符号付偶数交点数列 { 8,-14,-20,12,24,-2,6,26,-22,-4,-28,-16,10,18 } 始点座標 { (r,180,-(L+8)r,-r), (r,180,-(L+6)r,-r) } 射影交点座標 { (0,0,-Lr,-r), (0,0,0,-r),(0,0,2r,-3r), (0,0,-2r,-3r), (0,0,-2r,3r), (0,0,-2r,-r), (0,0,0,-3r), (0,0,0,r)…