sky
Position of the gradient center a azimuthal angle, p polar angle. The azimuthal angle indicates the position of the gradient center relative to 0 degree north, where degrees proceed clockwise. The polar angle indicates the height of the gradient center, where 0 degree is directly above, at zenith, and 90 degree at the horizon. Default value: 0,0. Minimum value: 0,0. Maximum value: 360,180.
This is an Expression representation of "sky-gradient-center".