Hark Pro's background isn't generated — it's a real-time physics-based sky simulation on device

jakubzeg · x · 2026-10-15

The Hark Pro team explains how its background works — not a video or generated image, but a live on-device simulation of your actual sky.

• Sun and moon positions are computed from your location, so sunrise/sunset match yours; live weather layers add cloud cover, directional wind, humidity, haze, air quality, and city glow from NASA satellite data
• Colors come from a physical model of atmospheric light scattering; optical phenomena (halos, sundogs, coronas, purple afterglow, clouds reigniting pink) from Lynch & Livingston's Color and Light in Nature appear only when real conditions call for them
• The team first tried generated moody images from user data as prompts but found them inconsistent — the final pass grades the render with a color LUT and polarizing-filter effect

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