toJSON( /* meta */ ) {

		return {
			type: 'FogExp2',
			name: this.name,
			color: this.color.getHex(),
			density: this.density
		};

	}
Serializes the fog into JSON.

@param {?(Object|string)} meta - An optional value holding meta information about the serialization.
@return {Object} A JSON object representing the serialized fog