65 |
|
double pdot; /* perturbed dot product */ |
66 |
|
} NORMDAT; /* normal material data */ |
67 |
|
|
68 |
< |
static srcdirf_t dirnorm; |
69 |
< |
static void gaussamp(RAY *r, NORMDAT *np); |
68 |
> |
static void gaussamp(NORMDAT *np); |
69 |
|
|
70 |
|
|
71 |
|
static void |
72 |
|
dirnorm( /* compute source contribution */ |
73 |
|
COLOR cval, /* returned coefficient */ |
74 |
< |
void *nnp, /* material data */ |
74 |
> |
void *nnp, /* material data */ |
75 |
|
FVECT ldir, /* light source direction */ |
76 |
|
double omega /* light source size */ |
77 |
|
) |
78 |
|
{ |
79 |
< |
register NORMDAT *np = nnp; |
79 |
> |
NORMDAT *np = nnp; |
80 |
|
double ldot; |
81 |
|
double lrdiff, ltdiff; |
82 |
< |
double dtmp, d2; |
82 |
> |
double dtmp, d2, d3, d4; |
83 |
|
FVECT vtmp; |
84 |
|
COLOR ctmp; |
85 |
|
|
114 |
|
if (ldot > FTINY && (np->specfl&(SP_REFL|SP_PURE)) == SP_REFL) { |
115 |
|
/* |
116 |
|
* Compute specular reflection coefficient using |
117 |
< |
* gaussian distribution model. |
117 |
> |
* Gaussian distribution model. |
118 |
|
*/ |
119 |
|
/* roughness */ |
120 |
|
dtmp = np->alpha2; |
122 |
|
if (np->specfl & SP_FLAT) |
123 |
|
dtmp += omega * (0.25/PI); |
124 |
|
/* half vector */ |
125 |
< |
vtmp[0] = ldir[0] - np->rp->rdir[0]; |
127 |
< |
vtmp[1] = ldir[1] - np->rp->rdir[1]; |
128 |
< |
vtmp[2] = ldir[2] - np->rp->rdir[2]; |
125 |
> |
VSUB(vtmp, ldir, np->rp->rdir); |
126 |
|
d2 = DOT(vtmp, np->pnorm); |
127 |
|
d2 *= d2; |
128 |
< |
d2 = (DOT(vtmp,vtmp) - d2) / d2; |
129 |
< |
/* gaussian */ |
130 |
< |
dtmp = exp(-d2/dtmp)/(4.*PI * np->pdot * dtmp); |
128 |
> |
d3 = DOT(vtmp,vtmp); |
129 |
> |
d4 = (d3 - d2) / d2; |
130 |
> |
/* new W-G-M-D model */ |
131 |
> |
dtmp = exp(-d4/dtmp) * d3 / (PI * d2*d2 * dtmp); |
132 |
|
/* worth using? */ |
133 |
|
if (dtmp > FTINY) { |
134 |
|
copycolor(ctmp, np->scolor); |
135 |
< |
dtmp *= omega; |
135 |
> |
dtmp *= ldot * omega; |
136 |
|
scalecolor(ctmp, dtmp); |
137 |
|
addcolor(cval, ctmp); |
138 |
|
} |
153 |
|
*/ |
154 |
|
/* roughness + source */ |
155 |
|
dtmp = np->alpha2 + omega*(1.0/PI); |
156 |
< |
/* gaussian */ |
157 |
< |
dtmp = exp((2.*DOT(np->prdir,ldir)-2.)/dtmp)/(PI*dtmp); |
156 |
> |
/* Gaussian */ |
157 |
> |
dtmp = exp((2.*DOT(np->prdir,ldir)-2.)/dtmp)/(PI*dtmp); |
158 |
|
/* worth using? */ |
159 |
|
if (dtmp > FTINY) { |
160 |
|
copycolor(ctmp, np->mcolor); |
166 |
|
} |
167 |
|
|
168 |
|
|
169 |
< |
extern int |
169 |
> |
int |
170 |
|
m_normal( /* color a ray that hit something normal */ |
171 |
< |
register OBJREC *m, |
172 |
< |
register RAY *r |
171 |
> |
OBJREC *m, |
172 |
> |
RAY *r |
173 |
|
) |
174 |
|
{ |
175 |
|
NORMDAT nd; |
179 |
|
int hastexture; |
180 |
|
double d; |
181 |
|
COLOR ctmp; |
182 |
< |
register int i; |
182 |
> |
int i; |
183 |
|
/* easy shadow test */ |
184 |
|
if (r->crtype & SHADOW && m->otype != MAT_TRANS) |
185 |
|
return(1); |
188 |
|
objerror(m, USER, "bad number of arguments"); |
189 |
|
/* check for back side */ |
190 |
|
if (r->rod < 0.0) { |
191 |
< |
if (!backvis && m->otype != MAT_TRANS) { |
191 |
> |
if (!backvis) { |
192 |
|
raytrans(r); |
193 |
|
return(1); |
194 |
|
} |
224 |
|
nd.rspec = m->oargs.farg[3]; |
225 |
|
/* compute Fresnel approx. */ |
226 |
|
if (nd.specfl & SP_PURE && nd.rspec >= FRESTHRESH) { |
227 |
< |
fest = FRESNE(r->rod); |
227 |
> |
fest = FRESNE(nd.pdot); |
228 |
|
nd.rspec += fest*(1. - nd.rspec); |
229 |
|
} else |
230 |
|
fest = 0.; |
239 |
|
if (!(nd.specfl & SP_PURE) && |
240 |
|
specthresh >= nd.tspec-FTINY) |
241 |
|
nd.specfl |= SP_TBLT; |
242 |
< |
if (!hastexture || r->crtype & SHADOW) { |
242 |
> |
if (!hastexture || r->crtype & (SHADOW|AMBIENT)) { |
243 |
|
VCOPY(nd.prdir, r->rdir); |
244 |
|
transtest = 2; |
245 |
|
} else { |
280 |
|
if (m->otype != MAT_METAL) { |
281 |
|
setcolor(nd.scolor, nd.rspec, nd.rspec, nd.rspec); |
282 |
|
} else if (fest > FTINY) { |
283 |
< |
d = nd.rspec*(1. - fest); |
283 |
> |
d = m->oargs.farg[3]*(1. - fest); |
284 |
|
for (i = 0; i < 3; i++) |
285 |
< |
nd.scolor[i] = fest + nd.mcolor[i]*d; |
285 |
> |
colval(nd.scolor,i) = fest + |
286 |
> |
colval(nd.mcolor,i)*d; |
287 |
|
} else { |
288 |
|
copycolor(nd.scolor, nd.mcolor); |
289 |
|
scalecolor(nd.scolor, nd.rspec); |
292 |
|
if (!(nd.specfl & SP_PURE) && specthresh >= nd.rspec-FTINY) |
293 |
|
nd.specfl |= SP_RBLT; |
294 |
|
/* compute reflected ray */ |
295 |
< |
for (i = 0; i < 3; i++) |
297 |
< |
nd.vrefl[i] = r->rdir[i] + 2.*nd.pdot*nd.pnorm[i]; |
295 |
> |
VSUM(nd.vrefl, r->rdir, nd.pnorm, 2.*nd.pdot); |
296 |
|
/* penetration? */ |
297 |
|
if (hastexture && DOT(nd.vrefl, r->ron) <= FTINY) |
298 |
< |
for (i = 0; i < 3; i++) /* safety measure */ |
299 |
< |
nd.vrefl[i] = r->rdir[i] + 2.*r->rod*r->ron[i]; |
298 |
> |
VSUM(nd.vrefl, r->rdir, r->ron, 2.*r->rod); |
299 |
> |
checknorm(nd.vrefl); |
300 |
|
} |
301 |
|
/* reflected ray */ |
302 |
|
if ((nd.specfl&(SP_REFL|SP_PURE|SP_RBLT)) == (SP_REFL|SP_PURE)) { |
306 |
|
rayvalue(&lr); |
307 |
|
multcolor(lr.rcol, lr.rcoef); |
308 |
|
addcolor(r->rcol, lr.rcol); |
309 |
< |
if (!hastexture && nd.specfl & SP_FLAT) { |
309 |
> |
if (nd.specfl & SP_FLAT && |
310 |
> |
!hastexture | (r->crtype & AMBIENT)) { |
311 |
|
mirtest = 2.*bright(lr.rcol); |
312 |
|
mirdist = r->rot + lr.rt; |
313 |
|
} |
320 |
|
return(1); /* 100% pure specular */ |
321 |
|
|
322 |
|
if (!(nd.specfl & SP_PURE)) |
323 |
< |
gaussamp(r, &nd); /* checks *BLT flags */ |
323 |
> |
gaussamp(&nd); /* checks *BLT flags */ |
324 |
|
|
325 |
|
if (nd.rdiff > FTINY) { /* ambient from this side */ |
326 |
|
copycolor(ctmp, nd.mcolor); /* modified by material color */ |
327 |
< |
if (nd.specfl & SP_RBLT) |
328 |
< |
scalecolor(ctmp, 1.0-nd.trans); |
329 |
< |
else |
331 |
< |
scalecolor(ctmp, nd.rdiff); |
327 |
> |
scalecolor(ctmp, nd.rdiff); |
328 |
> |
if (nd.specfl & SP_RBLT) /* add in specular as well? */ |
329 |
> |
addcolor(ctmp, nd.scolor); |
330 |
|
multambient(ctmp, r, hastexture ? nd.pnorm : r->ron); |
331 |
|
addcolor(r->rcol, ctmp); /* add to returned color */ |
332 |
|
} |
362 |
|
|
363 |
|
|
364 |
|
static void |
365 |
< |
gaussamp( /* sample gaussian specular */ |
366 |
< |
RAY *r, |
369 |
< |
register NORMDAT *np |
365 |
> |
gaussamp( /* sample Gaussian specular */ |
366 |
> |
NORMDAT *np |
367 |
|
) |
368 |
|
{ |
369 |
|
RAY sr; |
370 |
|
FVECT u, v, h; |
371 |
|
double rv[2]; |
372 |
|
double d, sinp, cosp; |
373 |
< |
int niter; |
374 |
< |
register int i; |
373 |
> |
COLOR scol; |
374 |
> |
int maxiter, ntrials, nstarget, nstaken; |
375 |
> |
int i; |
376 |
|
/* quick test */ |
377 |
|
if ((np->specfl & (SP_REFL|SP_RBLT)) != SP_REFL && |
378 |
|
(np->specfl & (SP_TRAN|SP_TBLT)) != SP_TRAN) |
379 |
|
return; |
380 |
|
/* set up sample coordinates */ |
381 |
< |
v[0] = v[1] = v[2] = 0.0; |
384 |
< |
for (i = 0; i < 3; i++) |
385 |
< |
if (np->pnorm[i] < 0.6 && np->pnorm[i] > -0.6) |
386 |
< |
break; |
387 |
< |
v[i] = 1.0; |
388 |
< |
fcross(u, v, np->pnorm); |
389 |
< |
normalize(u); |
381 |
> |
getperpendicular(u, np->pnorm); |
382 |
|
fcross(v, np->pnorm, u); |
383 |
|
/* compute reflection */ |
384 |
|
if ((np->specfl & (SP_REFL|SP_RBLT)) == SP_REFL && |
385 |
< |
rayorigin(&sr, SPECULAR, r, np->scolor) == 0) { |
386 |
< |
dimlist[ndims++] = (int)np->mp; |
387 |
< |
for (niter = 0; niter < MAXITER; niter++) { |
388 |
< |
if (niter) |
385 |
> |
rayorigin(&sr, SPECULAR, np->rp, np->scolor) == 0) { |
386 |
> |
nstarget = 1; |
387 |
> |
if (specjitter > 1.5) { /* multiple samples? */ |
388 |
> |
nstarget = specjitter*np->rp->rweight + .5; |
389 |
> |
if (sr.rweight <= minweight*nstarget) |
390 |
> |
nstarget = sr.rweight/minweight; |
391 |
> |
if (nstarget > 1) { |
392 |
> |
d = 1./nstarget; |
393 |
> |
scalecolor(sr.rcoef, d); |
394 |
> |
sr.rweight *= d; |
395 |
> |
} else |
396 |
> |
nstarget = 1; |
397 |
> |
} |
398 |
> |
setcolor(scol, 0., 0., 0.); |
399 |
> |
dimlist[ndims++] = (int)(size_t)np->mp; |
400 |
> |
maxiter = MAXITER*nstarget; |
401 |
> |
for (nstaken = ntrials = 0; nstaken < nstarget && |
402 |
> |
ntrials < maxiter; ntrials++) { |
403 |
> |
if (ntrials) |
404 |
|
d = frandom(); |
405 |
|
else |
406 |
|
d = urand(ilhash(dimlist,ndims)+samplendx); |
408 |
|
d = 2.0*PI * rv[0]; |
409 |
|
cosp = tcos(d); |
410 |
|
sinp = tsin(d); |
411 |
< |
rv[1] = 1.0 - specjitter*rv[1]; |
411 |
> |
if ((0. <= specjitter) & (specjitter < 1.)) |
412 |
> |
rv[1] = 1.0 - specjitter*rv[1]; |
413 |
|
if (rv[1] <= FTINY) |
414 |
|
d = 1.0; |
415 |
|
else |
416 |
|
d = sqrt( np->alpha2 * -log(rv[1]) ); |
417 |
|
for (i = 0; i < 3; i++) |
418 |
|
h[i] = np->pnorm[i] + d*(cosp*u[i] + sinp*v[i]); |
419 |
< |
d = -2.0 * DOT(h, r->rdir) / (1.0 + d*d); |
420 |
< |
for (i = 0; i < 3; i++) |
421 |
< |
sr.rdir[i] = r->rdir[i] + d*h[i]; |
422 |
< |
if (DOT(sr.rdir, r->ron) > FTINY) { |
419 |
> |
d = -2.0 * DOT(h, np->rp->rdir) / (1.0 + d*d); |
420 |
> |
VSUM(sr.rdir, np->rp->rdir, h, d); |
421 |
> |
/* sample rejection test */ |
422 |
> |
if ((d = DOT(sr.rdir, np->rp->ron)) <= FTINY) |
423 |
> |
continue; |
424 |
> |
checknorm(sr.rdir); |
425 |
> |
if (nstarget > 1) { /* W-G-M-D adjustment */ |
426 |
> |
if (nstaken) rayclear(&sr); |
427 |
|
rayvalue(&sr); |
428 |
+ |
d = 2./(1. + np->rp->rod/d); |
429 |
+ |
scalecolor(sr.rcol, d); |
430 |
+ |
addcolor(scol, sr.rcol); |
431 |
+ |
} else { |
432 |
+ |
rayvalue(&sr); |
433 |
|
multcolor(sr.rcol, sr.rcoef); |
434 |
< |
addcolor(r->rcol, sr.rcol); |
418 |
< |
break; |
434 |
> |
addcolor(np->rp->rcol, sr.rcol); |
435 |
|
} |
436 |
+ |
++nstaken; |
437 |
|
} |
438 |
+ |
if (nstarget > 1) { /* final W-G-M-D weighting */ |
439 |
+ |
multcolor(scol, sr.rcoef); |
440 |
+ |
d = (double)nstarget/ntrials; |
441 |
+ |
scalecolor(scol, d); |
442 |
+ |
addcolor(np->rp->rcol, scol); |
443 |
+ |
} |
444 |
|
ndims--; |
445 |
|
} |
446 |
|
/* compute transmission */ |
447 |
|
copycolor(sr.rcoef, np->mcolor); /* modified by color */ |
448 |
|
scalecolor(sr.rcoef, np->tspec); |
449 |
|
if ((np->specfl & (SP_TRAN|SP_TBLT)) == SP_TRAN && |
450 |
< |
rayorigin(&sr, SPECULAR, r, sr.rcoef) == 0) { |
451 |
< |
dimlist[ndims++] = (int)np->mp; |
452 |
< |
for (niter = 0; niter < MAXITER; niter++) { |
453 |
< |
if (niter) |
450 |
> |
rayorigin(&sr, SPECULAR, np->rp, sr.rcoef) == 0) { |
451 |
> |
nstarget = 1; |
452 |
> |
if (specjitter > 1.5) { /* multiple samples? */ |
453 |
> |
nstarget = specjitter*np->rp->rweight + .5; |
454 |
> |
if (sr.rweight <= minweight*nstarget) |
455 |
> |
nstarget = sr.rweight/minweight; |
456 |
> |
if (nstarget > 1) { |
457 |
> |
d = 1./nstarget; |
458 |
> |
scalecolor(sr.rcoef, d); |
459 |
> |
sr.rweight *= d; |
460 |
> |
} else |
461 |
> |
nstarget = 1; |
462 |
> |
} |
463 |
> |
dimlist[ndims++] = (int)(size_t)np->mp; |
464 |
> |
maxiter = MAXITER*nstarget; |
465 |
> |
for (nstaken = ntrials = 0; nstaken < nstarget && |
466 |
> |
ntrials < maxiter; ntrials++) { |
467 |
> |
if (ntrials) |
468 |
|
d = frandom(); |
469 |
|
else |
470 |
< |
d = urand(ilhash(dimlist,ndims)+1823+samplendx); |
470 |
> |
d = urand(ilhash(dimlist,ndims)+samplendx); |
471 |
|
multisamp(rv, 2, d); |
472 |
|
d = 2.0*PI * rv[0]; |
473 |
|
cosp = tcos(d); |
474 |
|
sinp = tsin(d); |
475 |
< |
rv[1] = 1.0 - specjitter*rv[1]; |
475 |
> |
if ((0. <= specjitter) & (specjitter < 1.)) |
476 |
> |
rv[1] = 1.0 - specjitter*rv[1]; |
477 |
|
if (rv[1] <= FTINY) |
478 |
|
d = 1.0; |
479 |
|
else |
480 |
|
d = sqrt( np->alpha2 * -log(rv[1]) ); |
481 |
|
for (i = 0; i < 3; i++) |
482 |
|
sr.rdir[i] = np->prdir[i] + d*(cosp*u[i] + sinp*v[i]); |
483 |
< |
if (DOT(sr.rdir, r->ron) < -FTINY) { |
484 |
< |
normalize(sr.rdir); /* OK, normalize */ |
485 |
< |
rayvalue(&sr); |
486 |
< |
multcolor(sr.rcol, sr.rcoef); |
487 |
< |
addcolor(r->rcol, sr.rcol); |
488 |
< |
break; |
489 |
< |
} |
483 |
> |
/* sample rejection test */ |
484 |
> |
if (DOT(sr.rdir, np->rp->ron) >= -FTINY) |
485 |
> |
continue; |
486 |
> |
normalize(sr.rdir); /* OK, normalize */ |
487 |
> |
if (nstaken) /* multi-sampling */ |
488 |
> |
rayclear(&sr); |
489 |
> |
rayvalue(&sr); |
490 |
> |
multcolor(sr.rcol, sr.rcoef); |
491 |
> |
addcolor(np->rp->rcol, sr.rcol); |
492 |
> |
++nstaken; |
493 |
|
} |
494 |
|
ndims--; |
495 |
|
} |