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/* Copyright (c) 1992 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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|
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/* |
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* normal.c - shading function for normal materials. |
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* |
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* Later changes described in delta comments. |
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*/ |
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|
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#include "ray.h" |
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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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|
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extern double specthresh; /* specular sampling threshold */ |
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extern double specjitter; /* specular sampling jitter */ |
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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(-5.85*(ci)) - 0.00287989916) |
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|
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static gaussamp(); |
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|
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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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|
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static srcdirf_t dirnorm; |
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static void gaussamp(RAY *r, NORMDAT *np); |
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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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|
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static void |
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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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FVECT vtmp; |
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COLOR ctmp; |
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if (ldot < 0.0 ? np->trans <= FTINY : np->trans >= 1.0-FTINY) |
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return; /* wrong side */ |
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|
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if (ldot > FTINY && np->rdiff > FTINY) { |
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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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|
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if (ldot > FTINY && ldiff > 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 * np->rdiff / PI; |
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dtmp = ldot * omega * ldiff * (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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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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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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dtmp = exp(-d2/dtmp)/(4.*PI * np->pdot * 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 *= omega; |
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scalecolor(ctmp, dtmp); |
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addcolor(cval, ctmp); |
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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 * np->tdiff * (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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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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dtmp = exp((2.*DOT(np->prdir,ldir)-2.)/dtmp) / |
154 |
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(PI*np->pdot*dtmp); |
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/* worth using? */ |
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if (dtmp > FTINY) { |
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copycolor(ctmp, np->mcolor); |
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dtmp *= np->tspec * omega * sqrt(-ldot/np->pdot); |
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dtmp *= np->tspec * 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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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 */ |
168 |
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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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double transtest, transdist; |
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double mirtest, mirdist; |
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int hastexture; |
177 |
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double d; |
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COLOR ctmp; |
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register int i; |
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/* easy shadow test */ |
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|
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if (m->oargs.nfargs != (m->otype == MAT_TRANS ? 7 : 5)) |
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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) { |
188 |
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if (!backvis && m->otype != MAT_TRANS) { |
189 |
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raytrans(r); |
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return(1); |
191 |
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} |
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raytexture(r, m->omod); |
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flipsurface(r); /* reorient if backvis */ |
194 |
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} else |
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raytexture(r, m->omod); |
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nd.mp = m; |
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nd.rp = r; |
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/* get material color */ |
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nd.alpha2 = m->oargs.farg[4]; |
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if ((nd.alpha2 *= nd.alpha2) <= FTINY) |
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nd.specfl |= SP_PURE; |
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/* reorient if necessary */ |
208 |
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if (r->rod < 0.0) |
209 |
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flipsurface(r); |
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/* get modifiers */ |
211 |
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raytexture(r, m->omod); |
212 |
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nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
207 |
> |
|
208 |
> |
if ( (hastexture = (DOT(r->pert,r->pert) > FTINY*FTINY)) ) { |
209 |
> |
nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
210 |
> |
} else { |
211 |
> |
VCOPY(nd.pnorm, r->ron); |
212 |
> |
nd.pdot = r->rod; |
213 |
> |
} |
214 |
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if (r->ro != NULL && isflat(r->ro->otype)) |
215 |
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nd.specfl |= SP_FLAT; |
216 |
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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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transtest = 0; |
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transdist = r->rot; |
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/* get specular component */ |
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if ((nd.rspec = m->oargs.farg[3]) > FTINY) { |
223 |
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nd.specfl |= SP_REFL; |
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/* compute specular color */ |
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if (m->otype == MAT_METAL) |
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copycolor(nd.scolor, nd.mcolor); |
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else |
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setcolor(nd.scolor, 1.0, 1.0, 1.0); |
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scalecolor(nd.scolor, nd.rspec); |
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/* check threshold */ |
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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 */ |
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< |
for (i = 0; i < 3; i++) |
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< |
nd.vrefl[i] = r->rdir[i] + 2.0*nd.pdot*nd.pnorm[i]; |
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< |
if (DOT(nd.vrefl, r->ron) <= FTINY) /* penetration? */ |
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< |
for (i = 0; i < 3; i++) /* safety measure */ |
204 |
< |
nd.vrefl[i] = r->rdir[i] + 2.*r->rod*r->ron[i]; |
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|
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< |
if (!(r->crtype & SHADOW) && nd.specfl & SP_PURE) { |
207 |
< |
RAY lr; |
208 |
< |
if (rayorigin(&lr, r, REFLECTED, nd.rspec) == 0) { |
209 |
< |
VCOPY(lr.rdir, nd.vrefl); |
210 |
< |
rayvalue(&lr); |
211 |
< |
multcolor(lr.rcol, nd.scolor); |
212 |
< |
addcolor(r->rcol, lr.rcol); |
213 |
< |
} |
214 |
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} |
215 |
< |
} |
219 |
> |
mirtest = transtest = 0; |
220 |
> |
mirdist = transdist = r->rot; |
221 |
> |
nd.rspec = m->oargs.farg[3]; |
222 |
> |
/* compute Fresnel approx. */ |
223 |
> |
if (nd.specfl & SP_PURE && nd.rspec > FTINY) { |
224 |
> |
fest = FRESNE(r->rod); |
225 |
> |
nd.rspec += fest*(1. - nd.rspec); |
226 |
> |
} else |
227 |
> |
fest = 0.; |
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/* compute transmission */ |
229 |
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if (m->otype == MAT_TRANS) { |
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nd.trans = m->oargs.farg[5]*(1.0 - nd.rspec); |
236 |
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if (!(nd.specfl & SP_PURE) && |
237 |
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specthresh >= nd.tspec-FTINY) |
238 |
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nd.specfl |= SP_TBLT; |
239 |
< |
if (r->crtype & SHADOW || |
228 |
< |
DOT(r->pert,r->pert) <= FTINY*FTINY) { |
239 |
> |
if (!hastexture || r->crtype & SHADOW) { |
240 |
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VCOPY(nd.prdir, r->rdir); |
241 |
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transtest = 2; |
242 |
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} else { |
251 |
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} else |
252 |
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nd.tdiff = nd.tspec = nd.trans = 0.0; |
253 |
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/* transmitted ray */ |
254 |
< |
if ((nd.specfl&(SP_TRAN|SP_PURE)) == (SP_TRAN|SP_PURE)) { |
254 |
> |
if ((nd.specfl&(SP_TRAN|SP_PURE|SP_TBLT)) == (SP_TRAN|SP_PURE)) { |
255 |
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RAY lr; |
256 |
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if (rayorigin(&lr, r, TRANS, nd.tspec) == 0) { |
257 |
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VCOPY(lr.rdir, nd.prdir); |
265 |
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} else |
266 |
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transtest = 0; |
267 |
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|
268 |
< |
if (r->crtype & SHADOW) /* the rest is shadow */ |
268 |
> |
if (r->crtype & SHADOW) { /* the rest is shadow */ |
269 |
> |
r->rt = transdist; |
270 |
|
return(1); |
271 |
+ |
} |
272 |
+ |
/* get specular reflection */ |
273 |
+ |
if (nd.rspec > FTINY) { |
274 |
+ |
nd.specfl |= SP_REFL; |
275 |
+ |
/* compute specular color */ |
276 |
+ |
if (m->otype != MAT_METAL) { |
277 |
+ |
setcolor(nd.scolor, nd.rspec, nd.rspec, nd.rspec); |
278 |
+ |
} else if (fest > FTINY) { |
279 |
+ |
d = nd.rspec*(1. - fest); |
280 |
+ |
for (i = 0; i < 3; i++) |
281 |
+ |
nd.scolor[i] = fest + nd.mcolor[i]*d; |
282 |
+ |
} else { |
283 |
+ |
copycolor(nd.scolor, nd.mcolor); |
284 |
+ |
scalecolor(nd.scolor, nd.rspec); |
285 |
+ |
} |
286 |
+ |
/* check threshold */ |
287 |
+ |
if (!(nd.specfl & SP_PURE) && specthresh >= nd.rspec-FTINY) |
288 |
+ |
nd.specfl |= SP_RBLT; |
289 |
+ |
/* compute reflected ray */ |
290 |
+ |
for (i = 0; i < 3; i++) |
291 |
+ |
nd.vrefl[i] = r->rdir[i] + 2.*nd.pdot*nd.pnorm[i]; |
292 |
+ |
/* penetration? */ |
293 |
+ |
if (hastexture && DOT(nd.vrefl, r->ron) <= FTINY) |
294 |
+ |
for (i = 0; i < 3; i++) /* safety measure */ |
295 |
+ |
nd.vrefl[i] = r->rdir[i] + 2.*r->rod*r->ron[i]; |
296 |
+ |
} |
297 |
+ |
/* reflected ray */ |
298 |
+ |
if ((nd.specfl&(SP_REFL|SP_PURE|SP_RBLT)) == (SP_REFL|SP_PURE)) { |
299 |
+ |
RAY lr; |
300 |
+ |
if (rayorigin(&lr, r, REFLECTED, nd.rspec) == 0) { |
301 |
+ |
VCOPY(lr.rdir, nd.vrefl); |
302 |
+ |
rayvalue(&lr); |
303 |
+ |
multcolor(lr.rcol, nd.scolor); |
304 |
+ |
addcolor(r->rcol, lr.rcol); |
305 |
+ |
if (!hastexture && nd.specfl & SP_FLAT) { |
306 |
+ |
mirtest = 2.*bright(lr.rcol); |
307 |
+ |
mirdist = r->rot + lr.rt; |
308 |
+ |
} |
309 |
+ |
} |
310 |
+ |
} |
311 |
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/* diffuse reflection */ |
312 |
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nd.rdiff = 1.0 - nd.trans - nd.rspec; |
313 |
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|
314 |
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if (nd.specfl & SP_PURE && nd.rdiff <= FTINY && nd.tdiff <= FTINY) |
315 |
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return(1); /* 100% pure specular */ |
316 |
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|
317 |
< |
if (r->ro != NULL && (r->ro->otype == OBJ_FACE || |
318 |
< |
r->ro->otype == OBJ_RING)) |
267 |
< |
nd.specfl |= SP_FLAT; |
317 |
> |
if (!(nd.specfl & SP_PURE)) |
318 |
> |
gaussamp(r, &nd); /* checks *BLT flags */ |
319 |
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|
269 |
– |
if (nd.specfl & (SP_REFL|SP_TRAN) && !(nd.specfl & SP_PURE)) |
270 |
– |
gaussamp(r, &nd); |
271 |
– |
|
320 |
|
if (nd.rdiff > FTINY) { /* ambient from this side */ |
321 |
< |
ambient(ctmp, r); |
321 |
> |
ambient(ctmp, r, hastexture?nd.pnorm:r->ron); |
322 |
|
if (nd.specfl & SP_RBLT) |
323 |
|
scalecolor(ctmp, 1.0-nd.trans); |
324 |
|
else |
328 |
|
} |
329 |
|
if (nd.tdiff > FTINY) { /* ambient from other side */ |
330 |
|
flipsurface(r); |
331 |
< |
ambient(ctmp, r); |
331 |
> |
if (hastexture) { |
332 |
> |
FVECT bnorm; |
333 |
> |
bnorm[0] = -nd.pnorm[0]; |
334 |
> |
bnorm[1] = -nd.pnorm[1]; |
335 |
> |
bnorm[2] = -nd.pnorm[2]; |
336 |
> |
ambient(ctmp, r, bnorm); |
337 |
> |
} else |
338 |
> |
ambient(ctmp, r, r->ron); |
339 |
|
if (nd.specfl & SP_TBLT) |
340 |
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scalecolor(ctmp, nd.trans); |
341 |
|
else |
347 |
|
/* add direct component */ |
348 |
|
direct(r, dirnorm, &nd); |
349 |
|
/* check distance */ |
350 |
< |
if (transtest > bright(r->rcol)) |
350 |
> |
d = bright(r->rcol); |
351 |
> |
if (transtest > d) |
352 |
|
r->rt = transdist; |
353 |
+ |
else if (mirtest > d) |
354 |
+ |
r->rt = mirdist; |
355 |
|
|
356 |
|
return(1); |
357 |
|
} |
358 |
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|
359 |
|
|
360 |
< |
static |
361 |
< |
gaussamp(r, np) /* sample gaussian specular */ |
362 |
< |
RAY *r; |
363 |
< |
register NORMDAT *np; |
360 |
> |
static void |
361 |
> |
gaussamp( /* sample gaussian specular */ |
362 |
> |
RAY *r, |
363 |
> |
register NORMDAT *np |
364 |
> |
) |
365 |
|
{ |
366 |
|
RAY sr; |
367 |
|
FVECT u, v, h; |
368 |
|
double rv[2]; |
369 |
|
double d, sinp, cosp; |
370 |
+ |
int niter; |
371 |
|
register int i; |
372 |
|
/* quick test */ |
373 |
|
if ((np->specfl & (SP_REFL|SP_RBLT)) != SP_REFL && |
386 |
|
if ((np->specfl & (SP_REFL|SP_RBLT)) == SP_REFL && |
387 |
|
rayorigin(&sr, r, SPECULAR, np->rspec) == 0) { |
388 |
|
dimlist[ndims++] = (int)np->mp; |
389 |
< |
d = urand(ilhash(dimlist,ndims)+samplendx); |
390 |
< |
multisamp(rv, 2, d); |
391 |
< |
d = 2.0*PI * rv[0]; |
392 |
< |
cosp = cos(d); |
393 |
< |
sinp = sin(d); |
394 |
< |
rv[1] = 1.0 - specjitter*rv[1]; |
395 |
< |
if (rv[1] <= FTINY) |
396 |
< |
d = 1.0; |
397 |
< |
else |
398 |
< |
d = sqrt( np->alpha2 * -log(rv[1]) ); |
399 |
< |
for (i = 0; i < 3; i++) |
400 |
< |
h[i] = np->pnorm[i] + d*(cosp*u[i] + sinp*v[i]); |
401 |
< |
d = -2.0 * DOT(h, r->rdir) / (1.0 + d*d); |
402 |
< |
for (i = 0; i < 3; i++) |
403 |
< |
sr.rdir[i] = r->rdir[i] + d*h[i]; |
404 |
< |
if (DOT(sr.rdir, r->ron) <= FTINY) |
405 |
< |
VCOPY(sr.rdir, np->vrefl); /* jitter no good */ |
406 |
< |
rayvalue(&sr); |
407 |
< |
multcolor(sr.rcol, np->scolor); |
408 |
< |
addcolor(r->rcol, sr.rcol); |
389 |
> |
for (niter = 0; niter < MAXITER; niter++) { |
390 |
> |
if (niter) |
391 |
> |
d = frandom(); |
392 |
> |
else |
393 |
> |
d = urand(ilhash(dimlist,ndims)+samplendx); |
394 |
> |
multisamp(rv, 2, d); |
395 |
> |
d = 2.0*PI * rv[0]; |
396 |
> |
cosp = tcos(d); |
397 |
> |
sinp = tsin(d); |
398 |
> |
rv[1] = 1.0 - specjitter*rv[1]; |
399 |
> |
if (rv[1] <= FTINY) |
400 |
> |
d = 1.0; |
401 |
> |
else |
402 |
> |
d = sqrt( np->alpha2 * -log(rv[1]) ); |
403 |
> |
for (i = 0; i < 3; i++) |
404 |
> |
h[i] = np->pnorm[i] + d*(cosp*u[i] + sinp*v[i]); |
405 |
> |
d = -2.0 * DOT(h, r->rdir) / (1.0 + d*d); |
406 |
> |
for (i = 0; i < 3; i++) |
407 |
> |
sr.rdir[i] = r->rdir[i] + d*h[i]; |
408 |
> |
if (DOT(sr.rdir, r->ron) > FTINY) { |
409 |
> |
rayvalue(&sr); |
410 |
> |
multcolor(sr.rcol, np->scolor); |
411 |
> |
addcolor(r->rcol, sr.rcol); |
412 |
> |
break; |
413 |
> |
} |
414 |
> |
} |
415 |
|
ndims--; |
416 |
|
} |
417 |
|
/* compute transmission */ |
418 |
|
if ((np->specfl & (SP_TRAN|SP_TBLT)) == SP_TRAN && |
419 |
|
rayorigin(&sr, r, SPECULAR, np->tspec) == 0) { |
420 |
|
dimlist[ndims++] = (int)np->mp; |
421 |
< |
d = urand(ilhash(dimlist,ndims)+1823+samplendx); |
422 |
< |
multisamp(rv, 2, d); |
423 |
< |
d = 2.0*PI * rv[0]; |
424 |
< |
cosp = cos(d); |
425 |
< |
sinp = sin(d); |
426 |
< |
rv[1] = 1.0 - specjitter*rv[1]; |
427 |
< |
if (rv[1] <= FTINY) |
428 |
< |
d = 1.0; |
429 |
< |
else |
430 |
< |
d = sqrt( -log(rv[1]) * np->alpha2 ); |
431 |
< |
for (i = 0; i < 3; i++) |
432 |
< |
sr.rdir[i] = np->prdir[i] + d*(cosp*u[i] + sinp*v[i]); |
433 |
< |
if (DOT(sr.rdir, r->ron) < -FTINY) |
434 |
< |
normalize(sr.rdir); /* OK, normalize */ |
435 |
< |
else |
436 |
< |
VCOPY(sr.rdir, np->prdir); /* else no jitter */ |
437 |
< |
rayvalue(&sr); |
438 |
< |
scalecolor(sr.rcol, np->tspec); |
439 |
< |
multcolor(sr.rcol, np->mcolor); /* modified by color */ |
440 |
< |
addcolor(r->rcol, sr.rcol); |
421 |
> |
for (niter = 0; niter < MAXITER; niter++) { |
422 |
> |
if (niter) |
423 |
> |
d = frandom(); |
424 |
> |
else |
425 |
> |
d = urand(ilhash(dimlist,ndims)+1823+samplendx); |
426 |
> |
multisamp(rv, 2, d); |
427 |
> |
d = 2.0*PI * rv[0]; |
428 |
> |
cosp = tcos(d); |
429 |
> |
sinp = tsin(d); |
430 |
> |
rv[1] = 1.0 - specjitter*rv[1]; |
431 |
> |
if (rv[1] <= FTINY) |
432 |
> |
d = 1.0; |
433 |
> |
else |
434 |
> |
d = sqrt( np->alpha2 * -log(rv[1]) ); |
435 |
> |
for (i = 0; i < 3; i++) |
436 |
> |
sr.rdir[i] = np->prdir[i] + d*(cosp*u[i] + sinp*v[i]); |
437 |
> |
if (DOT(sr.rdir, r->ron) < -FTINY) { |
438 |
> |
normalize(sr.rdir); /* OK, normalize */ |
439 |
> |
rayvalue(&sr); |
440 |
> |
scalecolor(sr.rcol, np->tspec); |
441 |
> |
multcolor(sr.rcol, np->mcolor); /* modified */ |
442 |
> |
addcolor(r->rcol, sr.rcol); |
443 |
> |
break; |
444 |
> |
} |
445 |
> |
} |
446 |
|
ndims--; |
447 |
|
} |
448 |
|
} |