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); |
70 |
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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 */ |
74 |
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COLOR cval, /* returned coefficient */ |
75 |
< |
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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) |
79 |
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{ |
80 |
< |
register NORMDAT *np = nnp; |
80 |
> |
NORMDAT *np = nnp; |
81 |
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double ldot; |
82 |
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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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} |
115 |
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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 |
+ |
dtmp = -ldot * omega * ltdiff * (1.0/PI); |
122 |
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scalecolor(ctmp, dtmp); |
123 |
+ |
addcolor(cval, ctmp); |
124 |
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} |
125 |
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|
126 |
+ |
if (ambRayInPmap(np->rp)) |
127 |
+ |
return; /* specular already in photon map */ |
128 |
+ |
|
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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 |
137 |
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if (np->specfl & SP_FLAT) |
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dtmp += omega * (0.25/PI); |
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/* half vector */ |
140 |
< |
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]; |
140 |
> |
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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} |
155 |
< |
if (ldot < -FTINY && ltdiff > FTINY) { |
156 |
< |
/* |
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 |
< |
addcolor(cval, ctmp); |
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< |
} |
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> |
|
156 |
> |
|
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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 |
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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 */ |
179 |
< |
register OBJREC *m, |
180 |
< |
register RAY *r |
179 |
> |
OBJREC *m, |
180 |
> |
RAY *r |
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) |
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{ |
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NORMDAT nd; |
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double fest; |
180 |
– |
double transtest, transdist; |
181 |
– |
double mirtest, mirdist; |
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int hastexture; |
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double d; |
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COLOR ctmp; |
188 |
< |
register int i; |
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> |
int i; |
189 |
> |
|
190 |
> |
/* PMAP: skip transmitted shadow ray if accounted for in photon map */ |
191 |
> |
/* No longer needed? |
192 |
> |
if (shadowRayInPmap(r) || ambRayInPmap(r)) |
193 |
> |
return(1); */ |
194 |
> |
|
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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) { |
203 |
< |
if (!backvis && m->otype != MAT_TRANS) { |
203 |
> |
if (!backvis) { |
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raytrans(r); |
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return(1); |
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} |
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if (nd.pdot < .001) |
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nd.pdot = .001; /* non-zero for dirnorm() */ |
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multcolor(nd.mcolor, r->pcol); /* modify material color */ |
225 |
– |
mirtest = transtest = 0; |
226 |
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mirdist = transdist = r->rot; |
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nd.rspec = m->oargs.farg[3]; |
235 |
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/* compute Fresnel approx. */ |
236 |
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if (nd.specfl & SP_PURE && nd.rspec >= FRESTHRESH) { |
237 |
< |
fest = FRESNE(r->rod); |
237 |
> |
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) && |
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specthresh >= nd.tspec-FTINY) |
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nd.specfl |= SP_TBLT; |
252 |
< |
if (!hastexture || r->crtype & SHADOW) { |
252 |
> |
if (!hastexture || r->crtype & (SHADOW|AMBIENT)) { |
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VCOPY(nd.prdir, r->rdir); |
247 |
– |
transtest = 2; |
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} else { |
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for (i = 0; i < 3; i++) /* perturb */ |
256 |
< |
nd.prdir[i] = r->rdir[i] - r->pert[i]; |
255 |
> |
/* perturb */ |
256 |
> |
VSUB(nd.prdir, r->rdir, r->pert); |
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if (DOT(nd.prdir, r->ron) < -FTINY) |
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normalize(nd.prdir); /* OK */ |
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else |
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} |
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} else |
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nd.tdiff = nd.tspec = nd.trans = 0.0; |
265 |
+ |
/* diffuse reflection */ |
266 |
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nd.rdiff = 1.0 - nd.trans - nd.rspec; |
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/* transmitted ray */ |
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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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rayvalue(&lr); |
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multcolor(lr.rcol, lr.rcoef); |
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addcolor(r->rcol, lr.rcol); |
277 |
< |
transtest *= bright(lr.rcol); |
278 |
< |
transdist = r->rot + lr.rt; |
277 |
> |
if (nd.tspec >= 1.0-FTINY) { |
278 |
> |
/* completely transparent */ |
279 |
> |
multcolor(lr.mcol, lr.rcoef); |
280 |
> |
copycolor(r->mcol, lr.mcol); |
281 |
> |
r->rmt = r->rot + lr.rmt; |
282 |
> |
r->rxt = r->rot + lr.rxt; |
283 |
> |
} else if (nd.tspec > nd.tdiff + nd.rdiff) |
284 |
> |
r->rxt = r->rot + raydistance(&lr); |
285 |
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} |
286 |
< |
} else |
273 |
< |
transtest = 0; |
286 |
> |
} |
287 |
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|
288 |
< |
if (r->crtype & SHADOW) { /* the rest is shadow */ |
276 |
< |
r->rt = transdist; |
288 |
> |
if (r->crtype & SHADOW) /* the rest is shadow */ |
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return(1); |
278 |
– |
} |
290 |
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/* get specular reflection */ |
291 |
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if (nd.rspec > FTINY) { |
292 |
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nd.specfl |= SP_REFL; |
294 |
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if (m->otype != MAT_METAL) { |
295 |
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setcolor(nd.scolor, nd.rspec, nd.rspec, nd.rspec); |
296 |
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} else if (fest > FTINY) { |
297 |
< |
d = nd.rspec*(1. - fest); |
297 |
> |
d = m->oargs.farg[3]*(1. - fest); |
298 |
|
for (i = 0; i < 3; i++) |
299 |
< |
nd.scolor[i] = fest + nd.mcolor[i]*d; |
299 |
> |
colval(nd.scolor,i) = fest + |
300 |
> |
colval(nd.mcolor,i)*d; |
301 |
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} else { |
302 |
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copycolor(nd.scolor, nd.mcolor); |
303 |
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scalecolor(nd.scolor, nd.rspec); |
319 |
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VCOPY(lr.rdir, nd.vrefl); |
320 |
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rayvalue(&lr); |
321 |
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multcolor(lr.rcol, lr.rcoef); |
322 |
+ |
copycolor(r->mcol, lr.rcol); |
323 |
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addcolor(r->rcol, lr.rcol); |
324 |
< |
if (!hastexture && nd.specfl & SP_FLAT) { |
325 |
< |
mirtest = 2.*bright(lr.rcol); |
326 |
< |
mirdist = r->rot + lr.rt; |
314 |
< |
} |
324 |
> |
if (nd.specfl & SP_FLAT && |
325 |
> |
!hastexture | (r->crtype & AMBIENT)) |
326 |
> |
r->rmt = r->rot + raydistance(&lr); |
327 |
|
} |
328 |
|
} |
317 |
– |
/* diffuse reflection */ |
318 |
– |
nd.rdiff = 1.0 - nd.trans - nd.rspec; |
329 |
|
|
330 |
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if (nd.specfl & SP_PURE && nd.rdiff <= FTINY && nd.tdiff <= FTINY) |
331 |
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return(1); /* 100% pure specular */ |
332 |
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|
333 |
|
if (!(nd.specfl & SP_PURE)) |
334 |
< |
gaussamp(r, &nd); /* checks *BLT flags */ |
334 |
> |
gaussamp(&nd); /* checks *BLT flags */ |
335 |
|
|
336 |
|
if (nd.rdiff > FTINY) { /* ambient from this side */ |
337 |
|
copycolor(ctmp, nd.mcolor); /* modified by material color */ |
338 |
< |
if (nd.specfl & SP_RBLT) |
339 |
< |
scalecolor(ctmp, 1.0-nd.trans); |
340 |
< |
else |
331 |
< |
scalecolor(ctmp, nd.rdiff); |
338 |
> |
scalecolor(ctmp, nd.rdiff); |
339 |
> |
if (nd.specfl & SP_RBLT) /* add in specular as well? */ |
340 |
> |
addcolor(ctmp, nd.scolor); |
341 |
|
multambient(ctmp, r, hastexture ? nd.pnorm : r->ron); |
342 |
|
addcolor(r->rcol, ctmp); /* add to returned color */ |
343 |
|
} |
361 |
|
} |
362 |
|
/* add direct component */ |
363 |
|
direct(r, dirnorm, &nd); |
355 |
– |
/* check distance */ |
356 |
– |
d = bright(r->rcol); |
357 |
– |
if (transtest > d) |
358 |
– |
r->rt = transdist; |
359 |
– |
else if (mirtest > d) |
360 |
– |
r->rt = mirdist; |
364 |
|
|
365 |
|
return(1); |
366 |
|
} |
368 |
|
|
369 |
|
static void |
370 |
|
gaussamp( /* sample Gaussian specular */ |
371 |
< |
RAY *r, |
369 |
< |
register NORMDAT *np |
371 |
> |
NORMDAT *np |
372 |
|
) |
373 |
|
{ |
374 |
|
RAY sr; |
375 |
|
FVECT u, v, h; |
376 |
|
double rv[2]; |
377 |
|
double d, sinp, cosp; |
378 |
< |
COLOR scol; |
378 |
> |
COLOR scol; |
379 |
|
int maxiter, ntrials, nstarget, nstaken; |
380 |
< |
register int i; |
380 |
> |
int i; |
381 |
|
/* quick test */ |
382 |
|
if ((np->specfl & (SP_REFL|SP_RBLT)) != SP_REFL && |
383 |
|
(np->specfl & (SP_TRAN|SP_TBLT)) != SP_TRAN) |
384 |
|
return; |
385 |
|
/* set up sample coordinates */ |
386 |
< |
v[0] = v[1] = v[2] = 0.0; |
385 |
< |
for (i = 0; i < 3; i++) |
386 |
< |
if (np->pnorm[i] < 0.6 && np->pnorm[i] > -0.6) |
387 |
< |
break; |
388 |
< |
v[i] = 1.0; |
389 |
< |
fcross(u, v, np->pnorm); |
390 |
< |
normalize(u); |
386 |
> |
getperpendicular(u, np->pnorm, rand_samp); |
387 |
|
fcross(v, np->pnorm, u); |
388 |
|
/* compute reflection */ |
389 |
|
if ((np->specfl & (SP_REFL|SP_RBLT)) == SP_REFL && |
390 |
< |
rayorigin(&sr, SPECULAR, r, np->scolor) == 0) { |
390 |
> |
rayorigin(&sr, SPECULAR, np->rp, np->scolor) == 0) { |
391 |
|
nstarget = 1; |
392 |
|
if (specjitter > 1.5) { /* multiple samples? */ |
393 |
< |
nstarget = specjitter*r->rweight + .5; |
393 |
> |
nstarget = specjitter*np->rp->rweight + .5; |
394 |
|
if (sr.rweight <= minweight*nstarget) |
395 |
|
nstarget = sr.rweight/minweight; |
396 |
|
if (nstarget > 1) { |
421 |
|
d = sqrt( np->alpha2 * -log(rv[1]) ); |
422 |
|
for (i = 0; i < 3; i++) |
423 |
|
h[i] = np->pnorm[i] + d*(cosp*u[i] + sinp*v[i]); |
424 |
< |
d = -2.0 * DOT(h, r->rdir) / (1.0 + d*d); |
425 |
< |
VSUM(sr.rdir, r->rdir, h, d); |
424 |
> |
d = -2.0 * DOT(h, np->rp->rdir) / (1.0 + d*d); |
425 |
> |
VSUM(sr.rdir, np->rp->rdir, h, d); |
426 |
|
/* sample rejection test */ |
427 |
< |
if ((d = DOT(sr.rdir, r->ron)) <= FTINY) |
427 |
> |
if ((d = DOT(sr.rdir, np->rp->ron)) <= FTINY) |
428 |
|
continue; |
429 |
|
checknorm(sr.rdir); |
430 |
|
if (nstarget > 1) { /* W-G-M-D adjustment */ |
431 |
|
if (nstaken) rayclear(&sr); |
432 |
|
rayvalue(&sr); |
433 |
< |
d = 2./(1. + r->rod/d); |
433 |
> |
d = 2./(1. + np->rp->rod/d); |
434 |
|
scalecolor(sr.rcol, d); |
435 |
|
addcolor(scol, sr.rcol); |
436 |
|
} else { |
437 |
|
rayvalue(&sr); |
438 |
|
multcolor(sr.rcol, sr.rcoef); |
439 |
< |
addcolor(r->rcol, sr.rcol); |
439 |
> |
addcolor(np->rp->rcol, sr.rcol); |
440 |
|
} |
441 |
|
++nstaken; |
442 |
|
} |
444 |
|
multcolor(scol, sr.rcoef); |
445 |
|
d = (double)nstarget/ntrials; |
446 |
|
scalecolor(scol, d); |
447 |
< |
addcolor(r->rcol, scol); |
447 |
> |
addcolor(np->rp->rcol, scol); |
448 |
|
} |
449 |
|
ndims--; |
450 |
|
} |
452 |
|
copycolor(sr.rcoef, np->mcolor); /* modified by color */ |
453 |
|
scalecolor(sr.rcoef, np->tspec); |
454 |
|
if ((np->specfl & (SP_TRAN|SP_TBLT)) == SP_TRAN && |
455 |
< |
rayorigin(&sr, SPECULAR, r, sr.rcoef) == 0) { |
455 |
> |
rayorigin(&sr, SPECULAR, np->rp, sr.rcoef) == 0) { |
456 |
|
nstarget = 1; |
457 |
|
if (specjitter > 1.5) { /* multiple samples? */ |
458 |
< |
nstarget = specjitter*r->rweight + .5; |
458 |
> |
nstarget = specjitter*np->rp->rweight + .5; |
459 |
|
if (sr.rweight <= minweight*nstarget) |
460 |
|
nstarget = sr.rweight/minweight; |
461 |
|
if (nstarget > 1) { |
486 |
|
for (i = 0; i < 3; i++) |
487 |
|
sr.rdir[i] = np->prdir[i] + d*(cosp*u[i] + sinp*v[i]); |
488 |
|
/* sample rejection test */ |
489 |
< |
if (DOT(sr.rdir, r->ron) >= -FTINY) |
489 |
> |
if (DOT(sr.rdir, np->rp->ron) >= -FTINY) |
490 |
|
continue; |
491 |
|
normalize(sr.rdir); /* OK, normalize */ |
492 |
|
if (nstaken) /* multi-sampling */ |
493 |
|
rayclear(&sr); |
494 |
|
rayvalue(&sr); |
495 |
|
multcolor(sr.rcol, sr.rcoef); |
496 |
< |
addcolor(r->rcol, sr.rcol); |
496 |
> |
addcolor(np->rp->rcol, sr.rcol); |
497 |
|
++nstaken; |
498 |
|
} |
499 |
|
ndims--; |