Dogcows Code - chaz/rasterize/blob - contact.hh

   1
   2 /*
   3  * CS5600 University of Utah
   4  * Charles McGarvey
   5  * mcgarvey@eng.utah.edu
   6  */
   7
   8 #ifndef _CONTACT_HH_
   9 #define _CONTACT_HH_
  10
  11 #include "vec.hh"
  12
  13
  14 /*
  15  * A class for a collision contact.
  16  */
  17 struct contact
  18 {
  19     vec_t   p;  // point of collision
  20     vec_t   n;  // normal of surface at collision point
  21     scal_t  d;  // distance along the ray
  22 };
  23 typedef struct contact contact_t;
  24
  25 /*
  26  * Initialize a contact with a point of contact, normal of surface at
  27  * contact point, and distance along ray.
  28  */
  29 INLINE_MAYBE
  30 void contact_init(contact_t* c, vec_t point, vec_t normal, scal_t distance)
  31 {
  32     c->p = point;
  33     c->n = normal;
  34     c->d = distance;
  35 }
  36
  37
  38 /*
  39  * Create a new contact with a point of contact, normal of surface at
  40  * contact point, and distance along ray.
  41  */
  42 INLINE_MAYBE
  43 contact_t contact_new(vec_t point, vec_t normal, scal_t distance)
  44 {
  45     contact_t c;
  46     contact_init(&c, point, normal, distance);
  47     return c;
  48 }
  49
  50
  51 #endif // _CONTACT_HH_
  52