Placement used greedy farthest-first with a hard minimum spacing, so settlements
came out as a near-uniform lattice (unrealistic). Now placeSettlements() does
habitability-weighted random sampling (weight = habitability^civClusterExp) with
a soft Gaussian suppression (civMinSpacingRadians) around each pick, so towns
cluster on good land (rivers/coasts/fertile valleys) at irregular spacing and
leave empty stretches between. Nearest-neighbour distances now span ~0.04..0.39
rad (was ~uniform) and placement concentrates on the better cells.
- New knob civClusterExp (3.0; higher = tighter clustering on the best land);
civMinSpacingRadians repurposed as the soft suppression scale (0.10 -> 0.06).
- Separate sCivRng + deterministic, so determinism / RNG isolation hold.
- test_civ: replaced the hard-spacing assertion with clustering checks
(nearest-neighbour spacing varies; placed cells beat the habitable mean).
All 10 suites pass; GUI build clean. Docs updated.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Jonas Reith
868cc90667