重载一个函数，以便它可以将基类转换为派生类作为参数

I am attempting to model a 3D world, which has objects of spheres and capsules inside of it. I modeled it in a way that the shape class is the base class and that the sphere and capsule classes inherit from the base class (which, if I implemented it correctly, is a perfectly virtual class). I am attempting to model a 3D world, which has