Usage
generate_cloud_layer(
heightmap,
sun_altitude = 90,
sun_angle = 315,
levels = 8,
offset_x = 0,
offset_y = 0,
time = 0,
start_altitude = 1000,
end_altitude = 2500,
alpha_coef = 0.8,
scale_x = 1,
scale_y = 1,
scale_z = 1,
freq = 0.01/2,
coef = 0.05,
seed = 1
)