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Comparing ray/src/rt/normal.c (file contents):
Revision 2.20 by greg, Tue May 19 17:09:03 1992 UTC vs.
Revision 2.22 by greg, Fri Oct 16 10:20:29 1992 UTC

# Line 24 | Line 24 | extern double  specthresh;             /* specular sampling thres
24   extern double  specjitter;              /* specular sampling jitter */
25  
26   /*
27 < *      This routine uses portions of the reflection
28 < *  model described by Cook and Torrance.
29 < *      The computation of specular components has been simplified by
30 < *  numerous approximations and ommisions to improve speed.
27 > *      This routine implements the isotropic Gaussian
28 > *  model described by Ward in Siggraph `92 article.
29   *      We orient the surface towards the incoming ray, so a single
30   *  surface can be used to represent an infinitely thin object.
31   *
# Line 137 | Line 135 | double  omega;                 /* light source size */
135                                                  /* roughness + source */
136                  dtmp = np->alpha2 + omega/PI;
137                                                  /* gaussian */
138 <                dtmp = exp((2.*DOT(np->prdir,ldir)-2.)/dtmp)/(4.*PI*dtmp);
138 >                dtmp = exp((2.*DOT(np->prdir,ldir)-2.)/dtmp)/(PI*dtmp);
139                                                  /* worth using? */
140                  if (dtmp > FTINY) {
141                          copycolor(ctmp, np->mcolor);

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