Hoshe found a CRITICAL coherence defect (Tyre APPROVE):
- CRITICAL: cluster_scatter received the per-voxel sub_chunk_seed as its cluster
seed, so voxels in the same 6m cell got different scatter -> salt-and-pepper,
not the §3-mandated clustered patches. Re-key on (world, body, cluster-cell):
add SeedDomain::Cover=10 (pinned); cluster_scatter(world_seed, body_id, x, y)
derives for_body(world_seed,body_id).derive(Cover, cluster_pair_id). derive_cover
now takes (world_seed, body_id, ...). (Hoshe #1)
- The coherence test was tautological (constant seed bypassed the broken path).
Rewritten to the production derive_cover signature in a cold-lake scatter band;
it FAILED at 20% on the old code, passes 100% now. (Hoshe #2)
- Zigzag-encode cluster (cx,cy) before Cantor pairing (negatives were cast as u64
directly); fix the misleading 'no collision' comment. (Hoshe #3, Tyre)
- Sea-ice band was inverted (~85% ice at the -2 onset). Now monotonic: ice grows
~8% (onset) -> ~92% (cold edge); leads (open gaps) layered only in the cold half
via a 3x super-cell, passing the super-cell index directly. Dead depth==0 guard
removed. (Hoshe #4, Tyre #1/#3)
cargo test passes, clippy -D warnings clean, fmt clean.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
88b4323585