| 19 |
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| 20 |
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#include "random.h" |
| 21 |
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|
| 22 |
+ |
#define MINSAMPLES 5 /* minimum number of pretest samples */ |
| 23 |
+ |
#define STESTMAX 30 /* maximum seeks per sample */ |
| 24 |
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| 23 |
– |
#define DISKTFRAC 0.25 /* disk area pretest fraction */ |
| 25 |
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| 26 |
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double getdisk(); |
| 27 |
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| 118 |
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register int sn; |
| 119 |
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MAT4 pm; |
| 120 |
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{ |
| 121 |
< |
FVECT nsloc, nsnorm, ocent; |
| 122 |
< |
double maxrad2; |
| 121 |
> |
FVECT nsloc, nsnorm, ocent, v; |
| 122 |
> |
double maxrad2, d; |
| 123 |
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int nsflags; |
| 123 |
– |
double d1; |
| 124 |
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SPOT theirspot, ourspot; |
| 125 |
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register int i; |
| 126 |
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|
| 140 |
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if (source[sn].sflags & SSPOT) { |
| 141 |
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copystruct(&theirspot, source[sn].sl.s); |
| 142 |
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multp3(theirspot.aim, source[sn].sl.s->aim, pm); |
| 143 |
+ |
d = ourspot.siz; |
| 144 |
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if (!commonbeam(&ourspot, &theirspot, nsloc)) |
| 145 |
< |
return(-1); /* no overlap */ |
| 145 |
> |
return(-1); /* no overlap */ |
| 146 |
> |
if (ourspot.siz < d-FTINY) { /* it shrunk */ |
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> |
d = beamdisk(v, op, &ourspot, nsloc); |
| 148 |
> |
if (d <= FTINY) |
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> |
return(-1); |
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> |
if (d < maxrad2) { |
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> |
maxrad2 = d; |
| 152 |
> |
VCOPY(ocent, v); |
| 153 |
> |
} |
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> |
} |
| 155 |
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} |
| 156 |
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} else { /* local source */ |
| 157 |
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multp3(nsloc, source[sn].sloc, pm); |
| 158 |
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for (i = 0; i < 3; i++) |
| 159 |
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ourspot.aim[i] = ocent[i] - nsloc[i]; |
| 160 |
< |
if ((d1 = normalize(ourspot.aim)) == 0.) |
| 160 |
> |
if ((d = normalize(ourspot.aim)) == 0.) |
| 161 |
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return(-1); /* at source!! */ |
| 162 |
< |
if (source[sn].sflags & SPROX && d1 > source[sn].sl.prox) |
| 162 |
> |
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)); |
| 164 |
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ourspot.flen = 0.; |
| 165 |
+ |
if (d*d > maxrad2) |
| 166 |
+ |
ourspot.siz = 2.*PI*(1. - sqrt(1.-maxrad2/(d*d))); |
| 167 |
+ |
else |
| 168 |
+ |
nsflags &= ~SSPOT; |
| 169 |
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if (source[sn].sflags & SSPOT) { |
| 170 |
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copystruct(&theirspot, source[sn].sl.s); |
| 171 |
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multv3(theirspot.aim, source[sn].sl.s->aim, pm); |
| 172 |
< |
if (!commonspot(&ourspot, &theirspot, nsloc)) |
| 173 |
< |
return(-1); /* no overlap */ |
| 174 |
< |
ourspot.flen = theirspot.flen; |
| 172 |
> |
if (nsflags & SSPOT) { |
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> |
ourspot.flen = theirspot.flen; |
| 174 |
> |
d = ourspot.siz; |
| 175 |
> |
if (!commonspot(&ourspot, &theirspot, nsloc)) |
| 176 |
> |
return(-1); /* no overlap */ |
| 177 |
> |
} else { |
| 178 |
> |
nsflags |= SSPOT; |
| 179 |
> |
copystruct(&ourspot, &theirspot); |
| 180 |
> |
d = 2.*ourspot.siz; |
| 181 |
> |
} |
| 182 |
> |
if (ourspot.siz < d-FTINY) { /* it shrunk */ |
| 183 |
> |
d = spotdisk(v, op, &ourspot, nsloc); |
| 184 |
> |
if (d <= FTINY) |
| 185 |
> |
return(-1); |
| 186 |
> |
if (d < maxrad2) { |
| 187 |
> |
maxrad2 = d; |
| 188 |
> |
VCOPY(ocent, v); |
| 189 |
> |
} |
| 190 |
> |
} |
| 191 |
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} |
| 192 |
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if (source[sn].sflags & SFLAT) { /* behind source? */ |
| 193 |
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multv3(nsnorm, source[sn].snorm, pm); |
| 194 |
< |
if (checkspot(&ourspot, nsnorm) < 0) |
| 194 |
> |
if (!checkspot(&ourspot, nsnorm)) |
| 195 |
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return(-1); |
| 196 |
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} |
| 197 |
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} |
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if (nsflags & SFLAT) |
| 208 |
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VCOPY(source[i].snorm, nsnorm); |
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source[i].ss = source[sn].ss; source[i].ss2 = source[sn].ss2; |
| 210 |
< |
if ((source[i].sl.s = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
| 211 |
< |
goto memerr; |
| 212 |
< |
copystruct(source[i].sl.s, &ourspot); |
| 210 |
> |
if (nsflags & SSPOT) { |
| 211 |
> |
if ((source[i].sl.s = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
| 212 |
> |
goto memerr; |
| 213 |
> |
copystruct(source[i].sl.s, &ourspot); |
| 214 |
> |
} |
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if (nsflags & SPROX) |
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source[i].sl.prox = source[sn].sl.prox; |
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source[i].sa.svnext = sn; |
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double rad2, roffs, offs, d, rd, rdoto; |
| 232 |
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FVECT rnrm, nrm; |
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/* first, use object getdisk function */ |
| 234 |
< |
rad2 = (*sfun[op->otype].of->getdisk)(oc, op); |
| 234 |
> |
rad2 = getmaxdisk(oc, op); |
| 235 |
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if (!(source[sn].sflags & SVIRTUAL)) |
| 236 |
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return(rad2); /* all done for normal source */ |
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/* check for correct side of relay surface */ |
| 238 |
< |
roffs = (*sfun[source[sn].so->otype].of->getpleq)(rnrm, source[sn].so); |
| 238 |
> |
roffs = getplaneq(rnrm, source[sn].so); |
| 239 |
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rd = DOT(rnrm, source[sn].sloc); /* source projection */ |
| 240 |
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if (!(source[sn].sflags & SDISTANT)) |
| 241 |
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rd -= roffs; |
| 243 |
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if ((d > 0.) ^ (rd > 0.)) |
| 244 |
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return(rad2); /* OK if opposite sides */ |
| 245 |
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if (d*d >= rad2) |
| 246 |
< |
return(.0); /* no relay is possible */ |
| 246 |
> |
return(0.); /* no relay is possible */ |
| 247 |
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/* we need a closer look */ |
| 248 |
< |
offs = (*sfun[op->otype].of->getpleq)(nrm, op); |
| 248 |
> |
offs = getplaneq(nrm, op); |
| 249 |
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rdoto = DOT(rnrm, nrm); |
| 250 |
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if (d*d >= rad2*(1.-rdoto*rdoto)) |
| 251 |
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return(0.); /* disk entirely on projection side */ |
| 266 |
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FVECT onorm; |
| 267 |
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FVECT offsdir; |
| 268 |
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double or, d; |
| 269 |
< |
int nok, nhit; |
| 269 |
> |
int infront; |
| 270 |
> |
int ssn; |
| 271 |
> |
int nhit, nok; |
| 272 |
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register int i, n; |
| 273 |
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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 */ |
| 277 |
< |
(*sfun[o->otype].of->getpleq)(onorm, o); |
| 277 |
> |
getplaneq(onorm, o); |
| 278 |
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/* set number of rays to sample */ |
| 279 |
< |
if (source[sn].sflags & SDISTANT) |
| 279 |
> |
if (source[sn].sflags & SDISTANT) { |
| 280 |
|
n = (2./3.*PI*PI)*or2/(thescene.cusize*thescene.cusize)* |
| 281 |
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vspretest + .5; |
| 282 |
< |
else |
| 283 |
< |
n = or2/dist2(oc,source[sn].sloc)*vspretest + .5; |
| 284 |
< |
if (n < 1) n = 1; |
| 285 |
< |
/* limit tests to central region */ |
| 286 |
< |
or = DISKTFRAC*sqrt(or2); |
| 282 |
> |
infront = DOT(onorm, source[sn].sloc) > 0.; |
| 283 |
> |
} else { |
| 284 |
> |
for (i = 0; i < 3; i++) |
| 285 |
> |
offsdir[i] = source[sn].sloc[i] - oc[i]; |
| 286 |
> |
n = or2/DOT(offsdir,offsdir)*vspretest + .5; |
| 287 |
> |
infront = DOT(onorm, offsdir) > 0.; |
| 288 |
> |
} |
| 289 |
> |
if (n < MINSAMPLES) n = MINSAMPLES; |
| 290 |
> |
#ifdef DEBUG |
| 291 |
> |
fprintf(stderr, "pretesting source %d in object %s with %d rays\n", |
| 292 |
> |
sn, o->oname, n); |
| 293 |
> |
#endif |
| 294 |
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/* sample */ |
| 295 |
+ |
or = sqrt(or2); |
| 296 |
+ |
ssn = STESTMAX*n; |
| 297 |
|
nhit = nok = 0; |
| 298 |
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while (n-- > 0) { |
| 299 |
< |
samplendx++; |
| 300 |
< |
/* |
| 301 |
< |
* We're being real sloppy with our sample locations here. |
| 302 |
< |
*/ |
| 303 |
< |
for (i = 0; i < 3; i++) |
| 304 |
< |
offsdir[i] = or*(1. - 2.*urand(931*i+5821+n)); |
| 305 |
< |
d = DOT(offsdir,onorm); |
| 306 |
< |
for (i = 0; i < 3; i++) |
| 307 |
< |
sr.rorg[i] = oc[i] + (1.-d)*offsdir[i]; |
| 299 |
> |
/* get sample point */ |
| 300 |
> |
do { |
| 301 |
> |
if (--ssn < 0) { |
| 302 |
> |
#ifdef DEBUG |
| 303 |
> |
fprintf(stderr, "\ttoo hard to hit\n"); |
| 304 |
> |
#endif |
| 305 |
> |
return(f); /* too small a target! */ |
| 306 |
> |
} |
| 307 |
> |
for (i = 0; i < 3; i++) |
| 308 |
> |
offsdir[i] = or*(1. - |
| 309 |
> |
2.*urand(931*i+5827+ssn)); |
| 310 |
> |
for (i = 0; i < 3; i++) |
| 311 |
> |
sr.rorg[i] = oc[i] + offsdir[i]; |
| 312 |
> |
d = DOT(offsdir,onorm); |
| 313 |
> |
if (infront) |
| 314 |
> |
for (i = 0; i < 3; i++) { |
| 315 |
> |
sr.rorg[i] -= (d-.0001)*onorm[i]; |
| 316 |
> |
sr.rdir[i] = -onorm[i]; |
| 317 |
> |
} |
| 318 |
> |
else |
| 319 |
> |
for (i = 0; i < 3; i++) { |
| 320 |
> |
sr.rorg[i] -= (d+.0001)*onorm[i]; |
| 321 |
> |
sr.rdir[i] = onorm[i]; |
| 322 |
> |
} |
| 323 |
> |
rayorigin(&sr, NULL, PRIMARY, 1.0); |
| 324 |
> |
} while (!(*ofun[o->otype].funp)(o, &sr)); |
| 325 |
|
/* check against source */ |
| 326 |
< |
if (srcray(&sr, NULL, sn) == 0.0) |
| 326 |
> |
samplendx++; |
| 327 |
> |
if (srcray(&sr, NULL, sn) == 0.) |
| 328 |
|
continue; |
| 329 |
|
sr.revf = srcvalue; |
| 330 |
|
rayvalue(&sr); |
| 334 |
|
/* check against obstructions */ |
| 335 |
|
srcray(&sr, NULL, sn); |
| 336 |
|
rayvalue(&sr); |
| 337 |
< |
if (bright(sr.rcol) <= FTINY) |
| 338 |
< |
continue; |
| 339 |
< |
nhit++; |
| 337 |
> |
if (bright(sr.rcol) > FTINY) |
| 338 |
> |
nhit++; |
| 339 |
> |
if (nhit > 0 && nhit < nok) { |
| 340 |
> |
#ifdef DEBUG |
| 341 |
> |
fprintf(stderr, "\tpartially occluded\n"); |
| 342 |
> |
#endif |
| 343 |
> |
return(f); /* need to shadow test */ |
| 344 |
> |
} |
| 345 |
|
} |
| 346 |
< |
/* interpret results */ |
| 347 |
< |
if (nhit == 0) |
| 346 |
> |
if (nhit == 0) { |
| 347 |
> |
#ifdef DEBUG |
| 348 |
> |
fprintf(stderr, "\t0%% hit rate\n"); |
| 349 |
> |
#endif |
| 350 |
|
return(f | SSKIP); /* 0% hit rate: totally occluded */ |
| 351 |
< |
if (nhit == nok) |
| 352 |
< |
return(f & ~SFOLLOW); /* 100% hit rate: no occlusion */ |
| 353 |
< |
return(f); /* no comment */ |
| 351 |
> |
} |
| 352 |
> |
#ifdef DEBUG |
| 353 |
> |
fprintf(stderr, "\t100%% hit rate\n"); |
| 354 |
> |
#endif |
| 355 |
> |
return(f & ~SFOLLOW); /* 100% hit rate: no occlusion */ |
| 356 |
|
} |
| 357 |
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| 358 |
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