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#include "random.h" |
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#define MINSAMPLES 3 /* minimum number of pretest samples */ |
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#define STESTMAX 30 /* maximum seeks per sample */ |
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double getdisk(); |
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static OBJECT *vobject; /* virtual source objects */ |
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register int sn; |
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MAT4 pm; |
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{ |
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FVECT nsloc, nsnorm, ocent; |
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double maxrad2; |
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FVECT nsloc, nsnorm, ocent, v; |
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double maxrad2, d; |
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int nsflags; |
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double d1; |
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SPOT theirspot, ourspot; |
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register int i; |
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if (source[sn].sflags & SSPOT) { |
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copystruct(&theirspot, source[sn].sl.s); |
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multp3(theirspot.aim, source[sn].sl.s->aim, pm); |
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d = ourspot.siz; |
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if (!commonbeam(&ourspot, &theirspot, nsloc)) |
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return(-1); /* no overlap */ |
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return(-1); /* no overlap */ |
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if (ourspot.siz < d-FTINY) { /* it shrunk */ |
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d = beamdisk(v, op, &ourspot, nsloc); |
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if (d <= FTINY) |
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return(-1); |
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if (d < maxrad2) { |
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maxrad2 = d; |
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VCOPY(ocent, v); |
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} |
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} |
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} |
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} else { /* local source */ |
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multp3(nsloc, source[sn].sloc, pm); |
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for (i = 0; i < 3; i++) |
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ourspot.aim[i] = ocent[i] - nsloc[i]; |
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if ((d1 = normalize(ourspot.aim)) == 0.) |
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if ((d = normalize(ourspot.aim)) == 0.) |
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return(-1); /* at source!! */ |
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if (source[sn].sflags & SPROX && d1 > source[sn].sl.prox) |
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if (source[sn].sflags & SPROX && d > source[sn].sl.prox) |
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return(-1); /* too far away */ |
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ourspot.siz = 2.*PI*(1. - d1/sqrt(d1*d1+maxrad2)); |
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ourspot.siz = 2.*PI*(1. - d/sqrt(d*d+maxrad2)); |
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ourspot.flen = 0.; |
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if (source[sn].sflags & SSPOT) { |
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copystruct(&theirspot, source[sn].sl.s); |
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multv3(theirspot.aim, source[sn].sl.s->aim, pm); |
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d = ourspot.siz; |
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if (!commonspot(&ourspot, &theirspot, nsloc)) |
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return(-1); /* no overlap */ |
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if (ourspot.siz < d-FTINY) { /* it shrunk */ |
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d = spotdisk(v, op, &ourspot, nsloc); |
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if (d <= FTINY) |
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return(-1); |
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if (d < maxrad2) { |
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maxrad2 = d; |
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VCOPY(ocent, v); |
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} |
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} |
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ourspot.flen = theirspot.flen; |
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} |
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if (source[sn].sflags & SFLAT) { /* behind source? */ |
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multv3(nsnorm, source[sn].snorm, pm); |
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if (checkspot(&ourspot, nsnorm) < 0) |
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if (!checkspot(&ourspot, nsnorm)) |
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return(-1); |
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} |
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} |
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double rad2, roffs, offs, d, rd, rdoto; |
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FVECT rnrm, nrm; |
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/* first, use object getdisk function */ |
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rad2 = (*sfun[op->otype].of->getdisk)(oc, op); |
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rad2 = getmaxdisk(oc, op); |
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if (!(source[sn].sflags & SVIRTUAL)) |
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return(rad2); /* all done for normal source */ |
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/* check for correct side of relay surface */ |
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roffs = (*sfun[source[sn].so->otype].of->getpleq)(rnrm, source[sn].so); |
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roffs = getplaneq(rnrm, source[sn].so); |
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rd = DOT(rnrm, source[sn].sloc); /* source projection */ |
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if (!(source[sn].sflags & SDISTANT)) |
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rd -= roffs; |
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if ((d > 0.) ^ (rd > 0.)) |
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return(rad2); /* OK if opposite sides */ |
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if (d*d >= rad2) |
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return(.0); /* no relay is possible */ |
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return(0.); /* no relay is possible */ |
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/* we need a closer look */ |
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offs = (*sfun[op->otype].of->getpleq)(nrm, op); |
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offs = getplaneq(nrm, op); |
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rdoto = DOT(rnrm, nrm); |
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if (d*d >= rad2*(1.-rdoto*rdoto)) |
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return(0.); /* disk entirely on projection side */ |
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double or, d; |
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int infront; |
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int ssn; |
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int nok, nhit; |
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int nhit, nok; |
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register int i, n; |
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/* return if pretesting disabled */ |
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if (vspretest <= 0) |
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return(f); |
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/* get surface normal */ |
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(*sfun[o->otype].of->getpleq)(onorm, o); |
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> |
getplaneq(onorm, o); |
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/* set number of rays to sample */ |
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if (source[sn].sflags & SDISTANT) { |
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n = (2./3.*PI*PI)*or2/(thescene.cusize*thescene.cusize)* |
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vspretest + .5; |
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infront = DOT(onorm, source[sn].sloc) > 0.; |
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} else { |
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n = or2/dist2(oc,source[sn].sloc)*vspretest + .5; |
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for (i = 0; i < 3; i++) |
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offsdir[i] = source[sn].sloc[i] - oc[i]; |
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n = or2/DOT(offsdir,offsdir)*vspretest + .5; |
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infront = DOT(onorm, offsdir) > 0.; |
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} |
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< |
if (n < 1) n = 1; |
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> |
if (n < MINSAMPLES) n = MINSAMPLES; |
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#ifdef DEBUG |
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fprintf(stderr, "pretesting source %d in object %s with %d rays\n", |
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sn, o->oname, n); |
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#endif |
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/* sample */ |
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or = sqrt(or2); |
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ssn = 7*n; |
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> |
ssn = STESTMAX*n; |
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nhit = nok = 0; |
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while (n-- > 0) { |
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/* get sample point */ |
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do { |
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if (--ssn < 0) |
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> |
if (--ssn < 0) { |
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#ifdef DEBUG |
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> |
fprintf(stderr, "\ttoo hard to hit\n"); |
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> |
#endif |
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return(f); /* too small a target! */ |
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} |
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for (i = 0; i < 3; i++) |
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offsdir[i] = or*(1. - |
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2.*urand(931*i+5827+ssn)); |
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} while (!(*ofun[o->otype].funp)(o, &sr)); |
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/* check against source */ |
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samplendx++; |
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< |
if (srcray(&sr, NULL, sn) == 0.0) |
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> |
if (srcray(&sr, NULL, sn) == 0.) |
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continue; |
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sr.revf = srcvalue; |
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rayvalue(&sr); |
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/* check against obstructions */ |
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srcray(&sr, NULL, sn); |
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rayvalue(&sr); |
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< |
if (bright(sr.rcol) <= FTINY) |
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< |
continue; |
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< |
nhit++; |
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> |
if (bright(sr.rcol) > FTINY) |
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> |
nhit++; |
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> |
if (nhit > 0 && nhit < nok) { |
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> |
#ifdef DEBUG |
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> |
fprintf(stderr, "\tpartially occluded\n"); |
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> |
#endif |
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> |
return(f); /* need to shadow test */ |
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> |
} |
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} |
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< |
/* interpret results */ |
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< |
if (nhit == 0) |
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> |
if (nhit == 0) { |
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> |
#ifdef DEBUG |
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> |
fprintf(stderr, "\t0%% hit rate\n"); |
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> |
#endif |
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return(f | SSKIP); /* 0% hit rate: totally occluded */ |
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< |
if (nhit == nok) |
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< |
return(f & ~SFOLLOW); /* 100% hit rate: no occlusion */ |
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< |
return(f); /* no comment */ |
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> |
} |
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> |
#ifdef DEBUG |
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> |
fprintf(stderr, "\t100%% hit rate\n"); |
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> |
#endif |
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> |
return(f & ~SFOLLOW); /* 100% hit rate: no occlusion */ |
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} |
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