Camera moves at uTime * uSpeed * 0.45 in +X with +X*0.7 in +Z.
Previous axis-aligned corridor (long in X, perp in Z) was
perpendicular to the actual travel direction, wasting tiles in
the +Z / -X corner where the camera never goes.
Now the corridor is rotated 35 deg to match travel:
- GROUND_TRAVEL_COS/SIN = 0.82/0.57 (cos/sin of 35 deg)
- GROUND_CORRIDOR_LONG = 15 (tiles along travel)
- GROUND_CORRIDOR_PERP = 5 (tiles perpendicular)
- rebuildGroundMosaic iterates (lng, perp) in rotated frame,
draws each tile at canvas position (lng, perp) but loads from
tile (dx, dz) rotated from (lng, perp) by travel angle
- Shader rotates hitPoint into corridor frame, then divides by
per-axis extent to get UV
Richard Zink
930fd2b2f1