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import CesiumMath from "../Core/Math.js";
import DynamicAtmosphereLightingType from "./DynamicAtmosphereLightingType.js";
/**
* Common atmosphere settings used by 3D Tiles and models for rendering sky atmosphere, ground atmosphere, and fog.
*
* <p>
* This class is not to be confused with {@link SkyAtmosphere}, which is responsible for rendering the sky.
* </p>
* <p>
* While the atmosphere settings affect the color of fog, see {@link Fog} to control how fog is rendered.
* </p>
*
* @alias Atmosphere
* @constructor
*
* @example
* // Turn on dynamic atmosphere lighting using the sun direction
* scene.atmosphere.dynamicLighting = Cesium.DynamicAtmosphereLightingType.SUNLIGHT;
*
* @example
* // Turn on dynamic lighting using whatever light source is in the scene
* scene.light = new Cesium.DirectionalLight({
* direction: new Cesium.Cartesian3(1, 0, 0)
* });
* scene.atmosphere.dynamicLighting = Cesium.DynamicAtmosphereLightingType.SCENE_LIGHT;
*
* @example
* // Adjust the color of the atmosphere effects.
* scene.atmosphere.hueShift = 0.4; // Cycle 40% around the color wheel
* scene.atmosphere.brightnessShift = 0.25; // Increase the brightness
* scene.atmosphere.saturationShift = -0.1; // Desaturate the colors
*
* @see SkyAtmosphere
* @see Globe
* @see Fog
*/
function Atmosphere() {
/**
* The intensity of the light that is used for computing the ground atmosphere color.
*
* @type {number}
* @default 10.0
*/
this.lightIntensity = 10.0;
/**
* The Rayleigh scattering coefficient used in the atmospheric scattering equations for the ground atmosphere.
*
* @type {Cartesian3}
* @default Cartesian3(5.5e-6, 13.0e-6, 28.4e-6)
*/
this.rayleighCoefficient = new Cartesian3(5.5e-6, 13.0e-6, 28.4e-6);
/**
* The Mie scattering coefficient used in the atmospheric scattering equations for the ground atmosphere.
*
* @type {Cartesian3}
* @default Cartesian3(21e-6, 21e-6, 21e-6)
*/
this.mieCoefficient = new Cartesian3(21e-6, 21e-6, 21e-6);
/**
* The Rayleigh scale height used in the atmospheric scattering equations for the ground atmosphere, in meters.
*
* @type {number}
* @default 10000.0
*/
this.rayleighScaleHeight = 10000.0;
/**
* The Mie scale height used in the atmospheric scattering equations for the ground atmosphere, in meters.
*
* @type {number}
* @default 3200.0
*/
this.mieScaleHeight = 3200.0;
/**
* The anisotropy of the medium to consider for Mie scattering.
* <p>
* Valid values are between -1.0 and 1.0.
* </p>
*
* @type {number}
* @default 0.9
*/
this.mieAnisotropy = 0.9;
/**
* 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.
*
* @type {number}
* @default 0.0
*/
this.hueShift = 0.0;
/**
* The saturation shift to apply to the atmosphere. Defaults to 0.0 (no shift).
* A saturation shift of -1.0 is monochrome.
*
* @type {number}
* @default 0.0
*/
this.saturationShift = 0.0;
/**
* 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.
*
* @type {number}
* @default 0.0
*/
this.brightnessShift = 0.0;
/**
* When not DynamicAtmosphereLightingType.NONE, the selected light source will
* be used for dynamically lighting all atmosphere-related rendering effects.
*
* @type {DynamicAtmosphereLightingType}
* @default DynamicAtmosphereLightingType.NONE
*/
this.dynamicLighting = DynamicAtmosphereLightingType.NONE;
}
/**
* Returns <code>true</code> if the atmosphere shader requires a color correct step.
* @param {Atmosphere} atmosphere The atmosphere instance to check
* @returns {boolean} true if the atmosphere shader requires a color correct step
*/
Atmosphere.requiresColorCorrect = function (atmosphere) {
return !(
CesiumMath.equalsEpsilon(atmosphere.hueShift, 0.0, CesiumMath.EPSILON7) &&
CesiumMath.equalsEpsilon(
atmosphere.saturationShift,
0.0,
CesiumMath.EPSILON7,
) &&
CesiumMath.equalsEpsilon(
atmosphere.brightnessShift,
0.0,
CesiumMath.EPSILON7,
)
);
};
export default Atmosphere;
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