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magicciv/.project/objectives/p3-20-weather-affects-scouting.md
Natalie e77149f8fb feat(@projects/@magic-civilization): 🌫️ p3-20 DONE — weather reduces scouting in the rendered game 
Completes weather→scouting. weather.gd gains vision_penalty_at(col,row) (worst
penalty from active events covering the tile, hex-distance footprint);
world_map_vision.recalculate_vision cuts each unit's sight radius by it (floored
at 1) before computing visible_hexes — so a unit standing in a storm/blizzard/dust
storm reveals fewer tiles. The penalty VALUE is Rust-derived (WeatherEvent.vision_penalty,
data); GDScript only reads + applies it. Headless path has compute_vision_with_penalties.

Verified: mc-climate 45/0, mc-vision 30/0, GUT vision_penalty_at (within/outside/
worst-overlap); dylib rebuilt + deployed; canonical GUT 747/0.

p3-20 → done. Next: p3-21 (weather-driven migration).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-25 16:45:04 -04:00

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id title priority status scope owner updated_at evidence
p3-20 Weather affects scouting — vision/LoS penalty under storms, blizzards, dust p3 done game1 warcouncil 2026-06-25
mc-climate WeatherEvent.vision_penalty + derive_events per-kind (storm 1, blizzard/dust_storm 2); tests
mc-vision compute_vision_with_penalties (floored at WEATHER_MIN_VISION); test
GDScript: weather.vision_penalty_at + world_map_vision radius reduction; GUT vision_penalty_at tests
dylib rebuilt + deployed; canonical GUT 747/0

Summary

The runtime weather system (mc-climate::weather, six Game-1 types: Storm, Heat Wave, Blizzard, Drought, Flood, Dust Storm) derives events per turn and applies a movement_penalty to units, with real unit HP damage wired into the played turn (climate_effects.gd:125). But WeatherEvent carries no vision/line-of-sight effect — weather slows movement and hurts units, but does not reduce scouting range. So storms/blizzards/dust have no effect on exploration, fog reveal, or surprise — a missed gameplay lever for the weather system.

Progress (2026-06-25)

Weather-producer side done: WeatherEvent.vision_penalty: i32 added (mc-climate); derive_events sets it per kind (storm 1, blizzard 2, dust_storm 2; heat_wave/drought/flood 0). Tests assert the per-kind values (mc-climate 45/0). Vision-consumer side DONE: compute_vision_with_penalties (mc-vision) shrinks a unit's effective sight by the per-tile penalty (floored at WEATHER_MIN_VISION=1); compute_vision delegates with an empty map so existing callers are unchanged. Test weather_vision_penalty_shrinks_unit_sight (mc-vision 30/0). Remaining: the bridge/GDScript wiring — build the per-tile penalty map from live weather events + call compute_vision_with_penalties in the playable vision path + dylib/GUT. (Per-kind values inline for now; data-drive to WeatherThresholds/climate_spec.json is a follow-up.)

Acceptance

  • WeatherEvent.vision_penalty added (mc-climate); derive_events sets it per kind (storm 1, blizzard/dust_storm 2; others 0). (Inline per-kind; thresholds/json data-drive is a noted follow-up.)
  • Vision reduces sight under weather: rendered fog (world_map_vision.recalculate_vision cuts a unit's radius by weather.vision_penalty_at(tile), floored at 1); headless via mc-vision::compute_vision_with_penalties.
  • Rendered fog wired + GUT-verified; headless capability ready (compute_vision_with_penalties). The penalty VALUE is Rust-derived (data); GDScript consumes it. (Headless weather is GDScript-orchestrated, so weather→vision is primarily a rendered-game concern; the headless caller wiring is contingent on headless weather.)
  • Surfaced: the rendered TileMap fog reveals fewer tiles under weather.
  • Tests: mc-climate per-kind vision_penalty (45/0), mc-vision weather_vision_penalty_shrinks_unit_sight (30/0), GUT vision_penalty_at within/outside/ worst-overlap; dylib rebuilt + canonical GUT 747/0.

Code sites

  • mc-climate/src/weather.rs (WeatherEvent + thresholds)
  • the vision computation (mc-vision / PlayerVision; pathfinder.gd::visible_hexes
    • the Rust vision projection)
  • public/resources/.../weather*.json (per-type vision_penalty authoring)

Notes

Verified 2026-06-25 — weather is movement_penalty-only; no vision field exists.