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root/radiance/ray/src/rt/glass.c
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Comparing ray/src/rt/glass.c (file contents):
Revision 2.1 by greg, Tue Nov 12 17:09:32 1991 UTC vs.
Revision 2.3 by greg, Fri Oct 2 16:17:31 1992 UTC

# Line 46 | Line 46 | m_glass(m, r)          /* color a ray which hit a thin glass s
46   OBJREC  *m;
47   register RAY  *r;
48   {
49 –        double  sqrt(), pow();
49          COLOR  mcolor;
50          double  pdot;
51          FVECT  pnorm;
# Line 95 | Line 94 | register RAY  *r;
94                  if (!(r->crtype & SHADOW) &&
95                                  DOT(r->pert,r->pert) > FTINY*FTINY) {
96                          for (i = 0; i < 3; i++)         /* perturb direction */
97 <                                p.rdir[i] = r->rdir[i] - r->pert[i]/rindex;
97 >                                p.rdir[i] = r->rdir[i] +
98 >                                                2.*(1.-rindex)*r->pert[i];
99                          normalize(p.rdir);
100                  } else {
101                          VCOPY(p.rdir, r->rdir);

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