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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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|
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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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|
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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); |
| 269 |
< |
if (rad2 <= FTINY) |
| 270 |
< |
return(0); |
| 271 |
< |
VCOPY(sp1->aim, cent); |
| 272 |
< |
sp1->siz = PI*rad2; |
| 273 |
< |
return(1); |
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< |
} |
| 275 |
< |
|
| 276 |
< |
|
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< |
checkspot(sp, nrm) /* check spotlight for behind source */ |
| 278 |
< |
register SPOT *sp; |
| 279 |
< |
FVECT nrm; |
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< |
{ |
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< |
double d, d1; |
| 267 |
< |
|
| 268 |
< |
d = DOT(sp->aim, nrm); |
| 269 |
< |
if (d > FTINY) /* center in front? */ |
| 270 |
< |
return(0); |
| 271 |
< |
/* else check horizon */ |
| 272 |
< |
d1 = 1. - sp->siz/(2.*PI); |
| 273 |
< |
return(1.-FTINY-d*d > d1*d1); |
| 274 |
< |
} |
| 275 |
< |
|
| 276 |
< |
|
| 277 |
< |
double |
| 278 |
< |
intercircle(cc, c1, c2, r1s, r2s) /* intersect two circles */ |
| 279 |
< |
FVECT cc; /* midpoint (return value) */ |
| 280 |
< |
FVECT c1, c2; /* circle centers */ |
| 281 |
< |
double r1s, r2s; /* radii squared */ |
| 282 |
< |
{ |
| 283 |
< |
double a2, d2, l; |
| 284 |
< |
FVECT disp; |
| 285 |
< |
register int i; |
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< |
|
| 287 |
< |
for (i = 0; i < 3; i++) |
| 288 |
< |
disp[i] = c2[i] - c1[i]; |
| 289 |
< |
d2 = DOT(disp,disp); |
| 290 |
< |
/* circle within overlap? */ |
| 291 |
< |
if (r1s < r2s) { |
| 292 |
< |
if (r2s >= r1s + d2) { |
| 293 |
< |
VCOPY(cc, c1); |
| 294 |
< |
return(r1s); |
| 295 |
< |
} |
| 296 |
< |
} else { |
| 297 |
< |
if (r1s >= r2s + d2) { |
| 298 |
< |
VCOPY(cc, c2); |
| 299 |
< |
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) |
| 242 |
> |
return(f); |
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> |
/* get surface normal */ |
| 244 |
> |
(*sfun[o->otype].of->getpleq)(onorm, o); |
| 245 |
> |
/* set number of rays to sample */ |
| 246 |
> |
if (source[sn].sflags & SDISTANT) |
| 247 |
> |
n = (2./3.*PI*PI)*or2/(thescene.cusize*thescene.cusize)* |
| 248 |
> |
vspretest + .5; |
| 249 |
> |
else |
| 250 |
> |
n = or2/dist2(oc,source[sn].sloc)*vspretest + .5; |
| 251 |
> |
if (n < 1) n = 1; |
| 252 |
> |
/* limit tests to central region */ |
| 253 |
> |
or = DISKTFRAC*sqrt(or2); |
| 254 |
> |
/* sample */ |
| 255 |
> |
nhit = nok = 0; |
| 256 |
> |
while (n-- > 0) { |
| 257 |
> |
samplendx++; |
| 258 |
> |
/* |
| 259 |
> |
* We're being real sloppy with our sample locations here. |
| 260 |
> |
*/ |
| 261 |
> |
for (i = 0; i < 3; i++) |
| 262 |
> |
offsdir[i] = or*(1. - 2.*urand(931*i+5821+n)); |
| 263 |
> |
d = DOT(offsdir,onorm); |
| 264 |
> |
for (i = 0; i < 3; i++) |
| 265 |
> |
sr.rorg[i] = oc[i] + (1.-d)*offsdir[i]; |
| 266 |
> |
/* check against source */ |
| 267 |
> |
if (srcray(&sr, NULL, sn) == 0.0) |
| 268 |
> |
continue; |
| 269 |
> |
sr.revf = srcvalue; |
| 270 |
> |
rayvalue(&sr); |
| 271 |
> |
if (bright(sr.rcol) <= FTINY) |
| 272 |
> |
continue; |
| 273 |
> |
nok++; |
| 274 |
> |
/* check against obstructions */ |
| 275 |
> |
srcray(&sr, NULL, sn); |
| 276 |
> |
rayvalue(&sr); |
| 277 |
> |
if (bright(sr.rcol) <= FTINY) |
| 278 |
> |
continue; |
| 279 |
> |
nhit++; |
| 280 |
|
} |
| 281 |
< |
a2 = .25*(2.*(r1s+r2s) - d2 - (r2s-r1s)*(r2s-r1s)/d2); |
| 282 |
< |
/* no overlap? */ |
| 283 |
< |
if (a2 <= 0.) |
| 284 |
< |
return(0.); |
| 285 |
< |
/* overlap, compute center */ |
| 286 |
< |
l = sqrt((r1s - a2)/d2); |
| 308 |
< |
for (i = 0; i < 3; i++) |
| 309 |
< |
cc[i] = c1[i] + l*disp[i]; |
| 310 |
< |
return(a2); |
| 281 |
> |
/* interpret results */ |
| 282 |
> |
if (nhit == 0) |
| 283 |
> |
return(f | SSKIP); /* 0% hit rate: totally occluded */ |
| 284 |
> |
if (nhit == nok) |
| 285 |
> |
return(f & ~SFOLLOW); /* 100% hit rate: no occlusion */ |
| 286 |
> |
return(f); /* no comment */ |
| 287 |
|
} |
| 288 |
< |
|
| 288 |
> |
|
| 289 |
|
|
| 290 |
|
#ifdef DEBUG |
| 291 |
|
virtverb(sn, fp) /* print verbose description of virtual source */ |
