jpmschweitzerandClaude Opus 4.8
b6be9f5758
Replace the sun-driven Stefan-Boltzmann temperature with the D-240 class-envelope model. Temperature derives only from authored fields — no orbit/star physics. - [planet_class_temperature] envelope table in climate_constants.toml (approved bands: frozen [-90,-25] .. hot_arid [20,58] .. volcanic [30,90]); cold_/hot_/ warm_ prefix parsing; temperate fallback for unknowns. - derive_temperature_c(params, constants, body_seed): band = envelope(planet_class); latitude lerps across it (equator=warm, pole=cold); atmosphere greenhouse + elevation lapse modulate within; small seed nudge for per-body variety; CLAMP to band — a body can never escape its class. Airless -> None. - Delete the dead astrophysics: derive_distance_au, ClimateConstants::luminosity(), the [star_luminosity] table. Strip orbital_period_days/spectral_class/star_type/ axial_tilt_deg from BodyParams + BodyParamsReader (read 3 cols from bodies, no star_systems join). DB columns left in place (no regen). - New every_planet_class_derives_within_its_band test (13 classes x 5 atmo x 19 lat x 4 seeds, all in band) — the D-240 consistency guard. Verified on 25 diverse real bodies: the worlds that derived to +356C now sit inside their class bands (temperate capped at 28C). cargo test passes, clippy -D warnings clean, fmt clean. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
68 lines
3.1 KiB
TOML
68 lines
3.1 KiB
TOML
# Climate constants for district temperature derivation (T-1024, D-239 §2, D-240).
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#
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# Source-canonical — loaded by the Rust simulation at runtime.
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# Changing these constants does NOT require a DB migration (runtime file, not DB).
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# To tune: edit here, rerun the server, inspect Atlas temperature maps.
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#
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# Three tables are required:
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# [planet_class_temperature] — per-class [cold_end, warm_end] °C band (D-240).
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# [greenhouse_offset_c] — mean-annual base temperature offset by atmosphere class.
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# [diurnal_amplitude_c] — day/night swing AMPLITUDE by atmosphere class.
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#
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# Temperature derivation formula (D-240):
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# (cold, warm) = planet_class_temperature[planet_class] # envelope
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# t_lat = warm - (warm - cold) * (|latitude_deg| / 90) # latitude lerp
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# greenhouse modulates within the band
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# elevation lapse pulls toward cold end
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# seed nudge ±~3°C
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# CLAMP to [cold, warm] — body can never derive outside its class band.
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#
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# No atmosphere → temperature_c = None (airless body; D-227).
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# ---------------------------------------------------------------------------
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# Planet class temperature envelopes (D-240).
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# Each entry: [cold_end_c, warm_end_c] — the band a body of this class stays in.
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# Prefix rules: "cold_*" shifts both ends ~10°C colder; "hot_*" ~10°C warmer;
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# "warm_*" ~5°C warmer. Unknown class falls back to "temperate" band.
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# ---------------------------------------------------------------------------
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[planet_class_temperature]
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frozen = [-90.0, -25.0]
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ice = [-90.0, -25.0]
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boreal = [-35.0, 12.0]
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cold_arid = [-40.0, 20.0]
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temperate = [-12.0, 28.0]
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oceanic = [-12.0, 28.0]
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subtropical = [ 2.0, 34.0]
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warm_ocean = [ 2.0, 34.0]
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tropical = [ 16.0, 40.0]
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arid = [ -5.0, 45.0]
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hot_arid = [ 20.0, 58.0]
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volcanic = [ 30.0, 90.0]
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geothermal = [ 30.0, 90.0]
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[greenhouse_offset_c]
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# Greenhouse warming contribution per atmosphere class — used as a fractional
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# nudge toward the warm end of the class band, not an absolute Kelvin offset.
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# "none" is not present — airless bodies skip the climate branch entirely (D-227).
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# Values represent a 0.0–1.0 fraction of the band width to add toward warm end.
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# thin=0.1 (slightly warmer), breathable/standard=0.25, toxic=0.25, dense=0.55
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thin = 0.10
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standard = 0.25
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toxic = 0.25
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breathable = 0.25
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dense = 0.55
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[diurnal_amplitude_c]
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# Day/night swing amplitude (°C). The actual swing is ±amplitude around the
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# mean temperature; the morning minimum is T_mean - amplitude, noon maximum is
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# T_mean + amplitude. Thick/dense atmosphere = small swing (heat redistribution);
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# thin/no atmosphere = large swing.
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#
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# "none" is excluded — airless bodies have no climate temperature (D-227).
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# Values are plausible physics; tune without recompile by editing this file.
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thin = 50 # ~50°C day/night swing: large, like Mars
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standard = 15 # ~15°C: Earth-like moderate swing
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toxic = 20 # intermediate: thick but maybe less redistribution
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breathable = 15 # synonym for standard
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dense = 3 # ~3°C: Venus-like near-uniform temperature
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