//  QUADRIC.H

//    Prototypes for QUADRIC.C

#ifndef _quadric_h

#define _quadric_h

typedef struct vec {// Vector structor

   double  x, y, z;// Coefficents of vector direction

}Vec;

typedef struct light {// Point light structure

   Vec    dir;// Direction to light

   double  Int;// Light intensity

}Light;

typedef struct mat {// Material structure

   double  r;// Red component

   double  b;// Blue component

   double  g;// Green component

   double  Ka;// Ambient reflection coefficent

   double  Kd;// Diffuse reflection coefficent

   double  Ks;// Specular reflection coefficent

   int  n;// Specular reflection exponent

  

}Mat;

typedef struct quad {// Quadric surface structure

   double  a, b, c, d, e;// Surface coefficents

   double  f, g, h, j, k;

   Mat     m;// Surface's material properties

}Quad;

typedef struct ray {// Ray structure

   Vec  org;// Origin of ray

   Vec  dir;// Direction of ray

   int  depth;// Depth (or length) of ray

}Ray;

double  dot( Vec, Vec );

double  intersect( Ray ray, Quad *obj );

Vec     mkvec( double, double, double );

void    normalize( Vec* );

Vec     svmpy( double, Vec );

Vec     vadd( Vec, Vec );

Vec     vsub( Vec, Vec );

#endif