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#include "otypes.h" |
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#include "rtotypes.h" |
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#include "random.h" |
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#include "pmapmat.h" |
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|
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#ifndef MAXITER |
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#define MAXITER 10 /* maximum # specular ray attempts */ |
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scalecolor(ctmp, dtmp); |
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addcolor(cval, ctmp); |
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} |
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|
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if (ldot < -FTINY && ltdiff > FTINY) { |
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/* |
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* Compute diffuse transmission. |
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*/ |
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copycolor(ctmp, np->mcolor); |
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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); |
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} |
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|
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if (ambRayInPmap(np->rp)) |
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return; /* specular already in photon map */ |
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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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addcolor(cval, ctmp); |
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} |
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} |
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if (ldot < -FTINY && ltdiff > FTINY) { |
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/* |
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* Compute diffuse transmission. |
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*/ |
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copycolor(ctmp, np->mcolor); |
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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); |
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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 |
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{ |
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NORMDAT nd; |
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double fest; |
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double transtest, transdist; |
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double mirtest, mirdist; |
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int hastexture; |
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double d; |
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COLOR ctmp; |
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int i; |
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|
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/* PMAP: skip transmitted shadow ray if accounted for in photon map */ |
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/* No longer needed? |
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if (shadowRayInPmap(r) || ambRayInPmap(r)) |
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return(1); */ |
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|
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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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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 */ |
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mirtest = transtest = 0; |
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mirdist = transdist = r->rot; |
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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) { |
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nd.specfl |= SP_TBLT; |
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if (!hastexture || r->crtype & (SHADOW|AMBIENT)) { |
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VCOPY(nd.prdir, r->rdir); |
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transtest = 2; |
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} else { |
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for (i = 0; i < 3; i++) /* perturb */ |
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nd.prdir[i] = r->rdir[i] - r->pert[i]; |
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/* perturb */ |
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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; |
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/* diffuse reflection */ |
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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); |
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transtest *= bright(lr.rcol); |
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transdist = r->rot + lr.rt; |
277 |
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if (nd.tspec >= 1.0-FTINY) { |
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/* completely transparent */ |
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> |
multcolor(lr.mcol, lr.rcoef); |
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copycolor(r->mcol, lr.mcol); |
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r->rmt = r->rot + lr.rmt; |
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r->rxt = r->rot + lr.rxt; |
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} else if (nd.tspec > nd.tdiff + nd.rdiff) |
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r->rxt = r->rot + raydistance(&lr); |
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} |
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} else |
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transtest = 0; |
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} |
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|
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if (r->crtype & SHADOW) { /* the rest is shadow */ |
273 |
< |
r->rt = transdist; |
288 |
> |
if (r->crtype & SHADOW) /* the rest is shadow */ |
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return(1); |
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} |
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/* get specular reflection */ |
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if (nd.rspec > FTINY) { |
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nd.specfl |= SP_REFL; |
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VCOPY(lr.rdir, nd.vrefl); |
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rayvalue(&lr); |
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multcolor(lr.rcol, lr.rcoef); |
322 |
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copycolor(r->mcol, lr.rcol); |
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addcolor(r->rcol, lr.rcol); |
324 |
+ |
r->rmt = r->rot; |
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if (nd.specfl & SP_FLAT && |
326 |
< |
!hastexture | (r->crtype & AMBIENT)) { |
327 |
< |
mirtest = 2.*bright(lr.rcol); |
312 |
< |
mirdist = r->rot + lr.rt; |
313 |
< |
} |
326 |
> |
!hastexture | (r->crtype & AMBIENT)) |
327 |
> |
r->rmt += raydistance(&lr); |
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} |
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} |
316 |
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/* diffuse reflection */ |
317 |
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nd.rdiff = 1.0 - nd.trans - nd.rspec; |
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|
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if (nd.specfl & SP_PURE && nd.rdiff <= FTINY && nd.tdiff <= FTINY) |
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return(1); /* 100% pure specular */ |
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|
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if (!(nd.specfl & SP_PURE)) |
335 |
< |
gaussamp(&nd); /* checks *BLT flags */ |
335 |
> |
gaussamp(&nd); /* checks *BLT flags */ |
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|
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if (nd.rdiff > FTINY) { /* ambient from this side */ |
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copycolor(ctmp, nd.mcolor); /* modified by material color */ |
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} |
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/* add direct component */ |
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direct(r, dirnorm, &nd); |
353 |
– |
/* check distance */ |
354 |
– |
d = bright(r->rcol); |
355 |
– |
if (transtest > d) |
356 |
– |
r->rt = transdist; |
357 |
– |
else if (mirtest > d) |
358 |
– |
r->rt = mirdist; |
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|
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return(1); |
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} |
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(np->specfl & (SP_TRAN|SP_TBLT)) != SP_TRAN) |
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return; |
386 |
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/* set up sample coordinates */ |
387 |
< |
v[0] = v[1] = v[2] = 0.0; |
382 |
< |
for (i = 0; i < 3; i++) |
383 |
< |
if (np->pnorm[i] < 0.6 && np->pnorm[i] > -0.6) |
384 |
< |
break; |
385 |
< |
v[i] = 1.0; |
386 |
< |
fcross(u, v, np->pnorm); |
387 |
< |
normalize(u); |
387 |
> |
getperpendicular(u, np->pnorm, rand_samp); |
388 |
|
fcross(v, np->pnorm, u); |
389 |
|
/* compute reflection */ |
390 |
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if ((np->specfl & (SP_REFL|SP_RBLT)) == SP_REFL && |