous world coordinates:
- T-1040: compute_channel_state / compute_meander_reach_channel /
in_levee_band subtract the region anchor instead of measuring from the
world origin axis — active channels now exist in their chunks anywhere
on the body, continuous across chunk boundaries. has_active_channel is
honest in both directions (band-crossing gate; floor covers the
BraidedDelta belt at short wavelengths).
- T-1041: fjord/cliff/gorge/delta drop their rem_euclid(64) chunk-frame
folds — one valley/coastline/fan per region instead of one per chunk.
D-239 §9 chokepoint widths preserved; two i32 wall-rise overflows on
region-scale distances fixed by clamping before multiply.
Harness: 6 new believability tests (channel presence + gate honesty at
chunk (1000,-750), cross-boundary continuity, one-landform-per-region,
braid-belt confinement); drainage sweeps strengthened with anchor-band
chunks. Voxel golden regenerated deliberately: case A now pins a genuinely
in-channel Shallow voxel on the anchor, case C a Deep trough voxel
matching its label; case B byte-identical and L0/L1 cascade golden
untouched (no upstream leak). Review: approved, three minors addressed
(truncation-convention docs, delta gate floor, case C relocation).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Hoshe review findings — close silent-pass gaps in the §8 drainage tests:
- assert_drainage_monotonicity now returns whether it actually checked (chunk
had both wet and dry tiles); the three sweep tests (Alluvial/Meander/Braided
Delta) assert at least one chunk exercised the law, so a regression that
zeroes all channels fails loudly instead of passing vacuously.
- The fjord-floor test scans the full 64x64 chunk instead of a single Y=32 row
and asserts the deep-water trough exists, so the sea-level floor law can no
longer be skipped by a probe that missed the trough.
- Remove the unreferenced make_test_terrain_analysis helper (was behind
#[allow(dead_code)] with a 'future use' comment — the maintenance trap the
review flagged); make_dry_terrain_analysis covers the validation bodies.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Adapt the believability/budget verification harness to the T-1033 BodyParams
strip: validation-body fixtures (Kallast/Glødberg/Marevna) no longer set the
removed orbit/star fields (orbital_period_days, axial_tilt_deg, spectral_class,
star_type). Temperature is now derived from the planet_class envelope (D-240),
so the Marevna validation note/assertion is rewritten — oceanic band [-12,28]°C
+ maritime 0.6 + standard-atmosphere greenhouse yields ~+26°C at the equator
(was a stale ~-56°C orbit-equilibrium note). Add the seed→tile golden fixture
(tests/golden/derivation_harness.json) that the determinism regression locks.
Also fmt the harness and fix one clippy lint (iter().copied().collect() ->
to_vec()) — the file predated the pre-push gate's cargo-test/clippy coverage.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8