scene: rebuild only for a different drawn sky; URL-steered night sky within the Night backdrop (+ link readability numbers) #55
2026-11-10
sky: Midnight Sky's link is fitted to clear AA on the lightest Night sky
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The dark theme's link was #609385 (luminance 0.2505), 2.28:1 on the lightest Night sky (0.081642). It is now brightened in its own hue until its luminance is at least AA * (0.081642 + 0.05) - 0.05 = 0.5424: #8ad1bd (0.5468, hue 163 degrees as before), 4.53:1 on the lightest Night sky, 5.43:1 on the darkest, 11.28:1 on the sign-in card (was 5.68). Only the link changes in baked.ts; the user colours are unchanged. NIGHT_SKY_LIGHTEST is the Night backdrop constant, and a test fails if the two drift. Dusk is untouched. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
scene: a rebuild is for a different drawn sky; a URL-steered night sky stays within the Night backdrop
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Rebuild key: the sky options the scene is built from (terrainSkyFor / ridgeSkyFor), not the pair of choice and resolved state, so picking Day while the clock says day, or Auto to the state it resolves to, no longer tears down and rebuilds the scene. A URL steers only 'auto', so there the options differ and it still rebuilds. Night: the band ceiling 0.085 let a sky the page URL steers (?sun=, ?sky=) show up to 0.0890, lighter than the Night constant 0.081705 the text was checked against. The ceiling is now 0.077394, the luma at which one 8-bit step up reads the baked night's own lightest, and the constant (0.081642) covers the steered case; a test pins it. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>