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root/radiance/ray/src/rt/normal.c
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Comparing ray/src/rt/normal.c (file contents):
Revision 2.22 by greg, Fri Oct 16 10:20:29 1992 UTC vs.
Revision 2.23 by greg, Fri Feb 12 10:41:02 1993 UTC

# Line 102 | Line 102 | double  omega;                 /* light source size */
102                                                  /* + source if flat */
103                  if (np->specfl & SP_FLAT)
104                          dtmp += omega/(4.0*PI);
105 <                                                /* delta */
105 >                                                /* half vector */
106                  vtmp[0] = ldir[0] - np->rp->rdir[0];
107                  vtmp[1] = ldir[1] - np->rp->rdir[1];
108                  vtmp[2] = ldir[2] - np->rp->rdir[2];
109                  d2 = DOT(vtmp, np->pnorm);
110 <                d2 = 2.0 - 2.0*d2/sqrt(DOT(vtmp,vtmp));
110 >                d2 *= d2;
111 >                d2 = (DOT(vtmp,vtmp) - d2) / d2;
112                                                  /* gaussian */
113                  dtmp = exp(-d2/dtmp)/(4.*PI*dtmp);
114                                                  /* worth using? */

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