149 	virtual Vector3 normal(Vector3 &P) = 0;

   149 	virtual Vector3 normal(Vector3 &P) = 0;

   150 

   150 

   151 	virtual BBox get_bbox() = 0;

   151 	virtual BBox get_bbox() = 0;

   152 };

   152 };

   153 

   153 

   154 class Sphere: public Shape

   158 class Sphere: public Shape

   155 {

   159 {

   156 	Float sqr_radius;

   160 	Float sqr_radius;

   157 	Float inv_radius;

   161 	Float inv_radius;

   158 public:

   162 public: