/*
 * CS5600 University of Utah
 * Charles McGarvey
 * mcgarvey@eng.utah.edu
 */

#ifndef _CONTACT_HH_
#define _CONTACT_HH_

#include "vec.hh"


/*
 * A class for a collision contact.
 */
struct contact
{
    vec_t   p;  // point of collision
    vec_t   n;  // normal of surface at collision point
    scal_t  d;  // distance along the ray
};
typedef struct contact contact_t;

/*
 * Initialize a contact with a point of contact, normal of surface at
 * contact point, and distance along ray.
 */
INLINE_MAYBE
void contact_init(contact_t* c, vec_t point, vec_t normal, scal_t distance)
{
    c->p = point;
    c->n = normal;
    c->d = distance;
}


/*
 * Create a new contact with a point of contact, normal of surface at
 * contact point, and distance along ray.
 */
INLINE_MAYBE
contact_t contact_new(vec_t point, vec_t normal, scal_t distance)
{
    contact_t c;
    contact_init(&c, point, normal, distance);
    return c;
}


#endif // _CONTACT_HH_