Optional center: [number, number, number]The center of the atmosphere. Defaults to upDirection * -{@link Atmosphere.bottomRadius} (upDirection depends on yUp).
If true, the up direction for the default center will be [0, 1, 0], otherwise [0, 0, 1] will be used.
If this is true, Mie.phaseParam will be set to a value suitable for the Cornette-Shanks approximation (0.8), otherwise it is set to 3.4 for use with the Henyey-Greenstein + Draine approximation.
Atmosphere parameters corresponding to earth's atmosphere.
Create a default atmosphere that corresponds to earth's atmosphere.