Hi there, no need apologizing for asking a question :-) The output is indeed not right. One should expect the following: fan > $p = new PolyhedralFan(INPUT_RAYS => [[1,0],[1,3]], INPUT_CONES=>[[0,1]]); fan > print $p->F_VECTOR; 2 1 fan > print $p->CONES; <{0} {1} > <{0,1} > Since the apex is the onl...