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root/radiance/ray/src/rt/aniso.c
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Comparing ray/src/rt/aniso.c (file contents):
Revision 2.20 by greg, Wed May 20 14:23:45 1992 UTC vs.
Revision 2.22 by greg, Fri Oct 16 10:20:27 1992 UTC

# Line 20 | Line 20 | extern double  specthresh;             /* specular sampling thres
20   extern double  specjitter;              /* specular sampling jitter */
21  
22   /*
23 < *      This anisotropic reflection model uses a variant on the
24 < *  exponential Gaussian used in normal.c.
23 > *      This routine implements the anisotropic Gaussian
24 > *  model described by Ward in Siggraph `92 article.
25   *      We orient the surface towards the incoming ray, so a single
26   *  surface can be used to represent an infinitely thin object.
27   *
# Line 117 | Line 117 | double  omega;                 /* light source size */
117                  dtmp2 *= dtmp2 / av2;
118                                                  /* gaussian */
119                  dtmp = (dtmp1 + dtmp2) / (1.0 + DOT(np->pnorm, h));
120 <                dtmp = exp(-2.0*dtmp) * 1.0/(4.0*PI)
120 >                dtmp = exp(-2.0*dtmp) * (1.0/4.0/PI)
121                                  * sqrt(ldot/(np->pdot*au2*av2));
122                                                  /* worth using? */
123                  if (dtmp > FTINY) {
# Line 163 | Line 163 | double  omega;                 /* light source size */
163                  } else
164                          dtmp = 0.0;
165                                                  /* gaussian */
166 <                dtmp = exp(-dtmp) * 1.0/PI
166 >                dtmp = exp(-dtmp) * (1.0/PI)
167                                  * sqrt(-ldot/(np->pdot*au2*av2));
168                                                  /* worth using? */
169                  if (dtmp > FTINY) {

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