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#include "copyright.h" |
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#include "ray.h" |
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#include "ambient.h" |
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#include "source.h" |
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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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#ifndef MAXITER |
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#define MAXITER 10 /* maximum # specular ray attempts */ |
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#endif |
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/* estimate of Fresnel function */ |
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#define FRESNE(ci) (exp(-6.0*(ci)) - 0.00247875217) |
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#define FRESNE(ci) (exp(-5.85*(ci)) - 0.00287989916) |
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#define FRESTHRESH 0.017999 /* minimum specularity for approx. */ |
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static void gaussamp(); |
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/* |
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* This routine implements the isotropic Gaussian |
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double pdot; /* perturbed dot product */ |
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} NORMDAT; /* normal material data */ |
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static srcdirf_t dirnorm; |
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static void gaussamp(RAY *r, NORMDAT *np); |
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static void |
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dirnorm(cval, np, ldir, omega) /* compute source contribution */ |
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COLOR cval; /* returned coefficient */ |
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register NORMDAT *np; /* material data */ |
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FVECT ldir; /* light source direction */ |
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double omega; /* light source size */ |
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dirnorm( /* compute source contribution */ |
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COLOR cval, /* returned coefficient */ |
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void *nnp, /* material data */ |
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FVECT ldir, /* light source direction */ |
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double omega /* light source size */ |
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) |
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{ |
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register NORMDAT *np = nnp; |
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double ldot; |
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double ldiff; |
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double dtmp, d2; |
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> |
double lrdiff, ltdiff; |
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double dtmp, d2, d3, d4; |
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FVECT vtmp; |
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COLOR ctmp; |
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return; /* wrong side */ |
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/* Fresnel estimate */ |
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ldiff = np->rdiff; |
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if (np->specfl & SP_PURE && (np->rspec > FTINY & ldiff > FTINY)) |
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< |
ldiff *= 1. - FRESNE(fabs(ldot)); |
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lrdiff = np->rdiff; |
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ltdiff = np->tdiff; |
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if (np->specfl & SP_PURE && np->rspec >= FRESTHRESH && |
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(lrdiff > FTINY) | (ltdiff > FTINY)) { |
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dtmp = 1. - FRESNE(fabs(ldot)); |
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lrdiff *= dtmp; |
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ltdiff *= dtmp; |
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} |
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if (ldot > FTINY && ldiff > FTINY) { |
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if (ldot > FTINY && lrdiff > FTINY) { |
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/* |
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* Compute and add diffuse reflected component to returned |
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* color. The diffuse reflected component will always be |
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* modified by the color of the material. |
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*/ |
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copycolor(ctmp, np->mcolor); |
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dtmp = ldot * omega * ldiff / PI; |
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dtmp = ldot * omega * lrdiff * (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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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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* gaussian distribution model. |
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* Gaussian distribution model. |
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*/ |
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/* roughness */ |
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dtmp = np->alpha2; |
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/* + source if flat */ |
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if (np->specfl & SP_FLAT) |
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dtmp += omega/(4.0*PI); |
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dtmp += omega * (0.25/PI); |
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/* half vector */ |
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vtmp[0] = ldir[0] - np->rp->rdir[0]; |
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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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d2 = DOT(vtmp, np->pnorm); |
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d2 *= d2; |
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d2 = (DOT(vtmp,vtmp) - d2) / d2; |
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/* gaussian */ |
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dtmp = exp(-d2/dtmp)/(4.*PI*dtmp); |
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d3 = DOT(vtmp,vtmp); |
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d4 = (d3 - d2) / d2; |
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/* new W-G-M-D model */ |
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dtmp = exp(-d4/dtmp) * d3 / (PI * d2*d2 * dtmp); |
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/* worth using? */ |
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if (dtmp > FTINY) { |
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copycolor(ctmp, np->scolor); |
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dtmp *= omega * sqrt(ldot/np->pdot); |
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dtmp *= ldot * omega; |
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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 && np->tdiff > FTINY) { |
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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 * np->tdiff / PI; |
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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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* is always modified by material color. |
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*/ |
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/* roughness + source */ |
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dtmp = np->alpha2 + omega/PI; |
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/* gaussian */ |
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dtmp = np->alpha2 + omega*(1.0/PI); |
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/* Gaussian */ |
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dtmp = exp((2.*DOT(np->prdir,ldir)-2.)/dtmp)/(PI*dtmp); |
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/* worth using? */ |
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if (dtmp > FTINY) { |
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} |
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int |
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m_normal(m, r) /* color a ray that hit something normal */ |
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register OBJREC *m; |
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register RAY *r; |
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extern int |
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m_normal( /* color a ray that hit something normal */ |
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register OBJREC *m, |
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register RAY *r |
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) |
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{ |
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NORMDAT nd; |
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double fest; |
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if ((nd.alpha2 *= nd.alpha2) <= FTINY) |
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nd.specfl |= SP_PURE; |
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if (hastexture = (DOT(r->pert,r->pert) > FTINY*FTINY)) { |
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if ( (hastexture = (DOT(r->pert,r->pert) > FTINY*FTINY)) ) { |
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nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
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} else { |
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VCOPY(nd.pnorm, r->ron); |
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nd.pdot = r->rod; |
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if (r->ro != NULL && isflat(r->ro->otype)) |
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nd.specfl |= SP_FLAT; |
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} |
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if (r->ro != NULL && isflat(r->ro->otype)) |
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nd.specfl |= SP_FLAT; |
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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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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 > FTINY) { |
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> |
if (nd.specfl & SP_PURE && nd.rspec >= FRESTHRESH) { |
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fest = FRESNE(r->rod); |
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nd.rspec += fest*(1. - nd.rspec); |
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} else |
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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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< |
if (rayorigin(&lr, r, TRANS, nd.tspec) == 0) { |
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> |
copycolor(lr.rcoef, nd.mcolor); /* modified by color */ |
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> |
scalecolor(lr.rcoef, nd.tspec); |
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> |
if (rayorigin(&lr, TRANS, r, lr.rcoef) == 0) { |
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VCOPY(lr.rdir, nd.prdir); |
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rayvalue(&lr); |
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scalecolor(lr.rcol, nd.tspec); |
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multcolor(lr.rcol, nd.mcolor); /* modified by color */ |
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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; |
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if (hastexture && DOT(nd.vrefl, r->ron) <= FTINY) |
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for (i = 0; i < 3; i++) /* safety measure */ |
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nd.vrefl[i] = r->rdir[i] + 2.*r->rod*r->ron[i]; |
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checknorm(nd.vrefl); |
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} |
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/* reflected ray */ |
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if ((nd.specfl&(SP_REFL|SP_PURE|SP_RBLT)) == (SP_REFL|SP_PURE)) { |
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RAY lr; |
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< |
if (rayorigin(&lr, r, REFLECTED, nd.rspec) == 0) { |
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> |
if (rayorigin(&lr, REFLECTED, r, nd.scolor) == 0) { |
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VCOPY(lr.rdir, nd.vrefl); |
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rayvalue(&lr); |
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< |
multcolor(lr.rcol, nd.scolor); |
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> |
multcolor(lr.rcol, lr.rcoef); |
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addcolor(r->rcol, lr.rcol); |
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if (!hastexture && nd.specfl & SP_FLAT) { |
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mirtest = 2.*bright(lr.rcol); |
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gaussamp(r, &nd); /* checks *BLT flags */ |
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if (nd.rdiff > FTINY) { /* ambient from this side */ |
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< |
ambient(ctmp, r, hastexture?nd.pnorm:r->ron); |
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> |
copycolor(ctmp, nd.mcolor); /* modified by material color */ |
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if (nd.specfl & SP_RBLT) |
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scalecolor(ctmp, 1.0-nd.trans); |
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else |
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scalecolor(ctmp, nd.rdiff); |
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< |
multcolor(ctmp, nd.mcolor); /* modified by material color */ |
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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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} |
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if (nd.tdiff > FTINY) { /* ambient from other side */ |
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+ |
copycolor(ctmp, nd.mcolor); /* modified by color */ |
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+ |
if (nd.specfl & SP_TBLT) |
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+ |
scalecolor(ctmp, nd.trans); |
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else |
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+ |
scalecolor(ctmp, nd.tdiff); |
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flipsurface(r); |
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if (hastexture) { |
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FVECT bnorm; |
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bnorm[0] = -nd.pnorm[0]; |
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bnorm[1] = -nd.pnorm[1]; |
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bnorm[2] = -nd.pnorm[2]; |
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< |
ambient(ctmp, r, bnorm); |
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> |
multambient(ctmp, r, bnorm); |
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} else |
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< |
ambient(ctmp, r, r->ron); |
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< |
if (nd.specfl & SP_TBLT) |
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< |
scalecolor(ctmp, nd.trans); |
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< |
else |
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< |
scalecolor(ctmp, nd.tdiff); |
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< |
multcolor(ctmp, nd.mcolor); /* modified by color */ |
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> |
multambient(ctmp, r, r->ron); |
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addcolor(r->rcol, ctmp); |
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flipsurface(r); |
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} |
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static void |
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< |
gaussamp(r, np) /* sample gaussian specular */ |
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< |
RAY *r; |
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< |
register NORMDAT *np; |
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> |
gaussamp( /* sample Gaussian specular */ |
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> |
RAY *r, |
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> |
register NORMDAT *np |
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> |
) |
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{ |
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RAY sr; |
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FVECT u, v, h; |
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fcross(v, np->pnorm, u); |
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/* compute reflection */ |
| 394 |
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if ((np->specfl & (SP_REFL|SP_RBLT)) == SP_REFL && |
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< |
rayorigin(&sr, r, SPECULAR, np->rspec) == 0) { |
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> |
rayorigin(&sr, SPECULAR, r, np->scolor) == 0) { |
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dimlist[ndims++] = (int)np->mp; |
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for (niter = 0; niter < MAXITER; niter++) { |
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if (niter) |
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sr.rdir[i] = r->rdir[i] + d*h[i]; |
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if (DOT(sr.rdir, r->ron) > FTINY) { |
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rayvalue(&sr); |
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< |
multcolor(sr.rcol, np->scolor); |
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> |
multcolor(sr.rcol, sr.rcoef); |
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addcolor(r->rcol, sr.rcol); |
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break; |
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} |
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ndims--; |
| 424 |
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} |
| 425 |
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/* compute transmission */ |
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+ |
copycolor(sr.rcoef, np->mcolor); /* modified by color */ |
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+ |
scalecolor(sr.rcoef, np->tspec); |
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if ((np->specfl & (SP_TRAN|SP_TBLT)) == SP_TRAN && |
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< |
rayorigin(&sr, r, SPECULAR, np->tspec) == 0) { |
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> |
rayorigin(&sr, SPECULAR, r, sr.rcoef) == 0) { |
| 430 |
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dimlist[ndims++] = (int)np->mp; |
| 431 |
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for (niter = 0; niter < MAXITER; niter++) { |
| 432 |
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if (niter) |
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if (DOT(sr.rdir, r->ron) < -FTINY) { |
| 448 |
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normalize(sr.rdir); /* OK, normalize */ |
| 449 |
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rayvalue(&sr); |
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< |
scalecolor(sr.rcol, np->tspec); |
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< |
multcolor(sr.rcol, np->mcolor); /* modified */ |
| 450 |
> |
multcolor(sr.rcol, sr.rcoef); |
| 451 |
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addcolor(r->rcol, sr.rcol); |
| 452 |
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break; |
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} |
