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feat: lock lowground routing; smooth river courses with the road pass's RDP+Chaikin (terrain-water task 23)

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LOWGROUND is the gate verdict and the locked default ('short' stays available
behind the dial for the record). Every river polyline (upland stem + lowland
reach) is now decimated with RDP(4.0) and rounded with 4 Chaikin passes —
numerically mirroring MapGenerator.SmoothPath, since this pass is Godot-free —
before the bed profile is built, so the carved centreline carries none of the
8-connected Dijkstra 45° kinks (task-22 §4 caveat a). The monotone-descent and
sea-clamp constraints are applied to the smoothed course, unchanged.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Stewart Howe 2026-08-11 19:37:29 -04:00
parent 1eacd22972
commit 148602b4c5
2 changed files with 54 additions and 2 deletions
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4
Core/Scripts/ConfigManager.cs
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@ -113,7 +113,9 @@ namespace IslaApocalypse.Core // Change this if your namespace is different
// terrain-aware), "lowground" follows the lowest ground and wanders like a
// real river — the task-22 gate decides which ships; "lowground" is the
// provisional default pending that verdict. Width/depth scales are taste
// dials on the flow-proportional bed profile. RiverSeaMargin is the bed's
// dials on the flow-proportional bed profile. LOWGROUND is the LOCKED
// default — the task-22/23 gate verdict ("short" stays available for the
// record). RiverSeaMargin is the bed's
// absolute floor above sea — the erosion flood-guard discipline: no river
// bed may create inland below-sea cells, so the rendered coastline cannot
// move even with rivers carved.