how much sky the haze covers, 0 (clear) to 1 (pea soup)
Optional
the layer's own wind in cells per second, added to the breeze; default { x: 0, y: 0 }
{ x: 0, y: 0 }
which sky; validated finite
seconds of drift; validated finite
how much sky the haze covers, 0 (clear) to 1 (pea soup)