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#include "ray.h" |
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#include "octree.h" |
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#include "otypes.h" |
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#include "source.h" |
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#include "random.h" |
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double intercircle(), getdisk(); |
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#define DISKTFRAC 0.25 /* disk area pretest fraction */ |
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double getdisk(); |
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static OBJECT *vobject; /* virtual source objects */ |
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static int nvobjects = 0; /* number of virtual source objects */ |
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#endif |
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/* append virtual sources */ |
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for (i = nsources; i-- > 0; ) |
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if (!(source[i].sflags & SSKIP)) |
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addvirtuals(i, directrelay); |
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addvirtuals(i, directrelay); |
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/* done with our object list */ |
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free((char *)vobject); |
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nvobjects = 0; |
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/* check relay limit first */ |
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if (nr <= 0) |
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return; |
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if (source[sn].sflags & SSKIP) |
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return; |
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/* check each virtual object for projection */ |
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for (i = 0; i < nvobjects; i++) |
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/* vproject() calls us recursively */ |
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return(-1); |
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} |
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} |
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/* everything is OK, make source */ |
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/* pretest visibility */ |
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nsflags = vstestvis(nsflags, op, ocent, maxrad2, sn); |
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if (nsflags & SSKIP) |
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return(-1); /* obstructed */ |
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/* it all checks out, so make it */ |
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if ((i = newsource()) < 0) |
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goto memerr; |
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source[i].sflags = nsflags; |
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} |
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commonspot(sp1, sp2, org) /* set sp1 to intersection of sp1 and sp2 */ |
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register SPOT *sp1, *sp2; |
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FVECT org; |
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int |
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vstestvis(f, o, oc, or2, sn) /* pretest source visibility */ |
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int f; /* virtual source flags */ |
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OBJREC *o; /* relay object */ |
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FVECT oc; /* relay object center */ |
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double or2; /* relay object radius squared */ |
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register int sn; /* target source number */ |
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{ |
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FVECT cent; |
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double rad2, cos1, cos2; |
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|
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cos1 = 1. - sp1->siz/(2.*PI); |
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cos2 = 1. - sp2->siz/(2.*PI); |
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if (sp2->siz >= 2.*PI-FTINY) /* BIG, just check overlap */ |
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return(DOT(sp1->aim,sp2->aim) >= cos1*cos2 - |
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sqrt((1.-cos1*cos1)*(1.-cos2*cos2))); |
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/* compute and check disks */ |
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rad2 = intercircle(cent, sp1->aim, sp2->aim, |
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1./(cos1*cos1) - 1., 1./(cos2*cos2) - 1.); |
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if (rad2 <= FTINY || normalize(cent) == 0.) |
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return(0); |
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VCOPY(sp1->aim, cent); |
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sp1->siz = 2.*PI*(1. - 1./sqrt(1.+rad2)); |
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return(1); |
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} |
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commonbeam(sp1, sp2, dir) /* set sp1 to intersection of sp1 and sp2 */ |
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register SPOT *sp1, *sp2; |
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FVECT dir; |
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{ |
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FVECT cent, c1, c2; |
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double rad2, d; |
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register int i; |
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/* move centers to common plane */ |
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d = DOT(sp1->aim, dir); |
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for (i = 0; i < 3; i++) |
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c1[i] = sp1->aim[i] - d*dir[i]; |
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d = DOT(sp2->aim, dir); |
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for (i = 0; i < 3; i++) |
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c2[i] = sp2->aim[i] - d*dir[i]; |
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/* compute overlap */ |
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rad2 = intercircle(cent, c1, c2, sp1->siz/PI, sp2->siz/PI); |
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if (rad2 <= FTINY) |
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return(0); |
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VCOPY(sp1->aim, cent); |
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sp1->siz = PI*rad2; |
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return(1); |
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} |
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|
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|
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checkspot(sp, nrm) /* check spotlight for behind source */ |
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register SPOT *sp; |
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FVECT nrm; |
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{ |
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double d, d1; |
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|
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d = DOT(sp->aim, nrm); |
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if (d > FTINY) /* center in front? */ |
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return(0); |
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/* else check horizon */ |
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d1 = 1. - sp->siz/(2.*PI); |
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return(1.-FTINY-d*d > d1*d1); |
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} |
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276 |
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double |
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intercircle(cc, c1, c2, r1s, r2s) /* intersect two circles */ |
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FVECT cc; /* midpoint (return value) */ |
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FVECT c1, c2; /* circle centers */ |
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double r1s, r2s; /* radii squared */ |
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{ |
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double a2, d2, l; |
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FVECT disp; |
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register int i; |
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|
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for (i = 0; i < 3; i++) |
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disp[i] = c2[i] - c1[i]; |
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d2 = DOT(disp,disp); |
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/* circle within overlap? */ |
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if (r1s < r2s) { |
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if (r2s >= r1s + d2) { |
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VCOPY(cc, c1); |
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return(r1s); |
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} |
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} else { |
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if (r1s >= r2s + d2) { |
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VCOPY(cc, c2); |
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return(r2s); |
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} |
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RAY sr; |
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FVECT onorm; |
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FVECT offsdir; |
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double or, d; |
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int nok, nhit; |
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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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/* 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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else |
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n = or2/dist2(oc,source[sn].sloc)*vspretest + .5; |
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if (n < 1) n = 1; |
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/* limit tests to central region */ |
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or = DISKTFRAC*sqrt(or2); |
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/* sample */ |
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nhit = nok = 0; |
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while (n-- > 0) { |
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samplendx++; |
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/* |
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* We're being real sloppy with our sample locations here. |
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*/ |
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for (i = 0; i < 3; i++) |
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offsdir[i] = or*(1. - 2.*urand(931*i+5821+n)); |
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d = DOT(offsdir,onorm); |
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for (i = 0; i < 3; i++) |
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sr.rorg[i] = oc[i] + (1.-d)*offsdir[i]; |
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/* check against source */ |
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if (srcray(&sr, NULL, sn) == 0.0) |
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continue; |
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sr.revf = srcvalue; |
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> |
rayvalue(&sr); |
271 |
> |
if (bright(sr.rcol) <= FTINY) |
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continue; |
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> |
nok++; |
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/* check against obstructions */ |
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srcray(&sr, NULL, sn); |
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> |
rayvalue(&sr); |
277 |
> |
if (bright(sr.rcol) <= FTINY) |
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continue; |
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> |
nhit++; |
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} |
281 |
< |
a2 = .25*(2.*(r1s+r2s) - d2 - (r2s-r1s)*(r2s-r1s)/d2); |
282 |
< |
/* no overlap? */ |
283 |
< |
if (a2 <= 0.) |
284 |
< |
return(0.); |
285 |
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/* overlap, compute center */ |
286 |
< |
l = sqrt((r1s - a2)/d2); |
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< |
for (i = 0; i < 3; i++) |
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< |
cc[i] = c1[i] + l*disp[i]; |
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< |
return(a2); |
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> |
/* interpret results */ |
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> |
if (nhit == 0) |
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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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} |
288 |
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288 |
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289 |
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290 |
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#ifdef DEBUG |
291 |
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virtverb(sn, fp) /* print verbose description of virtual source */ |