92 	virtual bool intersect_all(const Ray &ray, float dist, vector<float> &allts) = 0;

    92 	virtual bool intersect_all(const Ray &ray, float dist, vector<float> &allts) = 0;

    93 

    93 

    94 	// normal at point P

    94 	// normal at point P

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

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

    96 

    96 

    98 };

    98 };

    99 

    99 

   100 class Sphere: public Shape

   100 class Sphere: public Shape

   101 {

   101 {

   102 	float sqr_radius;

   102 	float sqr_radius;

   109 		sqr_radius(aradius*aradius), inv_radius(1.0f/aradius),

   109 		sqr_radius(aradius*aradius), inv_radius(1.0f/aradius),

   110 		center(acenter), radius(aradius) { material = amaterial; }

   110 		center(acenter), radius(aradius) { material = amaterial; }

   111 	bool intersect(const Ray &ray, float &dist);

   111 	bool intersect(const Ray &ray, float &dist);

   112 	bool intersect_all(const Ray &ray, float dist, vector<float> &allts);

   112 	bool intersect_all(const Ray &ray, float dist, vector<float> &allts);

   113 	Vector3 normal(Vector3 &P) { return (P - center) * inv_radius; };

   113 	Vector3 normal(Vector3 &P) { return (P - center) * inv_radius; };

   114 };

   115 };

   115 

   116 

   116 class Plane: public Shape

   117 class Plane: public Shape

   117 {

   118 {

   118 public:

   119 public:

   124 	Plane(const Vector3 &normal, const Vector3 &point):

   125 	Plane(const Vector3 &normal, const Vector3 &point):

   125 		N(normal), d(0) { /*TODO*/};

   126 		N(normal), d(0) { /*TODO*/};

   126 	bool intersect(const Ray &ray, float &dist);

   127 	bool intersect(const Ray &ray, float &dist);

   127 	bool intersect_all(const Ray &ray, float dist, vector<float> &allts) {return false;};

   128 	bool intersect_all(const Ray &ray, float dist, vector<float> &allts) {return false;};

   128 	Vector3 normal(Vector3 &) { return N; };

   129 	Vector3 normal(Vector3 &) { return N; };

   129 };

   131 };

   130 

   132 

   131 class Triangle: public Shape

   133 class Triangle: public Shape

   132 {

   134 {

   133 	int k; // dominant axis

   135 	int k; // dominant axis