Materials changes version 2 - Iceland and California
1. Keep regional definitions for the new default airport BIKF, and Iceland. Uses
new grass colours texture airport-grass-summer3.png with custom autumn effect i
n alpha channel, and bare volcanic bare ground layer - to produce patchy grass a
nd blend in with surrounding landclasses. 3d grass overlays have height modulati
on turned on so grass patches are followed. Actual grass cover and colour at BIK
F varies a lot even for the same month in different years going by photos, needs
autumn effect to depict the range properly. The grass near the terminal areas s
eems to receive a more water while the rest is often quite bare in photos - the
current patchy-ness is a compromise. The texture for low settings is still autum
n-grass-summer2.png.
2. Keep regional definitions for KSFO and California. Switches to grass effect s
o 3d grass is enabled. Grass layer and patchy bare ground layer format with heig
ht modulation for 3d grass. Currently tuned to hints of dry green grass similar
to the old version.
