axialTilt was visual-only ("groundwork for seasons"). It now drives climate.
computeClimate() adds derived sTempSummer/sTempWinter around the annual mean:
summer/winter = sTemp +/- A, A = seasonAmpMax * sin(tilt)/sin(23.44) *
latShape * continentality
- tiltFactor: 0 tilt -> no seasons, Earth tilt -> 1.
- latShape (pow(|lat|/90, seasonLatExp)): poles swing most.
- continentality: a multi-source BFS ring-distance from ocean cells -- oceans
and coasts are muted by thermal inertia, interiors swing most.
Result: ~0 swing at the equatorial coast, large at high-latitude interiors.
classifyBiomes() blends WINTER temp into the Tundra/Taiga cold cutoffs via
biomeSeasonWeight (0 = annual-mean only = unchanged biomes; default 0.6), so
cold-winter continental interiors become boreal/tundra (Siberia effect). The
amplitude is geographically shaped, so cold biomes expand only where seasons
bite. Fields are derived/not-saved -> no save-format change.
Viewer: color key 6 now CYCLES Temperature -> summer -> winter -> seasonality
(new seasonColor ramp + labels); cell-info shows summer/winter. New season* +
biomeSeasonWeight config knobs (planet.cfg, validated). Docs updated.
Headless (test/season): summer >= mean >= winter; equator swing ~1.6 C vs
~20 C at high latitude; interior land >> ocean; tilt=0 -> no seasons; higher
tilt -> bigger swing; biomeSeasonWeight=0 leaves biomes unchanged; cold-biome
count rises with seasons; deterministic. test_logic + test_biota pass; full
app builds clean.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
World-Creation stage after biomes. Two layers (raylib-free engine):
- Per-cell density scalars (flora/fauna/funga in [0,1]) derived from the
climate fields each tick (drive color modes 8/9/0). Flora = Liebig-min of
temp & moisture; fauna ~ flora with carnivores gated on local prey; funga =
moisture/organic-matter-led + cold-tolerant. Zero on water/ice.
- On-demand discrete population (key L, saved as v7): each land cell draws
broad archetypes from a comprehensive table into a per-kind slot cap +
density-scaled point budget (size -> cost), weighted by biome/climate
suitability and a regional bonus for same-biome neighbours. Separate RNG
seeded from cfg.seed so generating biota never perturbs tectonic determinism.
Organisms are labelled by taxonomy (Family + Size + role, e.g. "Felidae
(Big, Carnivore)") with the full Class > Order > Family tree stored, never an
informal common name. Cell-info panel word-wraps + aggregates duplicates so the
lists no longer get cut off.
New: src/sim/PlanetBiota.{hpp,cpp} + PlanetFlora/Fauna/FungiGen.cpp, color
modes/colors, bio* config knobs, save v7 (older saves load with empty
population), test_biota.cpp (densities, fauna<=capacity, carnivore gating,
slot/point budgets, determinism + RNG isolation, v7 round-trip). Docs updated.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
C++/raylib semi-realistic fantasy/sci-fi planet generator on a fixed icosphere
grid (Eulerian: properties flow over fixed cells). World-creation stages:
tectonics, continental drift & erosion, hydrology (rivers/lakes), climate
(temperature + orographic precipitation), and biome classification. Engine in
src/sim (raylib-free, headless-testable), viewer in src/render. See CLAUDE.md
and docs/ (design-notes.md, fauna-flora-plan.md = next step).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
