fix(simulation): address believability-stack review — all findings processed
Stack review (Hoshe + Tyre) of T-1083+T-1082+T-1080. Every finding fixed or disposed: - believability.rs sample_indices: replace the rejection-sampling loop (could stall when n ≈ take) with deterministic partial Fisher-Yates — O(n), guaranteed termination, distinct, sorted (Hoshe+Tyre). - believability.rs drainage proxy: exclude water-body districts (all elev 0, no banks) and require both wet + dry voxels — they were passing vacuously and inflating the metric (Hoshe). - believability.rs read_cities: log skipped malformed rows instead of dropping silently (Hoshe). - voxel.rs: add the 3 WaterBody zones to all_families_no_panic_at_extreme_positions + fix the "7 families" comment (Hoshe). - climate_constants.toml: bold warning that [moisture_gradient] is not loaded until T-1032 — tune ClimateConstants::default() (Tyre). - Q-123: record the per-zone "water renders wet" threshold + the land-relative vegetation-present denominator as calibration items (Tyre + the open 7th criterion). - T-1083 ticket: note the sampling-fix attribution (landed in the T-1082 commit). Believability golden regenerated (sampler + drainage fixes moved the metrics). clippy --all-targets -D warnings clean; 1580 lib tests + harness pass. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Claude Opus 4.8
@@ -2739,3 +2739,32 @@ TUNING: add [moisture_gradient] to server/data/climate_constants.toml + matching
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DETERMINISM: integer (water_dist u16, integer division, clamp 0..100). D-010 ok.
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VERIFY: believability harness gate moisture_q.distinct>=3 flips FAIL→PASS; vegetation-present should rise too. Magnitude calibration is Q-123 (provisional coefficients now). Files: district_profile.rs, climate_constants.toml.', NULL, '2026-06-28 13:50:47', '2026-06-28 13:50:47.912', '2026-06-28 13:50:47.912', NULL, '47bb1324b99af91b19f50ee8f8d3825a', 2) ON CONFLICT(hash) DO NOTHING;
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INSERT INTO ticket_history (ticket_record_id, field, old_value, new_value, changed_by, changed_at, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06FGSJZG3WFPQ3VXBFQFM4YEWW', 'description', 'Promote the throwaway probe (server/src/bin/aliveness_probe.rs) into a committed, repeatable believability test protocol — the instrument that found T-1080/T-1081/T-1082. For a body+seed it runs the deterministic cascade and emits: (1) cross-district CONTRAST/variance metrics — moisture, elevation/relief, slope, morphology-zone diversity, terrain-material diversity, vegetation gradient — the screen that catches ''uniform/dead'' worlds; (2) COHERENCE checks with pass/fail — water zones must render wet, vegetation must correlate with moisture/water-distance/slope/aspect, drainage monotonic; (3) optional per-layer PNG maps (a stopgap for the T-960 Atlas viewer). LESSON BAKED IN: the first naive ''is it vegetated'' metric reported a broken uniform world as ALIVE — so the protocol MUST measure CONTRAST + COHERENCE across samples, never marginal per-tile counts. Make it runnable per-body, deterministic (string seed -> u64), snapshot a baseline for regression. This is the D-245 ENFORCER. NOTE: today it samples at the DISTRICT tier because no production code maps a world chunk -> covering DistrictProfile yet (voxel layer is a walking skeleton). Distinct from T-1031 (binding-LAW harness); believability sibling. Relates to T-960.
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---
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Implemented 2026-06-28 (branch believability-harness).
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- server/src/atlas/believability.rs (new): the enforcer core. BelievabilityReport (serde, golden-able) + analyze() = CONTRAST (per-field min/max/distinct over ALL districts for moisture/elev/slope/ocean; distinct morphology-zones/vegetation-classes/terrain-materials) + COHERENCE (water-renders-wet [T-1082], drainage-monotonic, vegetation-present). evaluate_criteria() = advisory D-245 checks (thresholds Q-123-TBD). cascade_for_body()/seed_to_u64() loader shared by bin + harness. Unit tests prove the metric distinguishes uniform (fails) vs varied (passes) — the ''never marginal per-tile counts'' lesson — + determinism.
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- server/src/bin/aliveness_probe.rs: refactored to a thin CLI over the module; prints the body-level report + advisory D-245 criteria; dropped the naive per-tile ''reads ALIVE'' verdict.
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- server/tests/believability_harness.rs (+ tests/golden/believability.json): real cascade for Arbour (temperate/ocean) + Edict (frozen/ice); determinism assert; golden regression (updates when T-1080/T-1082 land); BELIEVABILITY_STRICT=1 fails on unmet criteria. Skips if data absent. x86_64 golden.
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BASELINE @ believability-v1: Arbour 3/7, Edict 3/7. FAIL: moisture gradient (distinct=1, T-1080), water-renders-wet (T-1082), drainage-monotonic. Edict vegetation 0/64 = blank tundra (the frozen ''reads dead'' case). PASS: elevation relief, morphology variety, vegetation-present (Arbour only).
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DEFERRED (ticket item 3 — explicitly optional): per-layer PNG maps (the T-960 Atlas-viewer stopgap). The contrast+coherence metrics are the core enforcer; maps are a follow-up if the human-gate review wants them before T-960.
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This is the D-245 enforcer; advisory now, ratchets to strict (BELIEVABILITY_STRICT) once Q-123 calibrates thresholds and T-1080/1081/1082 flip the criteria.', 'Promote the throwaway probe (server/src/bin/aliveness_probe.rs) into a committed, repeatable believability test protocol — the instrument that found T-1080/T-1081/T-1082. For a body+seed it runs the deterministic cascade and emits: (1) cross-district CONTRAST/variance metrics — moisture, elevation/relief, slope, morphology-zone diversity, terrain-material diversity, vegetation gradient — the screen that catches ''uniform/dead'' worlds; (2) COHERENCE checks with pass/fail — water zones must render wet, vegetation must correlate with moisture/water-distance/slope/aspect, drainage monotonic; (3) optional per-layer PNG maps (a stopgap for the T-960 Atlas viewer). LESSON BAKED IN: the first naive ''is it vegetated'' metric reported a broken uniform world as ALIVE — so the protocol MUST measure CONTRAST + COHERENCE across samples, never marginal per-tile counts. Make it runnable per-body, deterministic (string seed -> u64), snapshot a baseline for regression. This is the D-245 ENFORCER. NOTE: today it samples at the DISTRICT tier because no production code maps a world chunk -> covering DistrictProfile yet (voxel layer is a walking skeleton). Distinct from T-1031 (binding-LAW harness); believability sibling. Relates to T-960.
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---
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Implemented 2026-06-28 (branch believability-harness).
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- server/src/atlas/believability.rs (new): the enforcer core. BelievabilityReport (serde, golden-able) + analyze() = CONTRAST (per-field min/max/distinct over ALL districts for moisture/elev/slope/ocean; distinct morphology-zones/vegetation-classes/terrain-materials) + COHERENCE (water-renders-wet [T-1082], drainage-monotonic, vegetation-present). evaluate_criteria() = advisory D-245 checks (thresholds Q-123-TBD). cascade_for_body()/seed_to_u64() loader shared by bin + harness. Unit tests prove the metric distinguishes uniform (fails) vs varied (passes) — the ''never marginal per-tile counts'' lesson — + determinism.
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- server/src/bin/aliveness_probe.rs: refactored to a thin CLI over the module; prints the body-level report + advisory D-245 criteria; dropped the naive per-tile ''reads ALIVE'' verdict.
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- server/tests/believability_harness.rs (+ tests/golden/believability.json): real cascade for Arbour (temperate/ocean) + Edict (frozen/ice); determinism assert; golden regression (updates when T-1080/T-1082 land); BELIEVABILITY_STRICT=1 fails on unmet criteria. Skips if data absent. x86_64 golden.
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BASELINE @ believability-v1: Arbour 3/7, Edict 3/7. FAIL: moisture gradient (distinct=1, T-1080), water-renders-wet (T-1082), drainage-monotonic. Edict vegetation 0/64 = blank tundra (the frozen ''reads dead'' case). PASS: elevation relief, morphology variety, vegetation-present (Arbour only).
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DEFERRED (ticket item 3 — explicitly optional): per-layer PNG maps (the T-960 Atlas-viewer stopgap). The contrast+coherence metrics are the core enforcer; maps are a follow-up if the human-gate review wants them before T-960.
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This is the D-245 enforcer; advisory now, ratchets to strict (BELIEVABILITY_STRICT) once Q-123 calibrates thresholds and T-1080/1081/1082 flip the criteria.
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Stack-review note (2026-06-28): the believability sampling-bias fix (contiguous-prefix -> seeded Fisher-Yates spread in sample_indices) is logically a T-1083 enforcer-correctness fix but landed in the T-1082 commit cdc55032d (found while verifying T-1082). git history records it accurately under the water-body work; flagged so a bisect lands in the expected place. The Fisher-Yates termination fix + drainage-proxy exclusion of water districts (stack review) are in the T-1080 review-fix commit.', NULL, '2026-06-28 15:38:18', '2026-06-28 15:38:18.309', '2026-06-28 15:38:18.309', NULL, '4b9f44267a786f912a1d4744ee1aa36b', 2) ON CONFLICT(hash) DO NOTHING;
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@@ -3672,3 +3672,19 @@ TUNING: add [moisture_gradient] to server/data/climate_constants.toml + matching
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DETERMINISM: integer (water_dist u16, integer division, clamp 0..100). D-010 ok.
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VERIFY: believability harness gate moisture_q.distinct>=3 flips FAIL→PASS; vegetation-present should rise too. Magnitude calibration is Q-123 (provisional coefficients now). Files: district_profile.rs, climate_constants.toml.', 'in_progress', 'high', NULL, 'server', 'D-239', '2026-06-28 05:54:42.258', '2026-06-28 13:50:47.912', NULL, '4f5ee94f5fd8f5e447968619a520f915', 2) ON CONFLICT(record_id) DO UPDATE SET type=excluded.type, parent_record_id=excluded.parent_record_id, title=excluded.title, description=excluded.description, status=excluded.status, priority=excluded.priority, assigned_to=excluded.assigned_to, team=excluded.team, decision_ref=excluded.decision_ref, updated_at=excluded.updated_at, deleted_at=excluded.deleted_at, hash=excluded.hash, canonical_version=excluded.canonical_version WHERE excluded.updated_at > tickets.updated_at OR (excluded.updated_at = tickets.updated_at AND excluded.hash > tickets.hash);
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INSERT INTO tickets (record_id, type, parent_record_id, title, description, status, priority, assigned_to, team, decision_ref, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06FGSJZG3WFPQ3VXBFQFM4YEWW', 'story', '06FGSJNP8YM537DJCC82ZD6544', 'Repeatable believability test protocol — cross-district contrast + coherence metrics (promote aliveness_probe)', 'Promote the throwaway probe (server/src/bin/aliveness_probe.rs) into a committed, repeatable believability test protocol — the instrument that found T-1080/T-1081/T-1082. For a body+seed it runs the deterministic cascade and emits: (1) cross-district CONTRAST/variance metrics — moisture, elevation/relief, slope, morphology-zone diversity, terrain-material diversity, vegetation gradient — the screen that catches ''uniform/dead'' worlds; (2) COHERENCE checks with pass/fail — water zones must render wet, vegetation must correlate with moisture/water-distance/slope/aspect, drainage monotonic; (3) optional per-layer PNG maps (a stopgap for the T-960 Atlas viewer). LESSON BAKED IN: the first naive ''is it vegetated'' metric reported a broken uniform world as ALIVE — so the protocol MUST measure CONTRAST + COHERENCE across samples, never marginal per-tile counts. Make it runnable per-body, deterministic (string seed -> u64), snapshot a baseline for regression. This is the D-245 ENFORCER. NOTE: today it samples at the DISTRICT tier because no production code maps a world chunk -> covering DistrictProfile yet (voxel layer is a walking skeleton). Distinct from T-1031 (binding-LAW harness); believability sibling. Relates to T-960.
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||||
---
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Implemented 2026-06-28 (branch believability-harness).
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||||
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- server/src/atlas/believability.rs (new): the enforcer core. BelievabilityReport (serde, golden-able) + analyze() = CONTRAST (per-field min/max/distinct over ALL districts for moisture/elev/slope/ocean; distinct morphology-zones/vegetation-classes/terrain-materials) + COHERENCE (water-renders-wet [T-1082], drainage-monotonic, vegetation-present). evaluate_criteria() = advisory D-245 checks (thresholds Q-123-TBD). cascade_for_body()/seed_to_u64() loader shared by bin + harness. Unit tests prove the metric distinguishes uniform (fails) vs varied (passes) — the ''never marginal per-tile counts'' lesson — + determinism.
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||||
- server/src/bin/aliveness_probe.rs: refactored to a thin CLI over the module; prints the body-level report + advisory D-245 criteria; dropped the naive per-tile ''reads ALIVE'' verdict.
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- server/tests/believability_harness.rs (+ tests/golden/believability.json): real cascade for Arbour (temperate/ocean) + Edict (frozen/ice); determinism assert; golden regression (updates when T-1080/T-1082 land); BELIEVABILITY_STRICT=1 fails on unmet criteria. Skips if data absent. x86_64 golden.
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BASELINE @ believability-v1: Arbour 3/7, Edict 3/7. FAIL: moisture gradient (distinct=1, T-1080), water-renders-wet (T-1082), drainage-monotonic. Edict vegetation 0/64 = blank tundra (the frozen ''reads dead'' case). PASS: elevation relief, morphology variety, vegetation-present (Arbour only).
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DEFERRED (ticket item 3 — explicitly optional): per-layer PNG maps (the T-960 Atlas-viewer stopgap). The contrast+coherence metrics are the core enforcer; maps are a follow-up if the human-gate review wants them before T-960.
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||||
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This is the D-245 enforcer; advisory now, ratchets to strict (BELIEVABILITY_STRICT) once Q-123 calibrates thresholds and T-1080/1081/1082 flip the criteria.
|
||||
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Stack-review note (2026-06-28): the believability sampling-bias fix (contiguous-prefix -> seeded Fisher-Yates spread in sample_indices) is logically a T-1083 enforcer-correctness fix but landed in the T-1082 commit cdc55032d (found while verifying T-1082). git history records it accurately under the water-body work; flagged so a bisect lands in the expected place. The Fisher-Yates termination fix + drainage-proxy exclusion of water districts (stack review) are in the T-1080 review-fix commit.', 'in_progress', 'high', NULL, 'server', 'D-239', '2026-06-28 05:55:19.712', '2026-06-28 15:38:18.308', NULL, '0b6572cca4a24c9658cf4751d7573add', 2) ON CONFLICT(record_id) DO UPDATE SET type=excluded.type, parent_record_id=excluded.parent_record_id, title=excluded.title, description=excluded.description, status=excluded.status, priority=excluded.priority, assigned_to=excluded.assigned_to, team=excluded.team, decision_ref=excluded.decision_ref, updated_at=excluded.updated_at, deleted_at=excluded.deleted_at, hash=excluded.hash, canonical_version=excluded.canonical_version WHERE excluded.updated_at > tickets.updated_at OR (excluded.updated_at = tickets.updated_at AND excluded.hash > tickets.hash);
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@@ -478,7 +478,7 @@ Technical foundation questions: engine, protocols, data structures, performance,
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2. **Non-stationarity** — the similarity metric for "two same-class km² differ" (histogram distance / feature-vector cosine) and the *minimum* dissimilarity that counts as non-repeating; plus a tile-period autocorrelation ceiling (the Netherlands "no two km² alike" rule, made numeric).
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3. **Intra-class variety** — minimum distinct micro-features per sampled patch (K), per terrain class (T-1084).
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4. **Relief floor** — minimum relief variance, *conditioned on the macro terrain's expectation* (a plain's floor ≠ a montane floor) (T-1081).
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5. **Coherence** — the vegetation ↔ (moisture / water-distance / slope / aspect) correlation floor; the water-zone-renders-wet check (T-1082); the allowed "impossible combo" set (should be empty).
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5. **Coherence** — the vegetation ↔ (moisture / water-distance / slope / aspect) correlation floor; the water-zone-renders-wet check (T-1082); the allowed "impossible combo" set (should be empty). *(T-1082 review note: the current 50% "water renders wet" floor is weak for ocean-dominant bodies — calibrate it **per zone**: post-T-1082 an `OpenOcean` district should render wet ~100% (Dry is impossible), while a mixed coastal district may legitimately read partial.)* Also calibrate the **vegetation-present** denominator: dividing by *all* sampled districts (incl. water) makes the criterion structurally unreachable for a 2/3-ocean world — it should be **land-relative** (exclude water-body districts).
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6. **Climate-appropriateness** — how "*structured-sparse* passes / *blank* fails" is measured on cold/arid bodies, so a frozen world is not failed for being legitimately sparse.
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7. **Pass budget + ratchet** — the % of land probes that must pass to ship (budgeted), and the trigger to ratchet advisory → strict (hard push-gate block).
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- **Cross-reference:** [D-245](../decisions/architecture.md#d-245-nature-layer-believability-acceptance-gate) (the gate this calibrates), [D-239](../decisions/architecture.md#d-239) §8/§10 (laws + budget), [D-227](../decisions/architecture.md#d-227), [D-243](../decisions/architecture.md#d-243); tickets T-1083 (enforcer — produces the baselines), T-1079 (epic), T-1080/T-1081/T-1082/T-1084.
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@@ -87,6 +87,10 @@ subsurface_ice = 0.95
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# ---------------------------------------------------------------------------
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[moisture_gradient]
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# !! NOT LOADED AT RUNTIME until T-1032 wires TOML loading. The LIVE source is
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# !! ClimateConstants::default() in server/src/atlas/district_profile.rs — editing
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# !! these values here alone has NO effect (the file header's "tune: edit here"
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# !! does not yet apply to this table). Change BOTH, or change the Rust default.
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# Per-district moisture spatial gradient (T-1080, D-239 §2). Integer points
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# subtracted from the body's hydrosphere moisture *ceiling* so the field varies
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# across the body instead of being a single constant (the bug: moisture_q = 80 for
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@@ -230,14 +230,15 @@ pub fn analyze(
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coh.vegetated_districts += 1;
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}
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// Drainage monotonicity (active-channel districts): a channel must render wet
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// AND its water must sit at/below the dry-land mean elevation. A district whose
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// channel renders no water (the T-1082 failure) fails this too — vacuously
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// non-monotonic, which is the believability-correct verdict.
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if ctx.has_active_channel {
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// Drainage monotonicity — LAND channels only (a river must sit at/below its
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// banks). Water-body districts (ocean/lake/tidal) are all-wet at sea level with
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// no dry banks, so they are excluded: counting them would pass the check
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// vacuously (dry_n == 0) and inflate the metric. The check therefore requires
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// both wet channel voxels AND dry bank voxels in the sample.
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if ctx.has_active_channel && prof.ocean_fraction_q < WATER_PRESENCE_Q {
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coh.drainage_samples += 1;
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let wet_below_land =
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wet_n > 0 && (dry_n == 0 || wet_elev_sum / wet_n <= dry_elev_sum / dry_n.max(1));
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wet_n > 0 && dry_n > 0 && wet_elev_sum / wet_n <= dry_elev_sum / dry_n;
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if wet_below_land {
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coh.drainage_monotonic += 1;
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}
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@@ -348,27 +349,33 @@ fn district_centre_chunk(dp: DistrictPos) -> ChunkPos {
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)
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}
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/// Deterministic seeded spread of up to `take` distinct indices in `0..n` — a
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/// reproducible "random" sample across the whole district list (D-245's
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/// randomly-sampled-anywhere requirement), unbiased unlike a contiguous prefix.
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/// Returns all of `0..n` when `n <= take`. splitmix64 mixing keyed on the world seed.
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/// Deterministic seeded spread of `take` distinct indices in `0..n` — a reproducible
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/// "random" sample across the whole district list (D-245's randomly-sampled-anywhere
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/// requirement), unbiased unlike a contiguous prefix. Returns all of `0..n` when
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/// `n <= take`.
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///
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/// Partial Fisher-Yates over a splitmix64 stream keyed on the world seed: O(n),
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/// **guaranteed to terminate**, distinct by construction, sorted for stable
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/// (BTreeMap-order) consumption. (A rejection-sampling loop would stall as `n → take`,
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/// since splitmix64 output is not a permutation — the hazard this replaces.)
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fn sample_indices(world_seed: u64, n: usize, take: usize) -> Vec<usize> {
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if n <= take {
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return (0..n).collect();
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}
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let mut picked: BTreeSet<usize> = BTreeSet::new();
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let mut i: u64 = 0;
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while picked.len() < take {
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let mut z = world_seed
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.wrapping_add(i)
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.wrapping_add(0x9E37_79B9_7F4A_7C15);
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let mut idx: Vec<usize> = (0..n).collect();
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let mut state = world_seed;
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for i in 0..take {
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state = state.wrapping_add(0x9E37_79B9_7F4A_7C15);
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let mut z = state;
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z = (z ^ (z >> 30)).wrapping_mul(0xBF58_476D_1CE4_E5B9);
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z = (z ^ (z >> 27)).wrapping_mul(0x94D0_49BB_1331_11EB);
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z ^= z >> 31;
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picked.insert((z % n as u64) as usize);
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i += 1;
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let j = i + (z % (n - i) as u64) as usize;
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idx.swap(i, j);
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}
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picked.into_iter().collect()
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let mut chosen = idx[..take].to_vec();
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chosen.sort_unstable();
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chosen
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}
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// ---------------------------------------------------------------------------
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@@ -448,7 +455,14 @@ fn read_cities(db: &PathBuf, body_id: &str) -> Result<Vec<CityRecord>, String> {
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})
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})
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.map_err(|e| format!("city query: {e}"))?
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.filter_map(Result::ok)
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.filter_map(|r| match r {
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Ok(c) => Some(c),
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Err(e) => {
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// A dropped city changes downstream placements, so never drop silently.
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eprintln!("[believability] skipped a malformed city row for {body_id}: {e}");
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None
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}
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})
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.collect();
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Ok(rows)
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}
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@@ -3439,7 +3439,8 @@ mod tests {
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// T-1029 — Cross-family: no panics, correct materials, all deterministic
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// -----------------------------------------------------------------------
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/// All 7 T-1029 families must not panic on any sample position.
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/// All families (7 T-1029 landform + the T-1082 WaterBody zones) must not panic on
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/// any sample position, including extreme coordinates.
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#[test]
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fn all_families_no_panic_at_extreme_positions() {
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let zones = [
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@@ -3450,6 +3451,10 @@ mod tests {
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MorphologyZone::DuneStrand,
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MorphologyZone::MountainPass,
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MorphologyZone::MeanderReach,
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// T-1082 WaterBody zones.
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MorphologyZone::OpenOcean,
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MorphologyZone::Lake,
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MorphologyZone::TidalFlat,
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];
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let positions = [
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(0, 0),
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@@ -27,15 +27,15 @@
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},
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"morphology_zones": 9,
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"vegetation_classes": 3,
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"terrain_materials": 3
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"terrain_materials": 4
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},
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"coherence": {
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"water_districts": 46,
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||||
"water_districts": 49,
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||||
"water_districts_wet": 44,
|
||||
"drainage_samples": 10,
|
||||
"drainage_monotonic": 9,
|
||||
"drainage_samples": 0,
|
||||
"drainage_monotonic": 0,
|
||||
"vegetation_samples": 64,
|
||||
"vegetated_districts": 11
|
||||
"vegetated_districts": 8
|
||||
}
|
||||
},
|
||||
{
|
||||
@@ -69,10 +69,10 @@
|
||||
"terrain_materials": 4
|
||||
},
|
||||
"coherence": {
|
||||
"water_districts": 20,
|
||||
"water_districts_wet": 17,
|
||||
"drainage_samples": 6,
|
||||
"drainage_monotonic": 6,
|
||||
"water_districts": 25,
|
||||
"water_districts_wet": 22,
|
||||
"drainage_samples": 0,
|
||||
"drainage_monotonic": 0,
|
||||
"vegetation_samples": 64,
|
||||
"vegetated_districts": 0
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user