# SkyAtmosphere

#### new Cesium.SkyAtmosphere(ellipsoid)
engine/Source/Scene/SkyAtmosphere.js 43

An atmosphere drawn around the limb of the provided ellipsoid. Based on Display of The Earth Taking Into Account Atmospheric Scattering.

This is only supported in 3D. Atmosphere is faded out when morphing to 2D or Columbus view.

Name | Type | Default | Description
--- | --- | --- | ---
`ellipsoid` | Ellipsoid | `Ellipsoid.WGS84` | optional The ellipsoid that the atmosphere is drawn around.

##### Example:

    scene.skyAtmosphere = new Cesium.SkyAtmosphere();

##### See:

- Scene.skyAtmosphere

### Members

#### atmosphereLightIntensity : number
engine/Source/Scene/SkyAtmosphere.js 89

The intensity of the light that is used for computing the sky atmosphere color.

Default Value: `50.0`

#### atmosphereMieAnisotropy : number
engine/Source/Scene/SkyAtmosphere.js 131

The anisotropy of the medium to consider for Mie scattering.

Valid values are between -1.0 and 1.0.

Default Value: `0.9`

#### atmosphereMieCoefficient : Cartesian3
engine/Source/Scene/SkyAtmosphere.js 105

The Mie scattering coefficient used in the atmospheric scattering equations for the sky atmosphere.

Default Value: `Cartesian3(21e-6, 21e-6, 21e-6)`

#### atmosphereMieScaleHeight : number
engine/Source/Scene/SkyAtmosphere.js 121

The Mie scale height used in the atmospheric scattering equations for the sky atmosphere, in meters.

Default Value: `3200.0`

#### atmosphereRayleighCoefficient : Cartesian3
engine/Source/Scene/SkyAtmosphere.js 97

The Rayleigh scattering coefficient used in the atmospheric scattering equations for the sky atmosphere.

Default Value: `Cartesian3(5.5e-6, 13.0e-6, 28.4e-6)`

#### atmosphereRayleighScaleHeight : number
engine/Source/Scene/SkyAtmosphere.js 113

The Rayleigh scale height used in the atmospheric scattering equations for the sky atmosphere, in meters.

Default Value: `10000.0`

#### brightnessShift : number
engine/Source/Scene/SkyAtmosphere.js 155

The brightness shift to apply to the atmosphere. Defaults to 0.0 (no shift). A brightness shift of -1.0 is complete darkness, which will let space show through.

Default Value: `0.0`

#### readonly ellipsoid : Ellipsoid
engine/Source/Scene/SkyAtmosphere.js 212

Gets the ellipsoid the atmosphere is drawn around.

#### hueShift : number
engine/Source/Scene/SkyAtmosphere.js 139

The hue shift to apply to the atmosphere. Defaults to 0.0 (no shift). A hue shift of 1.0 indicates a complete rotation of the hues available.

Default Value: `0.0`

#### perFragmentAtmosphere : boolean
engine/Source/Scene/SkyAtmosphere.js 61

Compute atmosphere per-fragment instead of per-vertex. This produces better looking atmosphere with a slight performance penalty.

Default Value: `false`

#### saturationShift : number
engine/Source/Scene/SkyAtmosphere.js 147

The saturation shift to apply to the atmosphere. Defaults to 0.0 (no shift). A saturation shift of -1.0 is monochrome.

Default Value: `0.0`

#### show : boolean
engine/Source/Scene/SkyAtmosphere.js 52

Determines if the atmosphere is shown.

Default Value: `true`

### Methods

#### destroy()
engine/Source/Scene/SkyAtmosphere.js 395

Destroys the WebGL resources held by this object. Destroying an object allows for deterministic release of WebGL resources, instead of relying on the garbage collector to destroy this object.
Once an object is destroyed, it should not be used; calling any function other than `isDestroyed` will result in a `DeveloperError` exception. Therefore, assign the return value (`undefined`) to the object as done in the example.

##### Throws:

- DeveloperError : This object was destroyed, i.e., destroy() was called.

##### Example:

    skyAtmosphere = skyAtmosphere && skyAtmosphere.destroy();

##### See:

- SkyAtmosphere#isDestroyed

#### isDestroyed() → boolean
engine/Source/Scene/SkyAtmosphere.js 375

Returns true if this object was destroyed; otherwise, false.
If this object was destroyed, it should not be used; calling any function other than `isDestroyed` will result in a `DeveloperError` exception.

##### Returns:

`true` if this object was destroyed; otherwise, `false`.

##### See:

- SkyAtmosphere#destroy

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