19 |
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#include "otypes.h" |
20 |
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#include "rtotypes.h" |
21 |
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#include "random.h" |
22 |
+ |
#include "pmapmat.h" |
23 |
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|
24 |
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#ifndef MAXITER |
25 |
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#define MAXITER 10 /* maximum # specular ray attempts */ |
66 |
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double pdot; /* perturbed dot product */ |
67 |
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} NORMDAT; /* normal material data */ |
68 |
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|
69 |
< |
static srcdirf_t dirnorm; |
69 |
< |
static void gaussamp(RAY *r, NORMDAT *np); |
69 |
> |
static void gaussamp(NORMDAT *np); |
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|
71 |
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|
72 |
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static void |
73 |
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dirnorm( /* compute source contribution */ |
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COLOR cval, /* returned coefficient */ |
75 |
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void *nnp, /* material data */ |
75 |
> |
void *nnp, /* material data */ |
76 |
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FVECT ldir, /* light source direction */ |
77 |
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double omega /* light source size */ |
78 |
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) |
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{ |
80 |
< |
register NORMDAT *np = nnp; |
80 |
> |
NORMDAT *np = nnp; |
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double ldot; |
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double lrdiff, ltdiff; |
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double dtmp, d2, d3, d4; |
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scalecolor(ctmp, dtmp); |
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addcolor(cval, ctmp); |
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} |
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|
116 |
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if (ldot < -FTINY && ltdiff > FTINY) { |
117 |
+ |
/* |
118 |
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* Compute diffuse transmission. |
119 |
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*/ |
120 |
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copycolor(ctmp, np->mcolor); |
121 |
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dtmp = -ldot * omega * ltdiff * (1.0/PI); |
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scalecolor(ctmp, dtmp); |
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addcolor(cval, ctmp); |
124 |
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} |
125 |
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|
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if (ldot > FTINY && (np->specfl&(SP_REFL|SP_PURE)) == SP_REFL) { |
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/* |
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* Compute specular reflection coefficient using |
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if (np->specfl & SP_FLAT) |
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dtmp += omega * (0.25/PI); |
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/* half vector */ |
137 |
< |
vtmp[0] = ldir[0] - np->rp->rdir[0]; |
127 |
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vtmp[1] = ldir[1] - np->rp->rdir[1]; |
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< |
vtmp[2] = ldir[2] - np->rp->rdir[2]; |
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> |
VSUB(vtmp, ldir, np->rp->rdir); |
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d2 = DOT(vtmp, np->pnorm); |
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d2 *= d2; |
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d3 = DOT(vtmp,vtmp); |
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addcolor(cval, ctmp); |
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} |
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} |
152 |
< |
if (ldot < -FTINY && ltdiff > FTINY) { |
153 |
< |
/* |
145 |
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* Compute diffuse transmission. |
146 |
< |
*/ |
147 |
< |
copycolor(ctmp, np->mcolor); |
148 |
< |
dtmp = -ldot * omega * ltdiff * (1.0/PI); |
149 |
< |
scalecolor(ctmp, dtmp); |
150 |
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addcolor(cval, ctmp); |
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< |
} |
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> |
|
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|
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if (ldot < -FTINY && (np->specfl&(SP_TRAN|SP_PURE)) == SP_TRAN) { |
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/* |
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* Compute specular transmission. Specular transmission |
171 |
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} |
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|
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|
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extern int |
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> |
int |
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m_normal( /* color a ray that hit something normal */ |
176 |
< |
register OBJREC *m, |
177 |
< |
register RAY *r |
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> |
OBJREC *m, |
177 |
> |
RAY *r |
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) |
179 |
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{ |
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NORMDAT nd; |
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int hastexture; |
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double d; |
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COLOR ctmp; |
187 |
< |
register int i; |
187 |
> |
int i; |
188 |
> |
|
189 |
> |
/* PMAP: skip transmitted shadow ray if accounted for in photon map */ |
190 |
> |
if (shadowRayInPmap(r)) |
191 |
> |
return(1); |
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/* easy shadow test */ |
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if (r->crtype & SHADOW && m->otype != MAT_TRANS) |
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return(1); |
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objerror(m, USER, "bad number of arguments"); |
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/* check for back side */ |
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if (r->rod < 0.0) { |
200 |
< |
if (!backvis && m->otype != MAT_TRANS) { |
200 |
> |
if (!backvis) { |
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raytrans(r); |
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return(1); |
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} |
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nd.rspec = m->oargs.farg[3]; |
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/* compute Fresnel approx. */ |
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if (nd.specfl & SP_PURE && nd.rspec >= FRESTHRESH) { |
236 |
< |
fest = FRESNE(r->rod); |
236 |
> |
fest = FRESNE(nd.pdot); |
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nd.rspec += fest*(1. - nd.rspec); |
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} else |
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fest = 0.; |
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if (!(nd.specfl & SP_PURE) && |
249 |
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specthresh >= nd.tspec-FTINY) |
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nd.specfl |= SP_TBLT; |
251 |
< |
if (!hastexture || r->crtype & SHADOW) { |
251 |
> |
if (!hastexture || r->crtype & (SHADOW|AMBIENT)) { |
252 |
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VCOPY(nd.prdir, r->rdir); |
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transtest = 2; |
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} else { |
263 |
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} else |
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nd.tdiff = nd.tspec = nd.trans = 0.0; |
265 |
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/* transmitted ray */ |
266 |
+ |
|
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if ((nd.specfl&(SP_TRAN|SP_PURE|SP_TBLT)) == (SP_TRAN|SP_PURE)) { |
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RAY lr; |
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copycolor(lr.rcoef, nd.mcolor); /* modified by color */ |
290 |
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if (m->otype != MAT_METAL) { |
291 |
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setcolor(nd.scolor, nd.rspec, nd.rspec, nd.rspec); |
292 |
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} else if (fest > FTINY) { |
293 |
< |
d = nd.rspec*(1. - fest); |
293 |
> |
d = m->oargs.farg[3]*(1. - fest); |
294 |
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for (i = 0; i < 3; i++) |
295 |
< |
nd.scolor[i] = fest + nd.mcolor[i]*d; |
295 |
> |
colval(nd.scolor,i) = fest + |
296 |
> |
colval(nd.mcolor,i)*d; |
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} else { |
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copycolor(nd.scolor, nd.mcolor); |
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scalecolor(nd.scolor, nd.rspec); |
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if (!(nd.specfl & SP_PURE) && specthresh >= nd.rspec-FTINY) |
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nd.specfl |= SP_RBLT; |
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/* compute reflected ray */ |
305 |
< |
for (i = 0; i < 3; i++) |
298 |
< |
nd.vrefl[i] = r->rdir[i] + 2.*nd.pdot*nd.pnorm[i]; |
305 |
> |
VSUM(nd.vrefl, r->rdir, nd.pnorm, 2.*nd.pdot); |
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/* penetration? */ |
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if (hastexture && DOT(nd.vrefl, r->ron) <= FTINY) |
308 |
< |
for (i = 0; i < 3; i++) /* safety measure */ |
302 |
< |
nd.vrefl[i] = r->rdir[i] + 2.*r->rod*r->ron[i]; |
308 |
> |
VSUM(nd.vrefl, r->rdir, r->ron, 2.*r->rod); |
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checknorm(nd.vrefl); |
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} |
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/* reflected ray */ |
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rayvalue(&lr); |
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multcolor(lr.rcol, lr.rcoef); |
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addcolor(r->rcol, lr.rcol); |
319 |
< |
if (!hastexture && nd.specfl & SP_FLAT) { |
319 |
> |
if (nd.specfl & SP_FLAT && |
320 |
> |
!hastexture | (r->crtype & AMBIENT)) { |
321 |
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mirtest = 2.*bright(lr.rcol); |
322 |
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mirdist = r->rot + lr.rt; |
323 |
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} |
330 |
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return(1); /* 100% pure specular */ |
331 |
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|
332 |
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if (!(nd.specfl & SP_PURE)) |
333 |
< |
gaussamp(r, &nd); /* checks *BLT flags */ |
333 |
> |
gaussamp(&nd); /* checks *BLT flags */ |
334 |
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|
335 |
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if (nd.rdiff > FTINY) { /* ambient from this side */ |
336 |
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copycolor(ctmp, nd.mcolor); /* modified by material color */ |
337 |
< |
if (nd.specfl & SP_RBLT) |
338 |
< |
scalecolor(ctmp, 1.0-nd.trans); |
339 |
< |
else |
333 |
< |
scalecolor(ctmp, nd.rdiff); |
337 |
> |
scalecolor(ctmp, nd.rdiff); |
338 |
> |
if (nd.specfl & SP_RBLT) /* add in specular as well? */ |
339 |
> |
addcolor(ctmp, nd.scolor); |
340 |
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multambient(ctmp, r, hastexture ? nd.pnorm : r->ron); |
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addcolor(r->rcol, ctmp); /* add to returned color */ |
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} |
373 |
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|
374 |
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static void |
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gaussamp( /* sample Gaussian specular */ |
376 |
< |
RAY *r, |
371 |
< |
register NORMDAT *np |
376 |
> |
NORMDAT *np |
377 |
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) |
378 |
|
{ |
379 |
|
RAY sr; |
380 |
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FVECT u, v, h; |
381 |
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double rv[2]; |
382 |
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double d, sinp, cosp; |
383 |
< |
int niter; |
384 |
< |
register int i; |
383 |
> |
COLOR scol; |
384 |
> |
int maxiter, ntrials, nstarget, nstaken; |
385 |
> |
int i; |
386 |
|
/* quick test */ |
387 |
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if ((np->specfl & (SP_REFL|SP_RBLT)) != SP_REFL && |
388 |
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(np->specfl & (SP_TRAN|SP_TBLT)) != SP_TRAN) |
389 |
|
return; |
390 |
|
/* set up sample coordinates */ |
391 |
< |
v[0] = v[1] = v[2] = 0.0; |
386 |
< |
for (i = 0; i < 3; i++) |
387 |
< |
if (np->pnorm[i] < 0.6 && np->pnorm[i] > -0.6) |
388 |
< |
break; |
389 |
< |
v[i] = 1.0; |
390 |
< |
fcross(u, v, np->pnorm); |
391 |
< |
normalize(u); |
391 |
> |
getperpendicular(u, np->pnorm, rand_samp); |
392 |
|
fcross(v, np->pnorm, u); |
393 |
|
/* compute reflection */ |
394 |
|
if ((np->specfl & (SP_REFL|SP_RBLT)) == SP_REFL && |
395 |
< |
rayorigin(&sr, SPECULAR, r, np->scolor) == 0) { |
396 |
< |
dimlist[ndims++] = (int)np->mp; |
397 |
< |
for (niter = 0; niter < MAXITER; niter++) { |
398 |
< |
if (niter) |
395 |
> |
rayorigin(&sr, SPECULAR, np->rp, np->scolor) == 0) { |
396 |
> |
nstarget = 1; |
397 |
> |
if (specjitter > 1.5) { /* multiple samples? */ |
398 |
> |
nstarget = specjitter*np->rp->rweight + .5; |
399 |
> |
if (sr.rweight <= minweight*nstarget) |
400 |
> |
nstarget = sr.rweight/minweight; |
401 |
> |
if (nstarget > 1) { |
402 |
> |
d = 1./nstarget; |
403 |
> |
scalecolor(sr.rcoef, d); |
404 |
> |
sr.rweight *= d; |
405 |
> |
} else |
406 |
> |
nstarget = 1; |
407 |
> |
} |
408 |
> |
setcolor(scol, 0., 0., 0.); |
409 |
> |
dimlist[ndims++] = (int)(size_t)np->mp; |
410 |
> |
maxiter = MAXITER*nstarget; |
411 |
> |
for (nstaken = ntrials = 0; nstaken < nstarget && |
412 |
> |
ntrials < maxiter; ntrials++) { |
413 |
> |
if (ntrials) |
414 |
|
d = frandom(); |
415 |
|
else |
416 |
|
d = urand(ilhash(dimlist,ndims)+samplendx); |
418 |
|
d = 2.0*PI * rv[0]; |
419 |
|
cosp = tcos(d); |
420 |
|
sinp = tsin(d); |
421 |
< |
rv[1] = 1.0 - specjitter*rv[1]; |
421 |
> |
if ((0. <= specjitter) & (specjitter < 1.)) |
422 |
> |
rv[1] = 1.0 - specjitter*rv[1]; |
423 |
|
if (rv[1] <= FTINY) |
424 |
|
d = 1.0; |
425 |
|
else |
426 |
|
d = sqrt( np->alpha2 * -log(rv[1]) ); |
427 |
|
for (i = 0; i < 3; i++) |
428 |
|
h[i] = np->pnorm[i] + d*(cosp*u[i] + sinp*v[i]); |
429 |
< |
d = -2.0 * DOT(h, r->rdir) / (1.0 + d*d); |
430 |
< |
for (i = 0; i < 3; i++) |
431 |
< |
sr.rdir[i] = r->rdir[i] + d*h[i]; |
432 |
< |
if (DOT(sr.rdir, r->ron) > FTINY) { |
429 |
> |
d = -2.0 * DOT(h, np->rp->rdir) / (1.0 + d*d); |
430 |
> |
VSUM(sr.rdir, np->rp->rdir, h, d); |
431 |
> |
/* sample rejection test */ |
432 |
> |
if ((d = DOT(sr.rdir, np->rp->ron)) <= FTINY) |
433 |
> |
continue; |
434 |
> |
checknorm(sr.rdir); |
435 |
> |
if (nstarget > 1) { /* W-G-M-D adjustment */ |
436 |
> |
if (nstaken) rayclear(&sr); |
437 |
|
rayvalue(&sr); |
438 |
+ |
d = 2./(1. + np->rp->rod/d); |
439 |
+ |
scalecolor(sr.rcol, d); |
440 |
+ |
addcolor(scol, sr.rcol); |
441 |
+ |
} else { |
442 |
+ |
rayvalue(&sr); |
443 |
|
multcolor(sr.rcol, sr.rcoef); |
444 |
< |
addcolor(r->rcol, sr.rcol); |
420 |
< |
break; |
444 |
> |
addcolor(np->rp->rcol, sr.rcol); |
445 |
|
} |
446 |
+ |
++nstaken; |
447 |
|
} |
448 |
+ |
if (nstarget > 1) { /* final W-G-M-D weighting */ |
449 |
+ |
multcolor(scol, sr.rcoef); |
450 |
+ |
d = (double)nstarget/ntrials; |
451 |
+ |
scalecolor(scol, d); |
452 |
+ |
addcolor(np->rp->rcol, scol); |
453 |
+ |
} |
454 |
|
ndims--; |
455 |
|
} |
456 |
|
/* compute transmission */ |
457 |
|
copycolor(sr.rcoef, np->mcolor); /* modified by color */ |
458 |
|
scalecolor(sr.rcoef, np->tspec); |
459 |
|
if ((np->specfl & (SP_TRAN|SP_TBLT)) == SP_TRAN && |
460 |
< |
rayorigin(&sr, SPECULAR, r, sr.rcoef) == 0) { |
461 |
< |
dimlist[ndims++] = (int)np->mp; |
462 |
< |
for (niter = 0; niter < MAXITER; niter++) { |
463 |
< |
if (niter) |
460 |
> |
rayorigin(&sr, SPECULAR, np->rp, sr.rcoef) == 0) { |
461 |
> |
nstarget = 1; |
462 |
> |
if (specjitter > 1.5) { /* multiple samples? */ |
463 |
> |
nstarget = specjitter*np->rp->rweight + .5; |
464 |
> |
if (sr.rweight <= minweight*nstarget) |
465 |
> |
nstarget = sr.rweight/minweight; |
466 |
> |
if (nstarget > 1) { |
467 |
> |
d = 1./nstarget; |
468 |
> |
scalecolor(sr.rcoef, d); |
469 |
> |
sr.rweight *= d; |
470 |
> |
} else |
471 |
> |
nstarget = 1; |
472 |
> |
} |
473 |
> |
dimlist[ndims++] = (int)(size_t)np->mp; |
474 |
> |
maxiter = MAXITER*nstarget; |
475 |
> |
for (nstaken = ntrials = 0; nstaken < nstarget && |
476 |
> |
ntrials < maxiter; ntrials++) { |
477 |
> |
if (ntrials) |
478 |
|
d = frandom(); |
479 |
|
else |
480 |
< |
d = urand(ilhash(dimlist,ndims)+1823+samplendx); |
480 |
> |
d = urand(ilhash(dimlist,ndims)+samplendx); |
481 |
|
multisamp(rv, 2, d); |
482 |
|
d = 2.0*PI * rv[0]; |
483 |
|
cosp = tcos(d); |
484 |
|
sinp = tsin(d); |
485 |
< |
rv[1] = 1.0 - specjitter*rv[1]; |
485 |
> |
if ((0. <= specjitter) & (specjitter < 1.)) |
486 |
> |
rv[1] = 1.0 - specjitter*rv[1]; |
487 |
|
if (rv[1] <= FTINY) |
488 |
|
d = 1.0; |
489 |
|
else |
490 |
|
d = sqrt( np->alpha2 * -log(rv[1]) ); |
491 |
|
for (i = 0; i < 3; i++) |
492 |
|
sr.rdir[i] = np->prdir[i] + d*(cosp*u[i] + sinp*v[i]); |
493 |
< |
if (DOT(sr.rdir, r->ron) < -FTINY) { |
494 |
< |
normalize(sr.rdir); /* OK, normalize */ |
495 |
< |
rayvalue(&sr); |
496 |
< |
multcolor(sr.rcol, sr.rcoef); |
497 |
< |
addcolor(r->rcol, sr.rcol); |
498 |
< |
break; |
499 |
< |
} |
493 |
> |
/* sample rejection test */ |
494 |
> |
if (DOT(sr.rdir, np->rp->ron) >= -FTINY) |
495 |
> |
continue; |
496 |
> |
normalize(sr.rdir); /* OK, normalize */ |
497 |
> |
if (nstaken) /* multi-sampling */ |
498 |
> |
rayclear(&sr); |
499 |
> |
rayvalue(&sr); |
500 |
> |
multcolor(sr.rcol, sr.rcoef); |
501 |
> |
addcolor(np->rp->rcol, sr.rcol); |
502 |
> |
++nstaken; |
503 |
|
} |
504 |
|
ndims--; |
505 |
|
} |