A boolean comparison operator to be used within the visual shader graph. Returns the boolean result of the comparison between [code]INF[/code] or [code]NaN[/code] and a scalar parameter. The comparison function. See [enum Function] for options. Comparison with [code]INF[/code] (Infinity). Comparison with [code]NaN[/code] (Not a Number; denotes invalid numeric results, e.g. division by zero).