符号付偶数交点数列 { 12,24,-18,-14,20,-8,2,-22,-4,-16,10,6 } 始点座標 { (2.5r,30,12,12K), (2.5r,30,10,10K) } 射影交点座標 { (2.5r,30,0,0), (2r,-90+15,0,0), (2r,-90-15,0,0), (r,30,0,0), (2.5r,150-2,0,0), (2r,30+15,0,0), (2r,31-10,0,0), (r,1…