Reference

Sky parameters

SkyParams is the whole sky as one JSON-safe object. Presets are partial SkyParams, setParams merges into them, and getParams prints the complete set.

sky.params;                        // the targets (what presets and setParams write)
sky.current;                       // the eased values actually being rendered
sky.setParams({ haze: 0.3 });      // partial, eased
sky.setParams({ haze: 0.3 }, { immediate: true });
sky.getParams();                   // complete copy, numbers rounded to 3 decimals, no `view`

#Clouds

Key	Range	Default
`cloudForm`	`cumulus`, `altocumulus`, `towering`, `cirrus`, `noctilucent`, `cumulonimbus`	`cumulus`	See cloud forms
`humidity`	0 – 1	`0.5`	Cover and cirrus amount
`coverage`	−1 – 1	`0`	Extra coverage on top of humidity
`precipitation`	0 – 1	`0`	Dark bases, rain veils, gloom; lightning above 0.4
`temperature`	0 – 1	`0.45`	Base altitude and vertical growth
`density`	0 – 1	`0.55`	Extinction
`edge`	0 – 1	`0.58`	Erosion strength, for crisper edges
`clump`	0 – 1	`0.5`	Weather map: km-scale clumps and clearings
`cirrus`	0 – 2	`1`	Cirrus multiplier
`wind`	0 – 1	`0.35`	Drift speed
`windDirection`	degrees	`293`	World azimuth the clouds drift toward
`lightning`	0 – 1	`1`	0 disables lightning

#Atmosphere and light

Key	Range	Default
`haze`	0 – 1	`0.14`	Extra aerosol: milkier sky, redder sunsets, hazier distance
`exposure`	EV	`0`	Offset on the auto exposure
`sunSize`	×	`1`	Sun disc size
`moonSize`	×	`1`	Moon disc size
`stars`	×	`1`	Star brightness
`groundColor`	linear RGB	`[0.09, 0.1, 0.08]`	Albedo of the ground model below the horizon

#Time and place

Key	Range	Default
`timeOfDay`	0 – 24	`15.95`	Hours
`northOffset`	degrees	`112.58`	World azimuth of north: rotates sun, moon and stars
`latitude`	degrees	`34`
`declination`	−23.4 – 23.4	`11`	Solar declination (season)
`lunarAge`	0 – 29.53	`18.3`	Days since new moon

#Post pass

Only read when a post pass is rendering.

Key	Range	Default
`fogDensity`	×	`1`	Fog multiplier (0 disables)
`godRays`	0 – 2	`0.6`	Volumetric shaft strength
`bloom`	0 – 1	`0.3`	Bloom
`shafts`	0 – 1	`0.3`	Radial sun shafts

#Demo only

Key
`view`	`{ yaw?, pitch?, faceMoon? }`	A framing hint used by the demo; the library ignores it