符号付偶数交点数列 { -12,10,-16,-2,14,-6,8,-4 } 始点座標 { (0,0,-r,-8r), (0,0,-r,-5r) } 射影交点座標 { (0,0,-r,-3r/2), (0,0,1.1r,0.8r), (0,0,2.4r,-r), (0,0,0,0), (0,0,r,2r), (0,0,r,-1.2r), (0,0,-r,1.3r), (0,0,2r,r) } 交点間中間点数列 { 0, …