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An example of the CDF for the HG phase function. Drawn random number ξ and the sampled cos θξ are given in red. (a) The forward lookup table (cos θj values and their corresponding CDFj values) is presented with blue circles. The values of cos θj in the forward lookup table are evenly spaced. (b) The inverted lookup table (cos θj values and their corresponding CDFj values) is presented with red circles. The CDFj values in the inverted lookup table are evenly spaced.
