This is a unit hemisphere and \xi_1 and \xi_2 are both sampled uniformly from [0, 1]. We construct a corresponding spherical coordinate using them by setting {r = 1, phi = arccos(xi_1), theta = arccos(2 * pi * \xi_2)}
This is a unit hemisphere and \xi_1 and \xi_2 are both sampled uniformly from [0, 1]. We construct a corresponding spherical coordinate using them by setting {r = 1, phi = arccos(xi_1), theta = arccos(2 * pi * \xi_2)}