符号付偶数交点数列 { 6, 8, 2, 4 } 始点座標 { (r,0,6r,0), (r,0,3r,0) } 射影交点座標 { (r,0,r,0), (r,180,-r,0), (r,-150,r,0), (r,30,-r,0) } 交点間中間点数列 { 1, 1, 1, 0, 1, 1, 1, 0 } 交点間中間点座標 { (0,0,r,0), (r,-90,-r,0), (r,90,-r,0), …