| 64 |
|
} |
| 65 |
|
|
| 66 |
|
|
| 67 |
< |
extern int |
| 67 |
> |
int |
| 68 |
|
m_dielectric( /* color a ray which hit a dielectric interface */ |
| 69 |
|
OBJREC *m, |
| 70 |
< |
register RAY *r |
| 70 |
> |
RAY *r |
| 71 |
|
) |
| 72 |
|
{ |
| 73 |
|
double cos1, cos2, nratio; |
| 74 |
|
COLOR ctrans; |
| 75 |
|
COLOR talb; |
| 76 |
|
int hastexture; |
| 77 |
+ |
double transdist=0, transtest=0; |
| 78 |
+ |
double mirdist=0, mirtest=0; |
| 79 |
+ |
int flatsurface; |
| 80 |
|
double refl, trans; |
| 81 |
|
FVECT dnorm; |
| 82 |
|
double d1, d2; |
| 83 |
|
RAY p; |
| 84 |
< |
register int i; |
| 84 |
> |
int i; |
| 85 |
|
|
| 86 |
|
if (m->oargs.nfargs != (m->otype==MAT_DIELECTRIC ? 5 : 8)) |
| 87 |
|
objerror(m, USER, "bad arguments"); |
| 94 |
|
VCOPY(dnorm, r->ron); |
| 95 |
|
cos1 = r->rod; |
| 96 |
|
} |
| 97 |
+ |
flatsurface = r->ro != NULL && isflat(r->ro->otype) && |
| 98 |
+ |
!hastexture | (r->crtype & AMBIENT); |
| 99 |
+ |
|
| 100 |
|
/* index of refraction */ |
| 101 |
|
if (m->otype == MAT_DIELECTRIC) |
| 102 |
|
nratio = m->oargs.farg[3] + m->oargs.farg[4]/MLAMBDA; |
| 165 |
|
|
| 166 |
|
trans *= nratio*nratio; /* solid angle ratio */ |
| 167 |
|
|
| 168 |
< |
if (rayorigin(&p, r, REFRACTED, trans) == 0) { |
| 168 |
> |
setcolor(p.rcoef, trans, trans, trans); |
| 169 |
|
|
| 170 |
+ |
if (rayorigin(&p, REFRACTED, r, p.rcoef) == 0) { |
| 171 |
+ |
|
| 172 |
|
/* compute refracted ray */ |
| 173 |
|
d1 = nratio*cos1 - cos2; |
| 174 |
|
for (i = 0; i < 3; i++) |
| 181 |
|
p.rdir[i] = nratio*r->rdir[i] + |
| 182 |
|
d1*r->ron[i]; |
| 183 |
|
normalize(p.rdir); /* not exact */ |
| 184 |
< |
} |
| 184 |
> |
} else |
| 185 |
> |
checknorm(p.rdir); |
| 186 |
|
#ifdef DISPERSE |
| 187 |
|
if (m->otype != MAT_DIELECTRIC |
| 188 |
|
|| r->rod > 0.0 |
| 196 |
|
copycolor(p.cext, ctrans); |
| 197 |
|
copycolor(p.albedo, talb); |
| 198 |
|
rayvalue(&p); |
| 199 |
< |
scalecolor(p.rcol, trans); |
| 199 |
> |
multcolor(p.rcol, p.rcoef); |
| 200 |
|
addcolor(r->rcol, p.rcol); |
| 201 |
< |
if (nratio >= 1.0-FTINY && nratio <= 1.0+FTINY) |
| 202 |
< |
r->rt = r->rot + p.rt; |
| 201 |
> |
/* virtual distance */ |
| 202 |
> |
if (flatsurface || |
| 203 |
> |
(1.-FTINY <= nratio) & |
| 204 |
> |
(nratio <= 1.+FTINY)) { |
| 205 |
> |
transtest = 2*bright(p.rcol); |
| 206 |
> |
transdist = r->rot + p.rt; |
| 207 |
> |
} |
| 208 |
|
} |
| 209 |
|
} |
| 210 |
|
} |
| 211 |
< |
|
| 211 |
> |
setcolor(p.rcoef, refl, refl, refl); |
| 212 |
> |
|
| 213 |
|
if (!(r->crtype & SHADOW) && |
| 214 |
< |
rayorigin(&p, r, REFLECTED, refl) == 0) { |
| 214 |
> |
rayorigin(&p, REFLECTED, r, p.rcoef) == 0) { |
| 215 |
|
|
| 216 |
|
/* compute reflected ray */ |
| 217 |
< |
for (i = 0; i < 3; i++) |
| 203 |
< |
p.rdir[i] = r->rdir[i] + 2.0*cos1*dnorm[i]; |
| 217 |
> |
VSUM(p.rdir, r->rdir, dnorm, 2.*cos1); |
| 218 |
|
/* accidental penetration? */ |
| 219 |
|
if (hastexture && DOT(p.rdir,r->ron)*hastexture <= FTINY) |
| 220 |
< |
for (i = 0; i < 3; i++) /* ignore texture */ |
| 221 |
< |
p.rdir[i] = r->rdir[i] + 2.0*r->rod*r->ron[i]; |
| 208 |
< |
|
| 220 |
> |
VSUM(p.rdir, r->rdir, r->ron, 2.*r->rod); |
| 221 |
> |
checknorm(p.rdir); |
| 222 |
|
rayvalue(&p); /* reflected ray value */ |
| 223 |
|
|
| 224 |
< |
scalecolor(p.rcol, refl); /* color contribution */ |
| 224 |
> |
multcolor(p.rcol, p.rcoef); /* color contribution */ |
| 225 |
|
addcolor(r->rcol, p.rcol); |
| 226 |
+ |
/* virtual distance */ |
| 227 |
+ |
if (flatsurface) { |
| 228 |
+ |
mirtest = 2*bright(p.rcol); |
| 229 |
+ |
mirdist = r->rot + p.rt; |
| 230 |
+ |
} |
| 231 |
|
} |
| 232 |
+ |
/* check distance to return */ |
| 233 |
+ |
d1 = bright(r->rcol); |
| 234 |
+ |
if (transtest > d1) |
| 235 |
+ |
r->rt = transdist; |
| 236 |
+ |
else if (mirtest > d1) |
| 237 |
+ |
r->rt = mirdist; |
| 238 |
|
/* rayvalue() computes absorption */ |
| 239 |
|
return(1); |
| 240 |
|
} |
| 252 |
|
COLOR abt |
| 253 |
|
) |
| 254 |
|
{ |
| 255 |
< |
RAY sray, *entray; |
| 255 |
> |
RAY sray; |
| 256 |
> |
const RAY *entray; |
| 257 |
|
FVECT v1, v2, n1, n2; |
| 258 |
|
FVECT dv, v2Xdv; |
| 259 |
|
double v2Xdvv2Xdv; |
| 308 |
|
VCOPY(n2, r->ron); |
| 309 |
|
|
| 310 |
|
/* first order dispersion approx. */ |
| 311 |
< |
dtmp1 = DOT(n1, v1); |
| 312 |
< |
dtmp2 = DOT(n2, v2); |
| 311 |
> |
dtmp1 = 1./DOT(n1, v1); |
| 312 |
> |
dtmp2 = 1./DOT(n2, v2); |
| 313 |
|
for (i = 0; i < 3; i++) |
| 314 |
< |
dv[i] = v1[i] + v2[i] - n1[i]/dtmp1 - n2[i]/dtmp2; |
| 314 |
> |
dv[i] = v1[i] + v2[i] - n1[i]*dtmp1 - n2[i]*dtmp2; |
| 315 |
|
|
| 316 |
|
if (DOT(dv, dv) <= FTINY) /* null effect */ |
| 317 |
|
return(0); |
| 354 |
|
dtmp1 = sqrt(si.dom / v2Xdvv2Xdv / PI); |
| 355 |
|
|
| 356 |
|
/* compute first ray */ |
| 357 |
< |
for (i = 0; i < 3; i++) |
| 333 |
< |
vtmp2[i] = sray.rdir[i] + dtmp1*vtmp1[i]; |
| 357 |
> |
VSUM(vtmp2, sray.rdir, vtmp1, dtmp1); |
| 358 |
|
|
| 359 |
|
l1 = lambda(m, v2, dv, vtmp2); /* first lambda */ |
| 360 |
|
if (l1 < 0) |
| 361 |
|
continue; |
| 362 |
|
/* compute second ray */ |
| 363 |
< |
for (i = 0; i < 3; i++) |
| 340 |
< |
vtmp2[i] = sray.rdir[i] - dtmp1*vtmp1[i]; |
| 363 |
> |
VSUM(vtmp2, sray.rdir, vtmp1, -dtmp1); |
| 364 |
|
|
| 365 |
|
l2 = lambda(m, v2, dv, vtmp2); /* second lambda */ |
| 366 |
|
if (l2 < 0) |
| 381 |
|
|
| 382 |
|
static int |
| 383 |
|
lambda( /* compute lambda for material */ |
| 384 |
< |
register OBJREC *m, |
| 384 |
> |
OBJREC *m, |
| 385 |
|
FVECT v2, |
| 386 |
|
FVECT dv, |
| 387 |
|
FVECT lr |
| 393 |
|
|
| 394 |
|
fcross(lrXdv, lr, dv); |
| 395 |
|
for (i = 0; i < 3; i++) |
| 396 |
< |
if (lrXdv[i] > FTINY || lrXdv[i] < -FTINY) |
| 396 |
> |
if ((lrXdv[i] > FTINY) | (lrXdv[i] < -FTINY)) |
| 397 |
|
break; |
| 398 |
|
if (i >= 3) |
| 399 |
|
return(-1); |
