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Comparing ray/src/rt/ambcomp.c (file contents):
Revision 1.12 by greg, Tue Aug 20 13:32:51 1991 UTC vs.
Revision 1.14 by greg, Mon Aug 26 10:11:39 1991 UTC

# Line 72 | Line 72 | RAY  *r;
72          hlist[0] = r->rno;
73          hlist[1] = dp->t;
74          hlist[2] = dp->p;
75 <        peano(spt, 2, urand(ilhash(hlist,3)+dp->n), .01);
75 >        multisamp(spt, 2, urand(ilhash(hlist,3)+dp->n));
76          zd = sqrt((dp->t + spt[0])/h->nt);
77          phi = 2.0*PI * (dp->p + spt[1])/h->np;
78          xd = cos(phi) * zd;
# Line 237 | Line 237 | double  wt;
237   {
238          register int  i;
239                                          /* set number of divisions */
240 +        if (wt < (.25*PI)/ambdiv+FTINY) {
241 +                hp->nt = hp->np = 0;
242 +                return;                 /* zero samples */
243 +        }
244          hp->nt = sqrt(ambdiv * wt / PI) + 0.5;
245 <        hp->np = PI * hp->nt;
245 >        hp->np = PI * hp->nt + 0.5;
246                                          /* make axes */
247          VCOPY(hp->uz, r->ron);
248          hp->uy[0] = hp->uy[1] = hp->uy[2] = 0.0;

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