| 38 |
|
|
| 39 |
|
typedef struct { |
| 40 |
|
OBJREC *mp; /* material pointer */ |
| 41 |
– |
RAY *pr; /* intersected ray */ |
| 41 |
|
COLOR mcolor; /* color of this material */ |
| 42 |
|
COLOR scolor; /* color of specular component */ |
| 43 |
|
FVECT vrefl; /* vector in direction of reflected ray */ |
| 44 |
+ |
FVECT prdir; /* vector in transmitted direction */ |
| 45 |
|
double alpha2; /* roughness squared times 2 */ |
| 46 |
|
double rdiff, rspec; /* reflected specular, diffuse */ |
| 47 |
|
double trans; /* transmissivity */ |
| 113 |
|
/* roughness + source */ |
| 114 |
|
dtmp = np->alpha2 + omega/(2.0*PI); |
| 115 |
|
/* gaussian */ |
| 116 |
< |
dtmp = exp((DOT(np->pr->rdir,ldir)-1.)/dtmp)/(2.*PI)/dtmp; |
| 116 |
> |
dtmp = exp((DOT(np->prdir,ldir)-1.)/dtmp)/(2.*PI)/dtmp; |
| 117 |
|
/* worth using? */ |
| 118 |
|
if (dtmp > FTINY) { |
| 119 |
|
copycolor(ctmp, np->mcolor); |
| 141 |
|
if (r->crtype & SHADOW && m->otype != MAT_TRANS) |
| 142 |
|
return; |
| 143 |
|
nd.mp = m; |
| 144 |
– |
nd.pr = r; |
| 144 |
|
/* get material color */ |
| 145 |
|
setcolor(nd.mcolor, m->oargs.farg[0], |
| 146 |
|
m->oargs.farg[1], |
| 192 |
|
nd.trans = m->oargs.farg[5]*(1.0 - nd.rspec); |
| 193 |
|
nd.tspec = nd.trans * m->oargs.farg[6]; |
| 194 |
|
nd.tdiff = nd.trans - nd.tspec; |
| 195 |
+ |
if (r->crtype & SHADOW || DOT(r->pert,r->pert) <= FTINY*FTINY) { |
| 196 |
+ |
VCOPY(nd.prdir, r->rdir); |
| 197 |
+ |
transtest = 2; |
| 198 |
+ |
} else { |
| 199 |
+ |
for (i = 0; i < 3; i++) /* perturb direction */ |
| 200 |
+ |
nd.prdir[i] = r->rdir[i] - .75*r->pert[i]; |
| 201 |
+ |
normalize(nd.prdir); |
| 202 |
+ |
} |
| 203 |
|
} else |
| 204 |
|
nd.tdiff = nd.tspec = nd.trans = 0.0; |
| 205 |
|
/* transmitted ray */ |
| 206 |
|
if (nd.tspec > FTINY && nd.alpha2 <= FTINY) { |
| 207 |
|
RAY lr; |
| 208 |
|
if (rayorigin(&lr, r, TRANS, nd.tspec) == 0) { |
| 209 |
< |
if (!(r->crtype & SHADOW) && |
| 203 |
< |
DOT(r->pert,r->pert) > FTINY*FTINY) { |
| 204 |
< |
for (i = 0; i < 3; i++) /* perturb direction */ |
| 205 |
< |
lr.rdir[i] = r->rdir[i] - |
| 206 |
< |
.75*r->pert[i]; |
| 207 |
< |
normalize(lr.rdir); |
| 208 |
< |
} else { |
| 209 |
< |
VCOPY(lr.rdir, r->rdir); |
| 210 |
< |
transtest = 2; |
| 211 |
< |
} |
| 209 |
> |
VCOPY(lr.rdir, nd.prdir); |
| 210 |
|
rayvalue(&lr); |
| 211 |
|
scalecolor(lr.rcol, nd.tspec); |
| 212 |
|
multcolor(lr.rcol, nd.mcolor); /* modified by color */ |
