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Comparing ray/src/rt/raytrace.c (file contents):
Revision 1.19 by greg, Fri Jun 14 10:34:26 1991 UTC vs.
Revision 1.23 by greg, Wed Oct 23 13:43:45 1991 UTC

# Line 23 | Line 23 | extern int  maxdepth;                  /* maximum recursion depth */
23   extern double  minweight;               /* minimum ray weight */
24   extern int  do_irrad;                   /* compute irradiance? */
25  
26 < long  nrays = 0L;                       /* number of rays traced */
26 > long  raynum = 0L;                      /* next unique ray number */
27 > long  nrays = 0L;                       /* number of calls to localhit */
28  
29 < static double  Lambfa[5] = {PI, PI, PI, 0.0, 0.0};
29 > static FLOAT  Lambfa[5] = {PI, PI, PI, 0.0, 0.0};
30   OBJREC  Lamb = {
31          OVOID, MAT_PLASTIC, "Lambertian",
32          {0, 5, NULL, Lambfa}, NULL, -1,
# Line 47 | Line 48 | double  rw;
48                  r->crtype = r->rtype = rt;
49                  r->rsrc = -1;
50                  r->clipset = NULL;
51 +                r->revf = raytrace;
52          } else {                                /* spawned ray */
53                  r->rlvl = ro->rlvl;
54                  if (rt & RAYREFL) {
# Line 57 | Line 59 | double  rw;
59                          r->rsrc = ro->rsrc;
60                          r->clipset = ro->newcset;
61                  }
62 +                r->revf = ro->revf;
63                  r->rweight = ro->rweight * rw;
64                  r->crtype = ro->crtype | (r->rtype = rt);
65                  VCOPY(r->rorg, ro->rop);
66          }
67 <        r->rno = nrays;
67 >        rayclear(r);
68 >        return(r->rlvl <= maxdepth && r->rweight >= minweight ? 0 : -1);
69 > }
70 >
71 >
72 > rayclear(r)                     /* clear a ray for (re)evaluation */
73 > register RAY  *r;
74 > {
75 >        r->rno = raynum++;
76          r->newcset = r->clipset;
77          r->ro = NULL;
78          r->rot = FHUGE;
# Line 69 | Line 80 | double  rw;
80          setcolor(r->pcol, 1.0, 1.0, 1.0);
81          setcolor(r->rcol, 0.0, 0.0, 0.0);
82          r->rt = 0.0;
72 –        return(r->rlvl <= maxdepth && r->rweight >= minweight ? 0 : -1);
83   }
84  
85  
86 < rayvalue(r)                     /* compute a ray's value */
86 > raytrace(r)                     /* trace a ray and compute its value */
87   RAY  *r;
88   {
89          extern int  (*trace)();
# Line 314 | Line 324 | register CUBE  *scene;
324          register int  i;
325  
326          nrays++;                        /* increment trace counter */
317 –
327          sflags = 0;
328          for (i = 0; i < 3; i++) {
329                  curpos[i] = r->rorg[i];

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