Camera was moving in (1, 0.7) but looking mostly in +Z — 55
deg between them meant tiles collected along motion weren't in
the user's forward view. Now:
- ro = (0, 2.2, drift) \u2014 motion purely in +Z
- GROUND_TRAVEL_COS/SIN = (0, 1) \u2014 corridor runs along +Z
- rd = mostly forward +Z, with downward tilt for the ground view
Everything (motion, look, tile collection) is now on the same
+Z axis. Tiles appear directly in front of the camera as it
moves forward, no more 45-55 deg offset.
Richard Zink
587c8f4a19