Previous look direction had rd.y from -0.05 to -0.40 across
the screen, so most rays hit ground at tGround in [9, 44] — way
beyond the 16-unit mosaic. Those OOB pixels came back as solid
edge colour, creating the striped band of texture-then-edge
transitions.
New look: rd.y from -1.10 (bottom) to 0.20 (top). At uv.y=0
rd.y=-0.45 (26° below horizon) so the visible ground sits at
tGround < 6 — all within the 16-unit mosaic. Ground mask
threshold also tightened from -0.30 to -0.10 so the ground
fades to sky higher in the image (looks like atmospheric haze).
Fog distance 14 → matches the new closer-ground regime.
Richard Zink
9c17682aed