--- ray/src/rt/m_bsdf.c 2017/07/17 00:14:28 2.40 +++ ray/src/rt/m_bsdf.c 2024/12/13 19:05:03 2.75 @@ -1,5 +1,5 @@ #ifndef lint -static const char RCSid[] = "$Id: m_bsdf.c,v 2.40 2017/07/17 00:14:28 greg Exp $"; +static const char RCSid[] = "$Id: m_bsdf.c,v 2.75 2024/12/13 19:05:03 greg Exp $"; #endif /* * Shading for materials with BSDFs taken from XML data files @@ -8,6 +8,7 @@ static const char RCSid[] = "$Id: m_bsdf.c,v 2.40 2017 #include "copyright.h" #include "ray.h" +#include "otypes.h" #include "ambient.h" #include "source.h" #include "func.h" @@ -18,7 +19,7 @@ static const char RCSid[] = "$Id: m_bsdf.c,v 2.40 2017 /* * Arguments to this material include optional diffuse colors. * String arguments include the BSDF and function files. - * A non-zero thickness causes the strange but useful behavior + * For the MAT_BSDF type, a non-zero thickness causes the useful behavior * of translating transmitted rays this distance beneath the surface * (opposite the surface normal) to bypass any intervening geometry. * Translation only affects scattered, non-source-directed samples. @@ -35,11 +36,13 @@ static const char RCSid[] = "$Id: m_bsdf.c,v 2.40 2017 * hides geometry in front of the surface when rays hit from behind, * and applies only the transmission and backside reflectance properties. * Reflection is ignored on the hidden side, as those rays pass through. - * When thickness is set to zero, shadow rays will be blocked unless - * a BTDF has a strong "through" component in the source direction. + * For the MAT_ABSDF type, we check for a strong "through" component. + * Such a component will cause direct rays to pass through unscattered. * A separate test prevents over-counting by dropping samples that are * too close to this "through" direction. BSDFs with such a through direction * will also have a view component, meaning they are somewhat see-through. + * A MAT_BSDF type with zero thickness behaves the same as a MAT_ABSDF + * type with no strong through component. * The "up" vector for the BSDF is given by three variables, defined * (along with the thickness) by the named function file, or '.' if none. * Together with the surface normal, this defines the local coordinate @@ -52,6 +55,13 @@ static const char RCSid[] = "$Id: m_bsdf.c,v 2.40 2017 * not multiplied. However, patterns affect this material as a multiplier * on everything except non-diffuse reflection. * + * Arguments for MAT_ABSDF are: + * 5+ BSDFfile ux uy uz funcfile transform + * 0 + * 0|3|6|9 rdf gdf bdf + * rdb gdb bdb + * rdt gdt bdt + * * Arguments for MAT_BSDF are: * 6+ thick BSDFfile ux uy uz funcfile transform * 0 @@ -76,46 +86,60 @@ typedef struct { RREAL toloc[3][3]; /* world to local BSDF coords */ RREAL fromloc[3][3]; /* local BSDF coords to world */ double thick; /* surface thickness */ - COLOR cthru; /* "through" component multiplier */ + SCOLOR cthru; /* "through" component for MAT_ABSDF */ + SCOLOR cthru_surr; /* surround for "through" component */ SDData *sd; /* loaded BSDF data */ - COLOR rdiff; /* diffuse reflection */ - COLOR runsamp; /* BSDF hemispherical reflection */ - COLOR tdiff; /* diffuse transmission */ - COLOR tunsamp; /* BSDF hemispherical transmission */ + SCOLOR rdiff; /* diffuse reflection */ + SCOLOR runsamp; /* BSDF hemispherical reflection */ + SCOLOR tdiff; /* diffuse transmission */ + SCOLOR tunsamp; /* BSDF hemispherical transmission */ } BSDFDAT; /* BSDF material data */ -#define cvt_sdcolor(cv, svp) ccy2rgb(&(svp)->spec, (svp)->cieY, cv) +#define cvt_sdcolor(scv, svp) ccy2scolor(&(svp)->spec, (svp)->cieY, scv) -/* Compute "through" component color */ +typedef struct { + double vy; /* brightness (for sorting) */ + FVECT tdir; /* through sample direction (normalized) */ + SCOLOR vcol; /* BTDF color */ +} PEAKSAMP; /* BTDF peak sample */ + +/* Comparison function to put near-peak values in descending order */ +static int +cmp_psamp(const void *p1, const void *p2) +{ + double diff = (*(const PEAKSAMP *)p1).vy - (*(const PEAKSAMP *)p2).vy; + if (diff > 0) return(-1); + if (diff < 0) return(1); + return(0); +} + +/* Compute "through" component color for MAT_ABSDF */ static void compute_through(BSDFDAT *ndp) { -#define NDIR2CHECK 13 +#define NDIR2CHECK 29 static const float dir2check[NDIR2CHECK][2] = { - {0, 0}, - {-0.8, 0}, - {0, 0.8}, - {0, -0.8}, - {0.8, 0}, - {-0.8, 0.8}, - {-0.8, -0.8}, - {0.8, 0.8}, - {0.8, -0.8}, - {-1.6, 0}, - {0, 1.6}, - {0, -1.6}, - {1.6, 0}, + {0, 0}, {-0.6, 0}, {0, 0.6}, + {0, -0.6}, {0.6, 0}, {-0.6, 0.6}, + {-0.6, -0.6}, {0.6, 0.6}, {0.6, -0.6}, + {-1.2, 0}, {0, 1.2}, {0, -1.2}, + {1.2, 0}, {-1.2, 1.2}, {-1.2, -1.2}, + {1.2, 1.2}, {1.2, -1.2}, {-1.8, 0}, + {0, 1.8}, {0, -1.8}, {1.8, 0}, + {-1.8, 1.8}, {-1.8, -1.8}, {1.8, 1.8}, + {1.8, -1.8}, {-2.4, 0}, {0, 2.4}, + {0, -2.4}, {2.4, 0}, }; - const double peak_over = 2.0; + PEAKSAMP psamp[NDIR2CHECK]; SDSpectralDF *dfp; FVECT pdir; double tomega, srchrad; - COLOR vpeak, vsum; - int i; + double tomsum, tomsurr; + SCOLOR vpeak, vsurr, btdiff; + double vypeak; + int i, ns; SDError ec; - setcolor(ndp->cthru, 0, 0, 0); /* starting assumption */ - if (ndp->pr->rod > 0) dfp = (ndp->sd->tf != NULL) ? ndp->sd->tf : ndp->sd->tb; else @@ -123,43 +147,71 @@ compute_through(BSDFDAT *ndp) if (dfp == NULL) return; /* no specular transmission */ - if (bright(ndp->pr->pcol) <= FTINY) + if (sintens(ndp->pr->pcol) <= FTINY) return; /* pattern is black, here */ - srchrad = sqrt(dfp->minProjSA); /* else search for peak */ - setcolor(vpeak, 0, 0, 0); - setcolor(vsum, 0, 0, 0); + srchrad = sqrt(dfp->minProjSA); /* else evaluate peak */ for (i = 0; i < NDIR2CHECK; i++) { - FVECT tdir; SDValue sv; - COLOR vcol; - tdir[0] = -ndp->vray[0] + dir2check[i][0]*srchrad; - tdir[1] = -ndp->vray[1] + dir2check[i][1]*srchrad; - tdir[2] = -ndp->vray[2]; - normalize(tdir); - ec = SDevalBSDF(&sv, tdir, ndp->vray, ndp->sd); + psamp[i].tdir[0] = -ndp->vray[0] + dir2check[i][0]*srchrad; + psamp[i].tdir[1] = -ndp->vray[1] + dir2check[i][1]*srchrad; + psamp[i].tdir[2] = -ndp->vray[2]; + normalize(psamp[i].tdir); + ec = SDevalBSDF(&sv, ndp->vray, psamp[i].tdir, ndp->sd); if (ec) goto baderror; - cvt_sdcolor(vcol, &sv); - addcolor(vsum, vcol); - if (bright(vcol) > bright(vpeak)) { - copycolor(vpeak, vcol); - VCOPY(pdir, tdir); + cvt_sdcolor(psamp[i].vcol, &sv); + psamp[i].vy = sv.cieY; + } + qsort(psamp, NDIR2CHECK, sizeof(PEAKSAMP), cmp_psamp); + if (psamp[0].vy <= FTINY) + return; /* zero BTDF here */ + scolorblack(vpeak); + scolorblack(vsurr); + vypeak = tomsum = tomsurr = 0; /* combine top unique values */ + ns = 0; + for (i = 0; i < NDIR2CHECK; i++) { + if (i && psamp[i].vy == psamp[i-1].vy) + continue; /* assume duplicate sample */ + + ec = SDsizeBSDF(&tomega, ndp->vray, psamp[i].tdir, + SDqueryMin, ndp->sd); + if (ec) + goto baderror; + + scalescolor(psamp[i].vcol, tomega); + /* not part of peak? */ + if (tomega > 1.5*dfp->minProjSA || + vypeak > 8.*psamp[i].vy*ns) { + if (!i) return; /* abort */ + saddscolor(vsurr, psamp[i].vcol); + tomsurr += tomega; + continue; } + saddscolor(vpeak, psamp[i].vcol); + tomsum += tomega; + vypeak += psamp[i].vy; + ++ns; } - ec = SDsizeBSDF(&tomega, pdir, ndp->vray, SDqueryMin, ndp->sd); - if (ec) - goto baderror; - if (tomega > 1.5*dfp->minProjSA) - return; /* not really a peak? */ - if ((bright(vpeak) - ndp->sd->tLamb.cieY*(1./PI))*tomega <= .001) - return; /* < 0.1% transmission */ - for (i = 3; i--; ) /* remove peak from average */ - colval(vsum,i) -= colval(vpeak,i); - if (peak_over*bright(vsum) >= (NDIR2CHECK-1)*bright(vpeak)) - return; /* not peaky enough */ - copycolor(ndp->cthru, vpeak); /* else use it */ - scalecolor(ndp->cthru, tomega); - multcolor(ndp->cthru, ndp->pr->pcol); /* modify by pattern */ + if (tomsurr < 0.2*tomsum) /* insufficient surround? */ + return; + scalescolor(vsurr, 1./tomsurr); /* surround is avg. BTDF */ + if (ndp->vray[2] > 0) /* get diffuse BTDF */ + cvt_sdcolor(btdiff, &ndp->sd->tLambFront); + else + cvt_sdcolor(btdiff, &ndp->sd->tLambBack); + scalescolor(btdiff, (1./PI)); + for (i = NCSAMP; i--; ) { /* remove diffuse contrib. */ + if ((vpeak[i] -= tomsum*btdiff[i]) < 0) + vpeak[i] = 0; + if ((vsurr[i] -= btdiff[i]) < 0) + vsurr[i] = 0; + } + if (pbright(vpeak) < .0005) /* < 0.05% specular? */ + return; + smultscolor(vsurr, ndp->pr->pcol); /* modify by pattern */ + smultscolor(vpeak, ndp->pr->pcol); + copyscolor(ndp->cthru_surr, vsurr); + copyscolor(ndp->cthru, vpeak); return; baderror: objerror(ndp->mp, USER, transSDError(ec)); @@ -182,22 +234,40 @@ bsdf_jitter(FVECT vres, BSDFDAT *ndp, double sr_psa) /* Get BSDF specular for direct component, returning true if OK to proceed */ static int -direct_specular_OK(COLOR cval, FVECT ldir, double omega, BSDFDAT *ndp) +direct_specular_OK(SCOLOR scval, FVECT ldir, double omega, BSDFDAT *ndp) { - int nsamp, ok = 0; - FVECT vsrc, vsmp, vjit; + int nsamp = 1; + int scnt = 0; + FVECT vsrc; double tomega, tomega2; - double sf, tsr, sd[2]; - COLOR csmp, cdiff; + double tsr, sd[2]; + SCOLOR csmp, cdiff; double diffY; SDValue sv; SDError ec; int i; /* in case we fail */ - setcolor(cval, 0, 0, 0); + scolorblack(scval); /* transform source direction */ if (SDmapDir(vsrc, ndp->toloc, ldir) != SDEnone) return(0); + /* check indirect over-counting */ + if ((vsrc[2] > 0) ^ (ndp->vray[2] > 0) && sintens(ndp->cthru) > FTINY) { + double dx = vsrc[0] + ndp->vray[0]; + double dy = vsrc[1] + ndp->vray[1]; + SDSpectralDF *dfp = (ndp->pr->rod > 0) ? + ((ndp->sd->tf != NULL) ? ndp->sd->tf : ndp->sd->tb) : + ((ndp->sd->tb != NULL) ? ndp->sd->tb : ndp->sd->tf) ; + + tomega = omega*fabs(vsrc[2]); + if (dx*dx + dy*dy <= (2.5*4./PI)*(tomega + dfp->minProjSA + + 2.*sqrt(tomega*dfp->minProjSA))) { + if (sintens(ndp->cthru_surr) <= FTINY) + return(0); + copyscolor(scval, ndp->cthru_surr); + return(1); /* return non-zero surround BTDF */ + } + } /* will discount diffuse portion */ switch ((vsrc[2] > 0)<<1 | (ndp->vray[2] > 0)) { case 3: @@ -210,77 +280,61 @@ direct_specular_OK(COLOR cval, FVECT ldir, double omeg return(0); /* all diffuse */ sv = ndp->sd->rLambBack; break; - default: + case 1: if ((ndp->sd->tf == NULL) & (ndp->sd->tb == NULL)) return(0); /* all diffuse */ - sv = ndp->sd->tLamb; + sv = ndp->sd->tLambFront; break; + case 2: + if ((ndp->sd->tf == NULL) & (ndp->sd->tb == NULL)) + return(0); /* all diffuse */ + sv = ndp->sd->tLambBack; + break; } if (sv.cieY > FTINY) { diffY = sv.cieY *= 1./PI; cvt_sdcolor(cdiff, &sv); } else { diffY = 0; - setcolor(cdiff, 0, 0, 0); + scolorblack(cdiff); } - /* need projected solid angles */ - omega *= fabs(vsrc[2]); ec = SDsizeBSDF(&tomega, ndp->vray, vsrc, SDqueryMin, ndp->sd); if (ec) goto baderror; - /* check indirect over-counting */ - if ((vsrc[2] > 0) ^ (ndp->vray[2] > 0) && bright(ndp->cthru) > FTINY) { - double dx = vsrc[0] + ndp->vray[0]; - double dy = vsrc[1] + ndp->vray[1]; - if (dx*dx + dy*dy <= (4./PI)*(omega + tomega + - 2.*sqrt(omega*tomega))) - return(0); + /* check if sampling BSDF */ + if ((tsr = sqrt(tomega)) > 0) { + nsamp = 4.*specjitter*ndp->pr->rweight + .5; + nsamp += !nsamp; } - /* assign number of samples */ - sf = specjitter * ndp->pr->rweight; - if (tomega <= 0) - nsamp = 1; - else if (25.*tomega <= omega) - nsamp = 100.*sf + .5; - else - nsamp = 4.*sf*omega/tomega + .5; - nsamp += !nsamp; - sf = sqrt(omega); /* sample our source area */ - tsr = sqrt(tomega); - for (i = nsamp; i--; ) { - VCOPY(vsmp, vsrc); /* jitter query directions */ - if (nsamp > 1) { - multisamp(sd, 2, (i + frandom())/(double)nsamp); - vsmp[0] += (sd[0] - .5)*sf; - vsmp[1] += (sd[1] - .5)*sf; - normalize(vsmp); - } + for (i = nsamp; i--; ) { /* jitter to fuzz BSDF cells */ + FVECT vjit; bsdf_jitter(vjit, ndp, tsr); /* compute BSDF */ - ec = SDevalBSDF(&sv, vjit, vsmp, ndp->sd); + ec = SDevalBSDF(&sv, vjit, vsrc, ndp->sd); if (ec) goto baderror; - if (sv.cieY - diffY <= FTINY) - continue; /* no specular part */ + if (sv.cieY - diffY <= FTINY) { + ++scnt; /* still counts as 0 contribution */ + continue; + } /* check for variable resolution */ - ec = SDsizeBSDF(&tomega2, vjit, vsmp, SDqueryMin, ndp->sd); + ec = SDsizeBSDF(&tomega2, vjit, vsrc, SDqueryMin, ndp->sd); if (ec) goto baderror; if (tomega2 < .12*tomega) continue; /* not safe to include */ cvt_sdcolor(csmp, &sv); - addcolor(cval, csmp); /* else average it in */ - ++ok; + saddscolor(scval, csmp); + ++scnt; } - if (!ok) /* no valid specular samples? */ + if (!scnt) /* no valid specular samples? */ return(0); - sf = 1./(double)ok; /* compute average BSDF */ - scalecolor(cval, sf); + scalescolor(scval, 1./scnt); /* weighted average BSDF */ /* subtract diffuse contribution */ - for (i = 3*(diffY > FTINY); i--; ) - if ((colval(cval,i) -= colval(cdiff,i)) < 0) - colval(cval,i) = 0; + for (i = NCSAMP*(diffY > FTINY); i--; ) + if ((scval[i] -= cdiff[i]) < 0) + scval[i] = 0; return(1); baderror: objerror(ndp->mp, USER, transSDError(ec)); @@ -290,7 +344,7 @@ baderror: /* Compute source contribution for BSDF (reflected & transmitted) */ static void dir_bsdf( - COLOR cval, /* returned coefficient */ + SCOLOR scval, /* returned coefficient */ void *nnp, /* material data */ FVECT ldir, /* light source direction */ double omega /* light source size */ @@ -299,52 +353,52 @@ dir_bsdf( BSDFDAT *np = (BSDFDAT *)nnp; double ldot; double dtmp; - COLOR ctmp; + SCOLOR sctmp; - setcolor(cval, 0, 0, 0); + scolorblack(scval); ldot = DOT(np->pnorm, ldir); if ((-FTINY <= ldot) & (ldot <= FTINY)) return; - if (ldot > 0 && bright(np->rdiff) > FTINY) { + if (ldot > 0 && sintens(np->rdiff) > FTINY) { /* * Compute diffuse reflected component */ - copycolor(ctmp, np->rdiff); + copyscolor(sctmp, np->rdiff); dtmp = ldot * omega * (1./PI); - scalecolor(ctmp, dtmp); - addcolor(cval, ctmp); + scalescolor(sctmp, dtmp); + saddscolor(scval, sctmp); } - if (ldot < 0 && bright(np->tdiff) > FTINY) { + if (ldot < 0 && sintens(np->tdiff) > FTINY) { /* * Compute diffuse transmission */ - copycolor(ctmp, np->tdiff); - dtmp = -ldot * omega * (1.0/PI); - scalecolor(ctmp, dtmp); - addcolor(cval, ctmp); + copyscolor(sctmp, np->tdiff); + dtmp = -ldot * omega * (1./PI); + scalescolor(sctmp, dtmp); + saddscolor(scval, sctmp); } if (ambRayInPmap(np->pr)) return; /* specular already in photon map */ /* * Compute specular scattering coefficient using BSDF */ - if (!direct_specular_OK(ctmp, ldir, omega, np)) + if (!direct_specular_OK(sctmp, ldir, omega, np)) return; if (ldot < 0) { /* pattern for specular transmission */ - multcolor(ctmp, np->pr->pcol); + smultscolor(sctmp, np->pr->pcol); dtmp = -ldot * omega; } else dtmp = ldot * omega; - scalecolor(ctmp, dtmp); - addcolor(cval, ctmp); + scalescolor(sctmp, dtmp); + saddscolor(scval, sctmp); } /* Compute source contribution for BSDF (reflected only) */ static void dir_brdf( - COLOR cval, /* returned coefficient */ + SCOLOR scval, /* returned coefficient */ void *nnp, /* material data */ FVECT ldir, /* light source direction */ double omega /* light source size */ @@ -353,40 +407,40 @@ dir_brdf( BSDFDAT *np = (BSDFDAT *)nnp; double ldot; double dtmp; - COLOR ctmp, ctmp1, ctmp2; + SCOLOR sctmp; - setcolor(cval, 0, 0, 0); + scolorblack(scval); ldot = DOT(np->pnorm, ldir); if (ldot <= FTINY) return; - if (bright(np->rdiff) > FTINY) { + if (sintens(np->rdiff) > FTINY) { /* * Compute diffuse reflected component */ - copycolor(ctmp, np->rdiff); + copyscolor(sctmp, np->rdiff); dtmp = ldot * omega * (1./PI); - scalecolor(ctmp, dtmp); - addcolor(cval, ctmp); + scalescolor(sctmp, dtmp); + saddscolor(scval, sctmp); } if (ambRayInPmap(np->pr)) return; /* specular already in photon map */ /* * Compute specular reflection coefficient using BSDF */ - if (!direct_specular_OK(ctmp, ldir, omega, np)) + if (!direct_specular_OK(sctmp, ldir, omega, np)) return; dtmp = ldot * omega; - scalecolor(ctmp, dtmp); - addcolor(cval, ctmp); + scalescolor(sctmp, dtmp); + saddscolor(scval, sctmp); } /* Compute source contribution for BSDF (transmitted only) */ static void dir_btdf( - COLOR cval, /* returned coefficient */ + SCOLOR scval, /* returned coefficient */ void *nnp, /* material data */ FVECT ldir, /* light source direction */ double omega /* light source size */ @@ -395,52 +449,53 @@ dir_btdf( BSDFDAT *np = (BSDFDAT *)nnp; double ldot; double dtmp; - COLOR ctmp; + SCOLOR sctmp; - setcolor(cval, 0, 0, 0); + scolorblack(scval); ldot = DOT(np->pnorm, ldir); if (ldot >= -FTINY) return; - if (bright(np->tdiff) > FTINY) { + if (sintens(np->tdiff) > FTINY) { /* * Compute diffuse transmission */ - copycolor(ctmp, np->tdiff); - dtmp = -ldot * omega * (1.0/PI); - scalecolor(ctmp, dtmp); - addcolor(cval, ctmp); + copyscolor(sctmp, np->tdiff); + dtmp = -ldot * omega * (1./PI); + scalescolor(sctmp, dtmp); + saddscolor(scval, sctmp); } if (ambRayInPmap(np->pr)) return; /* specular already in photon map */ /* * Compute specular scattering coefficient using BSDF */ - if (!direct_specular_OK(ctmp, ldir, omega, np)) + if (!direct_specular_OK(sctmp, ldir, omega, np)) return; /* full pattern on transmission */ - multcolor(ctmp, np->pr->pcol); + smultscolor(sctmp, np->pr->pcol); dtmp = -ldot * omega; - scalecolor(ctmp, dtmp); - addcolor(cval, ctmp); + scalescolor(sctmp, dtmp); + saddscolor(scval, sctmp); } /* Sample separate BSDF component */ static int sample_sdcomp(BSDFDAT *ndp, SDComponent *dcp, int xmit) { - int hasthru = (xmit && !(ndp->pr->crtype & (SPECULAR|AMBIENT)) - && bright(ndp->cthru) > FTINY); - int nstarget = 1; - int nsent = 0; - int n; - SDError ec; - SDValue bsv; - double xrand; - FVECT vsmp, vinc; - RAY sr; + const int hasthru = (xmit && + !(ndp->pr->crtype & (SPECULAR|AMBIENT)) + && sintens(ndp->cthru) > FTINY); + int nstarget = 1; + int nsent = 0; + int n; + SDError ec; + SDValue bsv; + double xrand; + FVECT vsmp, vinc; + RAY sr; /* multiple samples? */ if (specjitter > 1.5) { nstarget = specjitter*ndp->pr->rweight + .5; @@ -477,17 +532,21 @@ sample_sdcomp(BSDFDAT *ndp, SDComponent *dcp, int xmit bsv.cieY /= (double)nstarget; cvt_sdcolor(sr.rcoef, &bsv); /* use sample color */ if (xmit) /* apply pattern on transmit */ - multcolor(sr.rcoef, ndp->pr->pcol); - if (rayorigin(&sr, SPECULAR, ndp->pr, sr.rcoef) < 0) { - if (maxdepth > 0) - break; - continue; /* Russian roulette victim */ + smultscolor(sr.rcoef, ndp->pr->pcol); + if (rayorigin(&sr, xmit ? TSPECULAR : RSPECULAR, ndp->pr, sr.rcoef) < 0) { + if (!n & (nstarget > 1)) { + n = nstarget; /* avoid infinitue loop */ + nstarget = nstarget*sr.rweight/(minweight + 1e-20); + if (n == nstarget) break; + n = -1; /* moved target */ + } + continue; /* try again */ } if (xmit && ndp->thick != 0) /* need to offset origin? */ VSUM(sr.rorg, sr.rorg, ndp->pr->ron, -ndp->thick); rayvalue(&sr); /* send & evaluate sample */ - multcolor(sr.rcol, sr.rcoef); - addcolor(ndp->pr->rcol, sr.rcol); + smultscolor(sr.rcol, sr.rcoef); + saddscolor(ndp->pr->rcol, sr.rcol); ++nsent; } return(nsent); @@ -497,9 +556,9 @@ sample_sdcomp(BSDFDAT *ndp, SDComponent *dcp, int xmit static int sample_sdf(BSDFDAT *ndp, int sflags) { - int hasthru = (sflags == SDsampSpT - && !(ndp->pr->crtype & (SPECULAR|AMBIENT)) - && bright(ndp->cthru) > FTINY); + int hasthru = (sflags == SDsampSpT && + !(ndp->pr->crtype & (SPECULAR|AMBIENT)) + && sintens(ndp->cthru) > FTINY); int n, ntotal = 0; double b = 0; SDSpectralDF *dfp; @@ -518,43 +577,43 @@ sample_sdf(BSDFDAT *ndp, int sflags) else dfp = ndp->sd->rb; } - setcolor(unsc, 0, 0, 0); + scolorblack(unsc); if (dfp == NULL) /* no specular component? */ return(0); - dimlist[ndims++] = (int)(size_t)ndp->mp; if (hasthru) { /* separate view sample? */ RAY tr; if (rayorigin(&tr, TRANS, ndp->pr, ndp->cthru) == 0) { VCOPY(tr.rdir, ndp->pr->rdir); rayvalue(&tr); - multcolor(tr.rcol, tr.rcoef); - addcolor(ndp->pr->rcol, tr.rcol); + smultscolor(tr.rcol, tr.rcoef); + saddscolor(ndp->pr->rcol, tr.rcol); + ndp->pr->rxt = ndp->pr->rot + raydistance(&tr); ++ntotal; - b = bright(ndp->cthru); + b = pbright(ndp->cthru); } else hasthru = 0; } - ndims--; - if (dfp->maxHemi - b <= FTINY) { /* how specular to sample? */ + if (dfp->maxHemi - b <= FTINY) { /* have specular to sample? */ b = 0; } else { FVECT vjit; bsdf_jitter(vjit, ndp, ndp->sr_vpsa[1]); b = SDdirectHemi(vjit, sflags, ndp->sd) - b; - if (b < 0) b = 0; + b *= (b > 0); } if (b <= specthresh+FTINY) { /* below sampling threshold? */ if (b > FTINY) { /* XXX no color from BSDF */ if (sflags == SDsampSpT) { - copycolor(unsc, ndp->pr->pcol); - scalecolor(unsc, b); + copyscolor(unsc, ndp->pr->pcol); + scalescolor(unsc, b); } else /* no pattern on reflection */ - setcolor(unsc, b, b, b); + setscolor(unsc, b, b, b); } return(ntotal); } - ndims += 2; /* else sample specular */ + dimlist[ndims] = (int)(size_t)ndp->mp; /* else sample specular */ + ndims += 2; for (n = dfp->ncomp; n--; ) { /* loop over components */ dimlist[ndims-1] = n + 9438; ntotal += sample_sdcomp(ndp, &dfp->comp[n], sflags==SDsampSpT); @@ -567,29 +626,31 @@ sample_sdf(BSDFDAT *ndp, int sflags) int m_bsdf(OBJREC *m, RAY *r) { - int hitfront; - COLOR ctmp; + const int hasthick = (m->otype == MAT_BSDF); + const int hitfront = (r->rod > 0); + SCOLOR sctmp; SDError ec; FVECT upvec, vtmp; MFUNC *mf; BSDFDAT nd; + /* check backface visibility */ + if (!hitfront & !backvis) { + raytrans(r); + return(1); + } /* check arguments */ - if ((m->oargs.nsargs < 6) | (m->oargs.nfargs > 9) | + if ((m->oargs.nsargs < hasthick+5) | (m->oargs.nfargs > 9) | (m->oargs.nfargs % 3)) objerror(m, USER, "bad # arguments"); - /* record surface struck */ - hitfront = (r->rod > 0); /* load cal file */ - mf = getfunc(m, 5, 0x1d, 1); + mf = hasthick ? getfunc(m, 5, 0x1d, 1) + : getfunc(m, 4, 0xe, 1) ; setfunc(m, r); - /* get thickness */ - nd.thick = evalue(mf->ep[0]); - if ((-FTINY <= nd.thick) & (nd.thick <= FTINY)) - nd.thick = 0; - /* check backface visibility */ - if (!hitfront & !backvis) { - raytrans(r); - return(1); + nd.thick = 0; /* set thickness */ + if (hasthick) { + nd.thick = evalue(mf->ep[0]); + if ((-FTINY <= nd.thick) & (nd.thick <= FTINY)) + nd.thick = 0; } /* check other rays to pass */ if (nd.thick != 0 && (r->crtype & SHADOW || @@ -598,48 +659,52 @@ m_bsdf(OBJREC *m, RAY *r) raytrans(r); /* hide our proxy */ return(1); } + if (hasthick && r->crtype & SHADOW) /* early shadow check #1 */ + return(1); nd.mp = m; nd.pr = r; /* get BSDF data */ - nd.sd = loadBSDF(m->oargs.sarg[1]); - /* early shadow check */ - if (r->crtype & SHADOW && (nd.sd->tf == NULL) & (nd.sd->tb == NULL)) + nd.sd = loadBSDF(m->oargs.sarg[hasthick]); + /* early shadow check #2 */ + if (r->crtype & SHADOW && (nd.sd->tf == NULL) & (nd.sd->tb == NULL)) { + SDfreeCache(nd.sd); return(1); - /* diffuse reflectance */ + } + /* diffuse components */ if (hitfront) { cvt_sdcolor(nd.rdiff, &nd.sd->rLambFront); if (m->oargs.nfargs >= 3) { - setcolor(ctmp, m->oargs.farg[0], + setscolor(sctmp, m->oargs.farg[0], m->oargs.farg[1], m->oargs.farg[2]); - addcolor(nd.rdiff, ctmp); + saddscolor(nd.rdiff, sctmp); } + cvt_sdcolor(nd.tdiff, &nd.sd->tLambFront); } else { cvt_sdcolor(nd.rdiff, &nd.sd->rLambBack); if (m->oargs.nfargs >= 6) { - setcolor(ctmp, m->oargs.farg[3], + setscolor(sctmp, m->oargs.farg[3], m->oargs.farg[4], m->oargs.farg[5]); - addcolor(nd.rdiff, ctmp); + saddscolor(nd.rdiff, sctmp); } + cvt_sdcolor(nd.tdiff, &nd.sd->tLambBack); } - /* diffuse transmittance */ - cvt_sdcolor(nd.tdiff, &nd.sd->tLamb); - if (m->oargs.nfargs >= 9) { - setcolor(ctmp, m->oargs.farg[6], + if (m->oargs.nfargs >= 9) { /* add diffuse transmittance? */ + setscolor(sctmp, m->oargs.farg[6], m->oargs.farg[7], m->oargs.farg[8]); - addcolor(nd.tdiff, ctmp); + saddscolor(nd.tdiff, sctmp); } /* get modifiers */ raytexture(r, m->omod); /* modify diffuse values */ - multcolor(nd.rdiff, r->pcol); - multcolor(nd.tdiff, r->pcol); + smultscolor(nd.rdiff, r->pcol); + smultscolor(nd.tdiff, r->pcol); /* get up vector */ - upvec[0] = evalue(mf->ep[1]); - upvec[1] = evalue(mf->ep[2]); - upvec[2] = evalue(mf->ep[3]); + upvec[0] = evalue(mf->ep[hasthick+0]); + upvec[1] = evalue(mf->ep[hasthick+1]); + upvec[2] = evalue(mf->ep[hasthick+2]); /* return to world coords */ if (mf->fxp != &unitxf) { multv3(upvec, upvec, mf->fxp->xfm); @@ -660,18 +725,24 @@ m_bsdf(OBJREC *m, RAY *r) } if (ec) { objerror(m, WARNING, "Illegal orientation vector"); + SDfreeCache(nd.sd); return(1); } - compute_through(&nd); /* compute through component */ - if (r->crtype & SHADOW) { - RAY tr; /* attempt to pass shadow ray */ - if (rayorigin(&tr, TRANS, r, nd.cthru) < 0) - return(1); /* blocked */ - VCOPY(tr.rdir, r->rdir); - rayvalue(&tr); /* transmit with scaling */ - multcolor(tr.rcol, tr.rcoef); - copycolor(r->rcol, tr.rcol); - return(1); /* we're done */ + scolorblack(nd.cthru); /* consider through component */ + scolorblack(nd.cthru_surr); + if (m->otype == MAT_ABSDF) { + compute_through(&nd); + if (r->crtype & SHADOW) { + RAY tr; /* attempt to pass shadow ray */ + SDfreeCache(nd.sd); + if (rayorigin(&tr, TRANS, r, nd.cthru) < 0) + return(1); /* no through component */ + VCOPY(tr.rdir, r->rdir); + rayvalue(&tr); /* transmit with scaling */ + smultscolor(tr.rcol, tr.rcoef); + copyscolor(r->rcol, tr.rcol); + return(1); /* we're done */ + } } ec = SDinvXform(nd.fromloc, nd.toloc); if (!ec) /* determine BSDF resolution */ @@ -692,39 +763,31 @@ m_bsdf(OBJREC *m, RAY *r) /* sample transmission */ sample_sdf(&nd, SDsampSpT); /* compute indirect diffuse */ - copycolor(ctmp, nd.rdiff); - addcolor(ctmp, nd.runsamp); - if (bright(ctmp) > FTINY) { /* ambient from reflection */ - if (!hitfront) - flipsurface(r); - multambient(ctmp, r, nd.pnorm); - addcolor(r->rcol, ctmp); - if (!hitfront) - flipsurface(r); + copyscolor(sctmp, nd.rdiff); + saddscolor(sctmp, nd.runsamp); + if (sintens(sctmp) > FTINY) { /* ambient from reflection */ + multambient(sctmp, r, nd.pnorm); + saddscolor(r->rcol, sctmp); } - copycolor(ctmp, nd.tdiff); - addcolor(ctmp, nd.tunsamp); - if (bright(ctmp) > FTINY) { /* ambient from other side */ + copyscolor(sctmp, nd.tdiff); + saddscolor(sctmp, nd.tunsamp); + if (sintens(sctmp) > FTINY) { /* ambient from other side */ FVECT bnorm; - if (hitfront) - flipsurface(r); bnorm[0] = -nd.pnorm[0]; bnorm[1] = -nd.pnorm[1]; bnorm[2] = -nd.pnorm[2]; if (nd.thick != 0) { /* proxy with offset? */ VCOPY(vtmp, r->rop); VSUM(r->rop, vtmp, r->ron, nd.thick); - multambient(ctmp, r, bnorm); + multambient(sctmp, r, bnorm); VCOPY(r->rop, vtmp); } else - multambient(ctmp, r, bnorm); - addcolor(r->rcol, ctmp); - if (hitfront) - flipsurface(r); + multambient(sctmp, r, bnorm); + saddscolor(r->rcol, sctmp); } /* add direct component */ - if ((bright(nd.tdiff) <= FTINY) & (nd.sd->tf == NULL) & - (nd.sd->tb == NULL)) { + if ((nd.sd->tf == NULL) & (nd.sd->tb == NULL) && + sintens(nd.tdiff) <= FTINY) { direct(r, dir_brdf, &nd); /* reflection only */ } else if (nd.thick == 0) { direct(r, dir_bsdf, &nd); /* thin surface scattering */