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Comparing ray/src/rt/ambcomp.c (file contents):
Revision 2.3 by greg, Wed Mar 4 16:28:25 1992 UTC vs.
Revision 2.5 by greg, Wed May 3 09:46:31 1995 UTC

# Line 27 | Line 27 | typedef struct {
27          short  nt, np;          /* number of theta and phi directions */
28   }  AMBHEMI;             /* ambient sample hemisphere */
29  
30 – extern double  sin(), cos(), sqrt();
30  
32 –
31   static int
32   ambcmp(d1, d2)                          /* decreasing order */
33   AMBSAMP  *d1, *d2;
# Line 148 | Line 146 | FVECT  pg, dg;
146                                  arad += dp->r;
147                          }
148                  }
149 <        if (ns > 0) {                   /* perform super-sampling */
149 >        if (ns > 0 && arad > FTINY && ndivs/arad < minarad)
150 >                ns = 0;                 /* close enough */
151 >        else if (ns > 0) {              /* else perform super-sampling */
152                  comperrs(div, &hemi);                   /* compute errors */
153                  qsort(div, ndivs, sizeof(AMBSAMP), ambcmp);     /* sort divs */
154                                                  /* super-sample */

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