sky: Midnight Sky and Noonday Sky baked from sun.js; bubbles and buttons as albedo x irradiance (do not merge) #22
2026-11-07
sky: bake an atmospheric-scattering table (half float) for a WebGL2 sky shader
scatter.js ray-marches a single-scattering Rayleigh+Mie atmosphere whose vertical optical depth is
sun.js's TAU, and bakes two tables into baked.scatter: transmittance to space by view elevation
(32x1) and sky radiance by azimuth from the sun x view elevation x sun elevation (7x32x12), RGB
half floats, little-endian base64, value x 64. Layout, exact decode and a GLSL sampler are in
src/sky/README.md. Tests pin layout, encoding, checksums and physical anchors (zenith transmittance
equals exp(-TAU); blue noon, red low sun toward the sun, black below the planet-shadow limit).
The per-sky sun {elevation_deg, azimuth_deg, color_linear}, ambient_linear and horizon_hex were
already baked in 7216456a; sun.js now exports TAU.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
sky: bake sun azimuth and colour, ambient with a night floor, horizon colour
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
2026-11-06
sky: Midnight Sky and Noonday Sky baked from sun.js (albedo x irradiance)
Two themes replace the navy GameCult theme. Every colour is a bark, leaf, soil or pigment albedo times the irradiance sun.js gives for a fixed moment (equinox noon and midnight, 45N). scripts/bake-sky.mjs writes src/sky/baked.ts: the terrain-free sky gradient used as the fallback background, folds tokens for panels and buttons, chat bubble colours, link and name colours. skyTokens.test.ts holds every text pairing to WCAG AA and fails if baked.ts is stale. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>