OptionalcellsOptionalcellscanvas pixels down; default 36
Optionaldensityhow much sky the haze covers, 0 to 1; default 0.5
Optionaldriftthe sheet's own wind in cells per second, added to the breeze; default a slow sideways breathe
sheet size in world units
Optionalintentwhat the drift is for under reduced motion; default decorative, which holds the sky still
Optionalopacitysheet opacity; default 1
Optionalseedwhich sky; default 1
Optionaltinthaze colour as a hex number; default white
sheet size in world units
canvas pixels across; default 64 (a small canvas scaled up keeps edges soft and cheap)