MVA Global Fret 8033c0fd02 Self-host rotating Earth video, project red Paris-Tana line in 3D ...

Replace the Pexels stock clip with a higher-quality Earth-from-space loop
hosted in /videos (720p, 60s, slowed 2x, 12 MB). The static SVG arc is
gone — the route is now computed every frame from a 3D projection that
follows the globe's rotation:

- France (48.85N, 2.35E) and Antananarivo (-18.9N, 47.5E) are placed on
  a unit sphere, then rotated around the Y axis to match the apparent
  central longitude of the video at each frame (LON0=140 deg, omega
  =-5.75 deg/s, calibrated empirically from sample frames).
- A great-circle arc is sampled with slerp and projected
  orthographically; only the front-side portion (z > 0) is drawn.
- Pins fade out when their city rotates behind the globe; the whole
  group fades out when both endpoints are on the back side.

Mouse parallax dropped — it would desync the SVG from the video and
break alignment.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-05-04 23:41:23 +02:00

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