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>
2026-11-07 20:57:22 +00:00
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// Bakes Midnight Sky and Noonday Sky from src/sky/sun.js into src/sky/baked.ts, with the
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// atmospheric-scattering tables (src/sky/scatter.js) as `scatter`.
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// Run `npm run bake:sky` after changing sun.js, skyTokens.js, scatter.js or a moment.
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2026-11-06 20:57:31 +00:00
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import { writeFileSync } from 'node:fs';
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import { bakeSky } from '../src/sky/skyTokens.js';
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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>
2026-11-07 20:57:22 +00:00
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import { bakeScatter } from '../src/sky/scatter.js';
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2026-11-06 20:57:31 +00:00
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const out = new URL('../src/sky/baked.ts', import.meta.url);
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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>
2026-11-07 20:57:22 +00:00
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const baked = {
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midnight: bakeSky('midnight'),
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noonday: bakeSky('noonday'),
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scatter: bakeScatter(),
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};
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2026-11-06 20:57:31 +00:00
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writeFileSync(
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out,
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`// Generated by scripts/bake-sky.mjs from src/sky/sun.js. Do not edit.\n` +
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`/* eslint-disable */\n` +
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`export const baked = ${JSON.stringify(baked, null, 2)} as const;\n`
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);
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