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>
