Jonas Reith
cc6813e211
The live clock capped at 1 month/second (liveRate <= 720 sim-hours/s), far too slow to watch civilizations, wars and empires evolve over centuries. Raise the ceiling to ~20 sim-years/second (a century in ~5 s). - liveRateMax() helper (20 x dayLengthHours x yearLengthDays); the [ / ] ramp and the load-resume clamp both use it (was the hardcoded 720 in two places). - HUD rate label gains a "yr/s" tier above "mo/s". - The per-year sim tick (wars + territory) now catches up one year at a time over any years a frame skips (bounded to 12/frame), so at high speed wars/borders are still simulated for every year instead of teleporting; a backward step still just refreshes territory without re-running wars. Render/input-only: no engine, save-format or config change. Build clean, 13/13 tests pass. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
379 lines
24 KiB
Markdown
379 lines
24 KiB
Markdown
# Planet Sim - World Creation
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Fixed icosphere geometry; properties (elevation, plate, age, climate, biome) flow
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over it. World creation runs as continuous, overlapping stages on a geological clock:
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tectonics (boundary stress forms mountains/trenches) → continental drift & erosion →
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hydrology (rivers/lakes) → climate (temperature/precipitation) → biomes → biota
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(flora/fauna/funga). Initial
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terrain forming is a generator (a couple hundred paced ticks, ~3 s, auto-pauses at
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equilibrium), then drift/erosion/etc. continue. Press R to reseed, SPACE to pause.
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(The eventual goal is a separate slow real-time "Live World" weather/life mode.)
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## Build (Nobara / Linux)
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Dependencies (raylib build needs these dev headers):
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sudo dnf install cmake gcc-c++ mesa-libGL-devel libX11-devel \
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libXrandr-devel libXinerama-devel libXcursor-devel libXi-devel \
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wayland-devel libxkbcommon-devel
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Then:
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cmake -B build -DCMAKE_BUILD_TYPE=Release
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cmake --build build -j
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./build/planetsim
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raylib 5.5 is fetched automatically via CMake FetchContent.
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OpenMP parallelizes the tectonic step (auto-detected by CMake; ships with
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gcc, no extra package needed). It's optional -- without it the sim still runs,
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serial. The step is memory-bandwidth-bound, so `OMP_NUM_THREADS=4` to `8` gives
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the full ~2.8x speedup; the default uses all cores for no extra gain:
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OMP_NUM_THREADS=6 ./build/planetsim
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## Controls
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LMB drag orbit camera (in the 3D view)
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wheel zoom
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hover show cell info (works in the 3D globe and the 2D map)
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click open tile detail panel (subtiles grid, hoverable) + overlay
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C close the detail panel
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1 .. 7 color by elevation / plate / age / crust type / biome / temperature / precipitation
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8 / 9 / 0 color by biota density: flora / fauna / funga
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B toggle plate borders (on by default)
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D toggle per-plate drift arrows + P<id> labels (on by default)
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G toggle lat/lon graticule (+ degree numbers on the 2D map edges)
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J toggle rivers (Phase 2.5 hydrology)
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H start/stop Phase 2.5 (hydrology: rivers, lakes, fluvial erosion)
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L generate biota population (flora/fauna/funga; settled world; re-press regenerates)
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W enter / leave Live World (slow real-time clock; settled world)
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N toggle the day/night terminator (Live World)
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T toggle the tide-coloured coastline (Live World)
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O toggle ocean-current arrows (warm = poleward/red, cold = equatorward/blue)
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K toggle weather clouds/rain cover (Live World)
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V toggle volcano markers (Live World; cones + eruption glow, build into islands)
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M toggle place-name labels (names continents/oceans/ranges/rivers/lakes; Atlas tab)
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E ecoregions colour view (names ecological provinces on first use; Eco tab)
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I habitability heat map (where civilization can thrive)
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U settlements: the dawn of civilization on first press, then toggle markers (Civ tab)
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P territory / realms view + political borders + war fronts (Realms tab lists nations & wars)
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X culture / faiths view + cultural borders (peoples/ethos/religion in the Cultures tab)
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Y follow-cam: cycle the 3D camera through active storms (Live World; off after last)
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. / , step the live clock forward / back by one rate-unit (auto-pauses; back also
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rewinds weather + storms via an undo history)
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wheel over the 2D map: zoom toward cursor (1-8x); drag pans when zoomed
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SPACE pause while forming / re-evolve once settled (or the on-screen button)
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[ / ] drift speed (My/s) -- in Live World: live clock rate (hours/s -> up to ~20 years/s)
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S single tectonic tick (in Live World: step the clock forward, like '.')
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F fast-forward Phase-1 forming to settled (instant)
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R reseed planet (restart forming)
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+ / - subdivision level (detail), 1..7
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F5 / F9 save / load full state (planet.save)
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F12 screenshot to screenshot.png
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F2 reload planet.cfg (validated) and regenerate
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CLI flags (applied before the first load/generate):
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--seed N override the config seed
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--config PATH use an alternate config file instead of planet.cfg
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## Files (written in the working directory)
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planet.cfg human-editable key=value config of every PlanetConfig parameter;
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auto-created on first run, reload live with F2. Range-checked on
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load; an invalid file reverts to safe defaults (not overwritten).
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planet.save binary snapshot (versioned, currently v17: +geography/atlas; v16
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+event log; v15 +stateful
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volcanoes; v13 +Live World clock rate; v12 +step-back history
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(~40 frames, so a load can rewind storms); v11 +weather systems/storms;
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v10 +weather fields; v9 +moons; v8 +Live World clock; v7 +biota): seed + config + full planet state; F5
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writes it, F9 reloads and resumes deterministically. As of v6
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the config is stored as a self-describing key=value block (like
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planet.cfg), so adding/removing config fields no longer breaks saves
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(unknown keys ignored, missing keys default). v6 cannot load pre-v6
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saves (one-time break) -- regenerate them.
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## Config (planet.cfg, or PlanetConfig defaults in code)
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radius 6.371e6 m (Earth) -- free to change
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subdivisions 5 (~10k cells, ~223 km/cell)
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plateCount 12
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seaLevel 0 m
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axialTilt 23.44 deg obliquity: leans the 3D globe + spin axis (visual; seasons later)
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Tectonic tuning (also PlanetConfig): relief builds gradually toward an
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isostatic equilibrium instead of saturating to the clamp.
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continentBase 300 m resting elevation of continental crust
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oceanBase -6000 m deep abyssal floor (oldest oceanic crust)
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upliftGain 1.3e5 m/tick per unit convergence stress
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beltWidth 3 cell-rings a mountain belt spreads inland
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relax 0.02 isostatic relaxation toward base, per tick
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Orogeny + seafloor (PlanetConfig): tall, persistent mountains and age-based
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ocean depth. The orogeny boosts (collision/arc/persistence) are drift-only --
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Phase 1 forms as before; tall mountains grow during Phase-2 drift.
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collisionFactor 1.8 continent-continent uplift (Himalaya); raise = taller
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arcFactor 1.4 continental subduction-arc uplift (Andes)
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isostaticPersist 0.85 how strongly high crust resists relax (0..<1)
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rootScale 2500 m above continentBase where persistence saturates
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peakSoftCapStart 7000 m below this a tick's uplift always takes (P=1)
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peakSoftCapEnd 12000 m at/above this uplift never takes (P=0); also the elev clamp
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peakFailDrop 200 m max random drop when the grow roll loses (drift-only)
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ridgeDepth -2500 m shallow elevation of brand-new crust at a ridge
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seafloorSubsidence 280 m per sqrt(My): seafloor deepens with crustal age
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seafloorSeedAge 80 My initial oceanic age spread at generation
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Hydrology (PlanetConfig, Phase 2.5): macro drainage network + fluvial erosion.
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Drift keeps running at a finer timestep during hydrology. (Config keys keep the
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`phase3*` names for save/cfg compatibility; the UI labels this "Phase 2.5".)
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phase3AfterMy 300 My drift before the "Start Phase 2.5?" prompt
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phase3DtScale 0.2 hydrology timestep = cflDtMy()*this (finer = slower drift)
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rainfall 1.0 uniform precip per cell (drainage-area unit)
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riverThreshold 25 discharge above which a cell is a river (lower = richer network)
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riverIncision 0.02 K in stream-power incision K*Q^m*S^n*dt (raise = carve faster)
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riverDischargeExp 0.5 m (discharge exponent)
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riverSlopeExp 1.0 n (slope exponent)
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riverTransport 0.1 transport capacity coefficient (cap = this*Q*S)
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depFrac 0.25 fraction of excess sediment deposited per cell
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Biomes (PlanetConfig, Phase 3): per-cell biome classification thresholds. Temperature
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= biomeEquatorTemp - biomePoleDrop*(|lat|/90)^biomeLatExp - biomeElevLapse*elevAbove.
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biomeEquatorTemp 30 C temperature at the equator, sea level
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biomePoleDrop 58 C equator->pole temperature drop
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biomeLatExp 1.3 >1 keeps mid-latitudes temperate (cold concentrates at poles)
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biomeElevLapse 0.006 C lost per metre above sea level
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biomeIceTemp -9.5 C below -> Ice (polar caps + snowcaps); raise = bigger caps
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biomeTundraTemp 2 C below (and above ice) -> Tundra/Taiga
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biomeTaigaTemp 10 C cool + wet -> boreal forest
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biomeSavannaTemp 22 C warm + moderate moisture -> savanna
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biomeMountainElev 3000 m above sea level -> Mountains
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biomeHillsElev 1200 m above sea level -> Hills
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biomeBeachBand 60 m above sea level + adjacent ocean -> Beach
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biomeLowlandElev 500 m wetlands only below this elevation
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biomeWetlandMoist 0.72 moisture above this (low lowland) -> Wetland
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biomeDesertMoist 0.28 moisture below this -> Desert
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biomeGrassMoist 0.50 moisture below this -> Grassland/Savanna, else Forest
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biomeTaigaMoist 0.40 cool + above this -> Taiga (else Tundra)
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biomeLakeMinDepth 20 m filled-basin depth above sea level counting as a Lake
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biomeSeasonWeight 0.6 winter temp weight in the Tundra/Taiga cutoffs (0 = annual mean only)
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Seasons (PlanetConfig): axialTilt (above) drives per-cell summer/winter temps; color key 6
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cycles temperature -> summer -> winter -> seasonality.
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seasonAmpMax 18 C max seasonal half-range at full tilt/latitude/interior
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seasonLatExp 1.2 latitude shape exponent (>1 pushes swing toward the poles)
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seasonOceanFactor 0.15 ocean/coast seasonal-swing floor (thermal inertia)
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seasonContinentRings 6 ocean-distance rings to reach full continentality (1 ~ 223 km)
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Climate (PlanetConfig, Phase 3): temperature uses the biome* temp params above;
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precipitation advects ocean moisture along zonal winds (windward rain, leeward rain
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shadow, dry interiors) then diffuses it. Color modes 6 (temperature) / 7 (precipitation).
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climateOceanMoisture 1.0 moisture air carries leaving the ocean (source)
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climateRainEfficiency 0.5 fraction of available moisture*belt that rains per cell
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climateOrographic 3.0 extra rain per unit normalized upslope (windward)
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climateOroRefHeight 500 m upslope that counts as one orographic unit
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climateContinentality 0.05 fractional moisture lost per inland cell (dries interiors)
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climateWindPasses 50 moisture-advection iterations (steady state)
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climateMoistureSmooth 12 precipitation diffusion passes (raise = smoother, more grass/forest)
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climateCurrentFactor 4 C max coastal warming/cooling from ocean currents (0 = off; O shows arrows)
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Biota (PlanetConfig): flora/fauna/funga. Density scalars drive color modes 8/9/0;
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the discrete slot/point population is generated on demand (L) and saved (v7).
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bioVegTempMin -5 C below this no plant growth
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bioVegTempOpt 15 C at/above this temperature isn't limiting (flora)
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bioVegMoistRef 0.5 normalized moisture where water isn't limiting (flora)
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bioFaunaProductivity 0.9 herbivore carrying capacity per unit vegetation
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bioCarnPreyMin 0.30 min local prey (fauna density) to support carnivores
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bioCarnScale 1.0 carnivore weight ramp above the prey threshold
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bioFungaMoistRef 0.4 normalized moisture where fungi aren't water-limited
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bioFungaFloraWeight 0.6 how much fungi lean on flora (organic matter), 0..1
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bioFungaTempMin -15 C above this fungi are not cold-limited (cold-tolerant)
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bioRegionBonus 0.5 weight boost for archetypes present in same-biome neighbours
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bioFloraSlots 12 max distinct flora per cell (point budget caps abundance)
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bioFaunaSlots 10 max distinct fauna per cell
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bioFungaSlots 8 max distinct funga per cell
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bioFloraPoints 20 flora point budget at full density (scaled by density)
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bioFaunaPoints 16 fauna point budget at full density
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bioFungaPoints 14 funga point budget at full density
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Live World (PlanetConfig): the slow real-time clock (hours -> weeks/months) over the
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finished planet -- a moving day/night terminator, a live seasonal temperature cycle and a
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moving snow line. axialTilt (above) drives the seasonal declination. Press W to enter.
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dayLengthHours 24 hours in one planetary day (rotation -> day/night)
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yearLengthDays 365.25 days in one planetary year (orbit -> seasons)
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snowTemp 0 C land below the live temperature shows snow
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seaIceTemp -2 C ocean below the live temperature shows sea ice
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tideAmplitude 0.6 m equilibrium-tide scale per unit tide-raising weight
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tideSunFactor 0.46 sun's tide weight relative to a unit moon (Earth ~0.46)
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Moons (1-3, randomized in generateMoons() + saved v9): orbit on the live clock, raise the
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tides with the sun, and render as small lit spheres with phases, orbit rings and eclipses.
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Weather (PlanetConfig, Live World): a dynamic clouds/rain cycle on the live clock (key K),
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saved v10. Evaporate over warm seas -> advect along the wind -> condense -> rain -> dissipate.
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weatherEvapRate 0.4 /h ocean evaporation toward marine saturation
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weatherWindKmh 45 km/h wind speed advecting humidity/cloud
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weatherSatBase 0.4 air saturation at 0 C (lower = cloudier)
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weatherSatTempCoef 0.025 saturation rise per +1 C
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weatherCondense 0.6 /h supersaturation -> cloud
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weatherOrographic 0.0009 extra condensation per m of windward upslope
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weatherRainThresh 0.5 cloud cover above this rains
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weatherRainRate 0.5 /h rain rate from excess cloud
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weatherCloudDissip 0.12 /h cloud clearing
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weatherSystemMax 8 max concurrent moving weather systems
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weatherSpawnRate 0.06 /h genesis probability scale
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weatherSystemSpeed 28 km/h drift speed of systems
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weatherTropicalSST 26 C min sea-surface temp for tropical genesis
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weatherSystemRadius 0.16 rad angular radius of a system's cloud/rain shield
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weatherSystemCloud 1.2 /h cloud stamped at a system core
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weatherSystemRain 1.6 /h rain at a system core
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weatherHurricaneStr 0.6 strength above which a tropical system is a hurricane/typhoon
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Live info tabs (Live World): the panel beside the 2D map has Sky, Tides, Weather and Events.
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Events are a saved, capped journal (newest 200) for storm genesis/intensification, volcano
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dormancy, eruptions and volcanic-island breaches; clicking an event selects and centres its cell.
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Volcanoes (PlanetConfig, Live World, key V): placed by tectonic context on entering Live World,
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then integrated as stateful lifecycle agents: grow, go dormant, explode, puff ash, and regrow
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weaker. Step-back snapshots include volcano state. Saved v15+.
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volcanoProbRidge 0.55 per-cell placement prob on a young spreading-ridge cell
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volcanoProbBorder 0.06 per-cell placement prob on a normal plate-border cell
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volcanoProbInterior 0.003 per-cell placement prob elsewhere (hotspots)
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volcanoMaxCount 60 global cap (reservoir-sampled, ratios preserved)
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volcanoBuildRate 0.02 m/h of growth at activity=1 while growing
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volcanoFreeHeight 1000 m absolute height below which vents cannot go dormant
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volcanoInitialBuildMax 2500 m max pre-built height when Live World starts
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volcanoMaxHeight 3200 m built height where dormancy becomes certain
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volcanoDormancyRate 1.0 per-year dormancy hazard scale above free height
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volcanoDormantMinYears 120 minimum dormancy before explosion
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volcanoDormantMaxYears 1200 maximum dormancy before explosion
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volcanoExplodeDropFrac 0.20 fraction of built height shaved by explosion
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volcanoActivityDecay 0.70 activity multiplier after each explosion
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volcanoDeadActivity 0.05 growth stops at/below this activity
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volcanoBlastRadius 0.09 radian radius of the instant explosion ash blast
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volcanoBlastCloud 1.5 cloud cover added inside the blast
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volcanoAshMinYears 0.5 minimum sustained ash emission after explosion
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volcanoAshMaxYears 3.0 maximum sustained ash emission after explosion
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volcanoAshPuffCellsPerWeek 2.0 average local cells puffed per week
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volcanoAshCloud 0.9 cloud cover injected by sustained ash
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volcanoAshCooling 6 C peak local cooling under an active ash plume
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Geography / atlas (PlanetConfig, key M): extract + name geographic features from the frozen
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terrain (continents, islands, oceans, seas, lakes, mountain ranges, peaks, rivers). Generated
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once on a settled world, saved v17. The foundation of the civilization arc.
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geoContinentMinCells 40 land component >= this many cells = Continent (else Island)
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geoSeaMaxCells 60 ocean basin <= this many cells = Sea (else Ocean)
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geoOceanSepRadians 1.4 min angular gap between ocean-basin centres (higher = fewer oceans)
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geoOceanDeep 4 min rings from land for a cell to seed an ocean basin
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geoMountainElev 2500 m min elevation for a mountain-range cell
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geoRangeMinCells 4 min cells for a named mountain range
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geoRiverMinDischarge 80 min mouth discharge for a named river
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geoMaxRivers 40 cap on named rivers (largest by discharge)
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geoMaxPeaks 40 cap on named peaks (highest)
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Civilization (PlanetConfig, key U): settlements placed once on the best fertile cells, then their
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population grows/declines on the Live World clock toward a food-driven carrying capacity. Saved v20.
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civMaxSettlements 80 cap on settlement sites
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civMinSpacingRadians 0.06 soft suppression scale around each pick (lower = tighter clusters)
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civClusterExp 3.0 habitability weighting for placement (higher = clusters on the best land)
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civMinHabitability 0.22 don't place a settlement below this habitability
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civSeedPopulation 250 initial village population
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civGrowthRate 0.02 logistic growth rate per year
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civMaxPopulation 2e6 carrying capacity at habitability 1
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civTownPop 5000 population at/above which a settlement is a Town
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civCityPop 100000 population at/above which a settlement is a City
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civAbandonPop 50 below this = abandoned/ruins (can revive)
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civHabWaterWeight 0.45 habitability weight of water access (rivers/lakes/coast)
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civHabFoodWeight 0.40 habitability weight of food (flora/fauna + ecoregion productivity)
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civHabTempOpt 18 C most comfortable annual-mean temperature
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civHabElevPenalty 2500 m high terrain steeply penalised above this
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civSiteVariety 1.0 0 = flat city sizes; higher = big rivers/coasts host far larger cities
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civGrowthMin 0.25 growth-rate floor at habitability 0 (rate scales with habitability)
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civHarvestVar 0.25 year-to-year harvest swing (scaled by continentality)
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civDroughtStrength 0.70 how hard a full drought cuts a region's carrying capacity
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civDroughtPeriod 8 yr drought-noise epoch length (drought duration scale)
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civDroughtThresh -0.15 drought-onset threshold (lower = rarer)
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civDroughtArid 0.50 extra drought-proneness in arid regions
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civColdYearStrength 0.50 crop loss in a rare cold year, x the cell's cold exposure
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civFloodBonus 0.25 fertile-silt bonus on river cells (rare flood disaster)
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civFamineRate 0.15 /yr accelerated population loss when food < population
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civStormDeathRate 0.50 /yr deaths from a full-strength storm over a settlement
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civHurricaneDeathMult 3.0 extra storm-death multiplier for a hurricane/typhoon
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Territory & nations (PlanetConfig, key P — derived from settlements, not saved): each settlement
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projects a size-scaled influence range; nearby smaller towns become vassals of a larger capital
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(a kingdom/empire), the rest are city-states; land cells inside a settlement's reach are its
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territory, leaving wilderness frontiers between realms.
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civTerritoryBase 0.035 rad base influence radius of any settlement
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civTerritoryScale 0.05 rad extra reach per log10 of population (big cities reach far)
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civTerritoryMax 0.35 rad cap on a single settlement's reach
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civVassalRange 1.5 x a capital's range = how far it annexes towns into its realm
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civEmpireMinMembers 5 settlements in a realm to count as an empire
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civEmpirePop 5e6 total realm population to count as an empire
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Conflict & war (PlanetConfig, save v21 — stateful; shows on the Territory view P + Events/Realms tabs):
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neighbouring realms grow hostile and fight; casualties shrink frontier cities; the winner conquers a
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city (its allegiance flips) or sacks it (ruins); conquered foreign/distant cities revolt, so empires
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rise and fall. Runs on the yearly Live-World tick.
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warMaxConcurrent 6 cap on simultaneous active wars
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warDeclareRate 0.12 war-declaration chance scale (x hostility)
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warAmbition 1.0 hostility weight of the size gap (strong preys on weak)
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warIdeology 0.8 hostility weight of culture + faith difference
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warBorder 0.5 hostility weight of contested frontier
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warWarlikeMult 1.4 military-strength bonus for a Warlike-ethos realm
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warCasualtyRate 0.06 per war-year frontier-city population loss (loser more)
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warConquerScore 0.6 |warscore| past which the winner takes a city
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warSackChance 0.3 chance a taken city is razed to ruins instead of flipped
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warExhaustion 1.5 |warscore| past which a war ends in peace (also a 60-yr cap)
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warRevoltRate 0.04 per-year base revolt chance of a held foreign/distant city
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warMinRealmPop 2000 realms below this population don't start wars
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Culture, beliefs & governments (key X — derived from settlements + geography, not saved): settlements
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on a continent share a culture (a people with an environment-driven ethos + a religion); each realm
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gets a government type folded into its name (Republic of X / Duchy of X / X Theocracy / ...); realms
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stay mono-cultural. No config knobs — the ethos/faith/government rules are constants in
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src/sim/PlanetCulture.cpp (computeCultures).
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## Headless logic test (no display)
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g++ -std=c++17 -O2 -Isrc/sim test_logic.cpp src/sim/IcoSphere.cpp \
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src/sim/Planet.cpp src/sim/PlanetTectonics.cpp src/sim/PlanetDrift.cpp \
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src/sim/PlanetErosion.cpp src/sim/PlanetHydrology.cpp \
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src/sim/PlanetBiomes.cpp src/sim/PlanetClimate.cpp src/sim/PlanetLive.cpp \
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src/sim/PlanetOcean.cpp src/sim/PlanetWeather.cpp src/sim/PlanetVolcano.cpp \
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src/sim/PlanetBiota.cpp \
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src/sim/PlanetFloraGen.cpp src/sim/PlanetFaunaGen.cpp src/sim/PlanetFungiGen.cpp \
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src/sim/NameGen.cpp src/sim/PlanetGeography.cpp src/sim/PlanetEcoregions.cpp \
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src/sim/PlanetCiv.cpp src/sim/PlanetNation.cpp src/sim/PlanetCulture.cpp src/sim/PlanetConflict.cpp \
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src/sim/PlanetIO.cpp -o /tmp/t && /tmp/t
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# Same source list for every suite: swap test_logic.cpp -> test_biota / test_live / test_ocean /
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# test_weather / test_volcano / test_geography / test_ecoregions / test_civ / test_nation / test_culture / test_conflict.
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|
# The CMake build also includes test_events for the viewer event journal.
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|
|
|
Verifies geometry, plate assignment, gradual non-saturating relief and
|
|
determinism. Run after changing Planet::step().
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|
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## Notes for later phases
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- Cell has a `subgrid` shared_ptr hook (null in phase 1) for the future
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|
fine-resolution per-cell mesh (phases 4/5: civilization/culture).
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|
- `neighbors` adjacency already built -> reuse for diffusion, climate,
|
|
cross-cell-boundary interaction.
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|
- elevation is continuous meters (double); climate in phase 3 can read it
|
|
as a smooth function, not coarse bands.
|