A.
Stop players from passing through walls in development(游戏开发中防止角色穿过墙壁)
B.
Construct 3D models with boolean operation of polyhedrons (利用简单几何体进行布尔运算创建复杂三维模型)
C.
Get the number of intersections of segments on the plane (判断平面上线段的交点个数)
D.
Ray tracing method for photorealistic rendering (光线追踪算法进行真实感渲染)