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#include "copyright.h" |
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#include "ray.h" |
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#include "paths.h" |
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#include "ambient.h" |
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#include "source.h" |
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#include "func.h" |
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* rdt gdt bdt |
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*/ |
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|
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/* |
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* Note that our reverse ray-tracing process means that the positions |
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* of incoming and outgoing vectors may be reversed in our calls |
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* to the BSDF library. This is fine, since the bidirectional nature |
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* of the BSDF (that's what the 'B' stands for) means it all works out. |
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*/ |
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|
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typedef struct { |
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OBJREC *mp; /* material pointer */ |
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RAY *pr; /* intersected ray */ |
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FVECT pnorm; /* perturbed surface normal */ |
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< |
FVECT vinc; /* local incident vector */ |
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> |
FVECT vray; /* local outgoing (return) vector */ |
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> |
double sr_vpsa; /* sqrt of BSDF projected solid angle */ |
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RREAL toloc[3][3]; /* world to local BSDF coords */ |
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RREAL fromloc[3][3]; /* local BSDF coords to world */ |
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double thick; /* surface thickness */ |
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|
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#define cvt_sdcolor(cv, svp) ccy2rgb(&(svp)->spec, (svp)->cieY, cv) |
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|
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/* Convert error from BSDF library */ |
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static char * |
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cvt_sderr(SDError ec) |
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> |
/* Jitter ray sample according to projected solid angle and specjitter */ |
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static void |
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bsdf_jitter(FVECT vres, BSDFDAT *ndp) |
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{ |
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if (!SDerrorDetail[0]) |
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return(strcpy(errmsg, SDerrorEnglish[ec])); |
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sprintf(errmsg, "%s: %s", SDerrorEnglish[ec], SDerrorDetail); |
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return(errmsg); |
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double sr_psa = ndp->sr_vpsa; |
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> |
|
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VCOPY(vres, ndp->vray); |
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if (specjitter < 1.) |
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sr_psa *= specjitter; |
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if (sr_psa <= FTINY) |
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return; |
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vres[0] += sr_psa*(.5 - frandom()); |
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vres[1] += sr_psa*(.5 - frandom()); |
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normalize(vres); |
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} |
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|
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/* Compute source contribution for BSDF */ |
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double omega /* light source size */ |
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) |
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{ |
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BSDFDAT *np = nnp; |
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BSDFDAT *np = (BSDFDAT *)nnp; |
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SDError ec; |
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SDValue sv; |
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FVECT vout; |
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FVECT vsrc; |
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FVECT vjit; |
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double ldot; |
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double dtmp; |
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COLOR ctmp; |
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/* |
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* Compute scattering coefficient using BSDF. |
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*/ |
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if (SDmapDir(vout, np->toloc, ldir) != SDEnone) |
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if (SDmapDir(vsrc, np->toloc, ldir) != SDEnone) |
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return; |
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ec = SDevalBSDF(&sv, vout, np->vinc, np->sd); |
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bsdf_jitter(vjit, np); |
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ec = SDevalBSDF(&sv, vjit, vsrc, np->sd); |
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if (ec) |
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objerror(np->mp, USER, cvt_sderr(ec)); |
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objerror(np->mp, USER, transSDError(ec)); |
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|
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if (sv.cieY <= FTINY) /* not worth using? */ |
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return; |
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scalecolor(ctmp2, dtmp); |
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setcolor(ctmp1, 1.-dtmp, 1.-dtmp, 1.-dtmp); |
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addcolor(ctmp1, ctmp2); |
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multcolor(ctmp, ctmp1); /* apply desaturated pattern */ |
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multcolor(ctmp, ctmp1); /* apply derated pattern */ |
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dtmp = ldot * omega; |
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} else { /* full pattern on transmission */ |
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multcolor(ctmp, np->pr->pcol); |
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SDError ec; |
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SDValue bsv; |
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double sthick; |
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< |
FVECT vout; |
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> |
FVECT vjit, vsmp; |
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RAY sr; |
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int ntrials; |
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/* multiple samples? */ |
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for (ntrials = 0; nsent < nstarget && ntrials < 9*nstarget; ntrials++) { |
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SDerrorDetail[0] = '\0'; |
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/* sample direction & coef. */ |
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ec = SDsampComponent(&bsv, vout, ndp->vinc, |
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ntrials ? frandom() |
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: urand(ilhash(dimlist,ndims)+samplendx), |
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dcp); |
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> |
bsdf_jitter(vjit, ndp); |
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> |
ec = SDsampComponent(&bsv, vsmp, vjit, ntrials ? frandom() |
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> |
: urand(ilhash(dimlist,ndims)+samplendx), dcp); |
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if (ec) |
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objerror(ndp->mp, USER, cvt_sderr(ec)); |
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> |
objerror(ndp->mp, USER, transSDError(ec)); |
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/* zero component? */ |
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if (bsv.cieY <= FTINY) |
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break; |
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/* map vector to world */ |
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< |
if (SDmapDir(sr.rdir, ndp->fromloc, vout) != SDEnone) |
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> |
if (SDmapDir(sr.rdir, ndp->fromloc, vsmp) != SDEnone) |
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break; |
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/* unintentional penetration? */ |
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if (DOT(sr.rdir, ndp->pr->ron) > .0 ^ vout[2] > .0) |
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> |
if (DOT(sr.rdir, ndp->pr->ron) > .0 ^ vsmp[2] > .0) |
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continue; |
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/* spawn a specular ray */ |
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if (nstarget > 1) |
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++nsent; /* Russian roulette victim */ |
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continue; |
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} |
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< |
/* need to move origin? */ |
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< |
sthick = (ndp->pr->rod > .0) ? -ndp->thick : ndp->thick; |
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< |
if (sthick < .0 ^ vout[2] > .0) |
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< |
VSUM(sr.rorg, sr.rorg, ndp->pr->ron, sthick); |
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< |
|
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> |
if (ndp->thick > FTINY) { /* need to move origin? */ |
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> |
sthick = (ndp->pr->rod > .0) ? -ndp->thick : ndp->thick; |
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if (sthick < .0 ^ vsmp[2] > .0) |
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VSUM(sr.rorg, sr.rorg, ndp->pr->ron, sthick); |
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> |
} |
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rayvalue(&sr); /* send & evaluate sample */ |
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multcolor(sr.rcol, sr.rcoef); |
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addcolor(ndp->pr->rcol, sr.rcol); |
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return(0); |
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/* below sampling threshold? */ |
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if (dfp->maxHemi <= specthresh+FTINY) { |
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< |
if (dfp->maxHemi > FTINY) { /* XXX no color from BSDF! */ |
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< |
double d = SDdirectHemi(ndp->vinc, sflags, ndp->sd); |
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> |
if (dfp->maxHemi > FTINY) { /* XXX no color from BSDF */ |
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> |
FVECT vjit; |
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> |
double d; |
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COLOR ctmp; |
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+ |
bsdf_jitter(vjit, ndp); |
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d = SDdirectHemi(vjit, sflags, ndp->sd); |
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if (sflags == SDsampSpT) { |
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copycolor(ctmp, ndp->pr->pcol); |
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scalecolor(ctmp, d); |
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(m->oargs.nfargs % 3)) |
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objerror(m, USER, "bad # arguments"); |
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|
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< |
SDerrorDetail[0] = '\0'; /* get BSDF data */ |
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< |
nd.sd = SDgetCache(m->oargs.sarg[1]); |
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< |
if (nd.sd == NULL) |
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< |
error(SYSTEM, "out of memory in m_bsdf"); |
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< |
if (!SDisLoaded(nd.sd)) { |
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< |
char *pname = getpath(m->oargs.sarg[1], getrlibpath(), R_OK); |
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< |
if (pname == NULL) { |
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< |
sprintf(errmsg, "cannot find BSDF file \"%s\"", |
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< |
m->oargs.sarg[1]); |
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< |
objerror(m, USER, errmsg); |
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< |
} |
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< |
ec = SDloadFile(nd.sd, pname); |
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< |
if (ec) |
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< |
objerror(m, USER, cvt_sderr(ec)); |
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< |
SDretainSet = SDretainAll; |
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< |
} |
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> |
/* get BSDF data */ |
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> |
nd.sd = loadBSDF(m->oargs.sarg[1]); |
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/* load cal file */ |
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mf = getfunc(m, 5, 0x1d, 1); |
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/* get thickness */ |
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nd.thick = .0; |
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/* check shadow */ |
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if (r->crtype & SHADOW) { |
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< |
SDfreeCache(nd.sd); |
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< |
if (nd.thick > FTINY && nd.sd->tf != NULL && |
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< |
nd.sd->tf->maxHemi > FTINY) |
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> |
if ((nd.thick > FTINY) & (nd.sd->tf != NULL)) |
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raytrans(r); /* pass-through */ |
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+ |
SDfreeCache(nd.sd); |
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return(1); /* else shadow */ |
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} |
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/* check unscattered ray */ |
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< |
if (!(r->crtype & (SPECULAR|AMBIENT)) && nd.thick > FTINY && |
| 310 |
< |
nd.sd->tf != NULL && nd.sd->tf->maxHemi > FTINY) { |
| 309 |
> |
if (!(r->crtype & (SPECULAR|AMBIENT)) && |
| 310 |
> |
(nd.thick > FTINY) & (nd.sd->tf != NULL)) { |
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SDfreeCache(nd.sd); |
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raytrans(r); /* pass-through */ |
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return(1); |
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m->oargs.farg[2]); |
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} else { |
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if (m->oargs.nfargs < 6) { /* check invisible backside */ |
| 325 |
< |
if (!backvis && (nd.sd->rb == NULL || |
| 326 |
< |
nd.sd->rb->maxHemi <= FTINY) && |
| 325 |
< |
(nd.sd->tf == NULL || |
| 326 |
< |
nd.sd->tf->maxHemi <= FTINY)) { |
| 325 |
> |
if (!backvis && (nd.sd->rb == NULL) & |
| 326 |
> |
(nd.sd->tf == NULL)) { |
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SDfreeCache(nd.sd); |
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raytrans(r); |
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return(1); |
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/* compute local BSDF xform */ |
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ec = SDcompXform(nd.toloc, nd.pnorm, upvec); |
| 367 |
|
if (!ec) { |
| 368 |
< |
nd.vinc[0] = -r->rdir[0]; |
| 369 |
< |
nd.vinc[1] = -r->rdir[1]; |
| 370 |
< |
nd.vinc[2] = -r->rdir[2]; |
| 371 |
< |
ec = SDmapDir(nd.vinc, nd.toloc, nd.vinc); |
| 368 |
> |
nd.vray[0] = -r->rdir[0]; |
| 369 |
> |
nd.vray[1] = -r->rdir[1]; |
| 370 |
> |
nd.vray[2] = -r->rdir[2]; |
| 371 |
> |
ec = SDmapDir(nd.vray, nd.toloc, nd.vray); |
| 372 |
|
} |
| 373 |
|
if (!ec) |
| 374 |
|
ec = SDinvXform(nd.fromloc, nd.toloc); |
| 375 |
< |
if (ec) { |
| 376 |
< |
objerror(m, WARNING, cvt_sderr(ec)); |
| 375 |
> |
/* determine BSDF resolution */ |
| 376 |
> |
if (!ec) |
| 377 |
> |
ec = SDsizeBSDF(&nd.sr_vpsa, nd.vray, SDqueryMin, nd.sd); |
| 378 |
> |
if (!ec) |
| 379 |
> |
nd.sr_vpsa = sqrt(nd.sr_vpsa); |
| 380 |
> |
else { |
| 381 |
> |
objerror(m, WARNING, transSDError(ec)); |
| 382 |
|
SDfreeCache(nd.sd); |
| 383 |
|
return(1); |
| 384 |
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} |
| 385 |
+ |
|
| 386 |
|
if (r->rod < .0) { /* perturb normal towards hit */ |
| 387 |
|
nd.pnorm[0] = -nd.pnorm[0]; |
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nd.pnorm[1] = -nd.pnorm[1]; |
