Kelsi 158ab192f0 feat(editor): river tool now fills water along the carved path ...

The river path tool used to carve the channel and texture the banks
but never added a water layer — users had to manually run
"Fill Water" afterward, which floods the entire tile. The fix is a
new TerrainEditor::fillWaterAlongPath() method that adds water
layers only to chunks the river segment passes through (within
width + chunk-half-diagonal of the line).

Per-chunk water height is set to the chunk's post-carve minimum
terrain height + 0.5y offset so the water sits visibly in the
channel without overflowing onto banks.

The river apply path now invokes carveRiver → paintAlongPath →
fillWaterAlongPath in sequence. Toast updated to mention all three.

Multi-point rivers are still next on the list — the underlying
math takes a single segment today, so a polyline river needs a UI
revamp to capture N points + a per-segment loop. Ack'd, not done
this commit.

2026-05-07 10:17:36 -07:00

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