Hi, The cone you defined is in fact a linear subspace, hence there are no rays but there is a non-empty lineality section: polytope > print $p->LINEALITY_SPACE; 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 1/2 -1/2 1 1/2 -1/2 1 0 0 0...