/*************************************************************************									** CLASS: Primitive							** AUTHOR: Jean-Francois DOUE						** LAST MODIFICATION: 12 Oct 1993					**									** This class is an abstract class which defines the basic methods	** to which every ray-traceable object (primitive) will have to respond. ** It also stores the color and the phong coefficients of the primitive	**									*************************************************************************/#ifndef Primitive_h#define Primitive_h 1#include "Object3D.h"class Primitive: public Object3D{protected: vec3	col;	    // color of the primitive vec4	ph;	    // phong coefficients of the objectpublic: vec3 color() { return col; }; double phong(int i) { return ph[i]; }; double closest_intersection(double *x, int x_num); // virtual methods virtual ~Primitive(); virtual double intersect(vec3& ray_org, vec3& ray_dir) = 0; virtual vec3 normalAt(vec3& p) = 0; // friends friend istream& operator >> (istream& s, Primitive& a);};#endif