| 20 |
|
#include "random.h" |
| 21 |
|
|
| 22 |
|
|
| 23 |
– |
#define DISKTFRAC 0.25 /* disk area pretest fraction */ |
| 24 |
– |
|
| 23 |
|
double getdisk(); |
| 24 |
|
|
| 25 |
|
static OBJECT *vobject; /* virtual source objects */ |
| 115 |
|
register int sn; |
| 116 |
|
MAT4 pm; |
| 117 |
|
{ |
| 118 |
< |
FVECT nsloc, nsnorm, ocent; |
| 119 |
< |
double maxrad2; |
| 118 |
> |
FVECT nsloc, nsnorm, ocent, v; |
| 119 |
> |
double maxrad2, d; |
| 120 |
|
int nsflags; |
| 123 |
– |
double d1; |
| 121 |
|
SPOT theirspot, ourspot; |
| 122 |
|
register int i; |
| 123 |
|
|
| 137 |
|
if (source[sn].sflags & SSPOT) { |
| 138 |
|
copystruct(&theirspot, source[sn].sl.s); |
| 139 |
|
multp3(theirspot.aim, source[sn].sl.s->aim, pm); |
| 140 |
+ |
d = ourspot.siz; |
| 141 |
|
if (!commonbeam(&ourspot, &theirspot, nsloc)) |
| 142 |
< |
return(-1); /* no overlap */ |
| 142 |
> |
return(-1); /* no overlap */ |
| 143 |
> |
if (ourspot.siz < d-FTINY) { /* it shrunk */ |
| 144 |
> |
d = beamdisk(v, op, &ourspot, nsloc); |
| 145 |
> |
if (d <= FTINY) |
| 146 |
> |
return(-1); |
| 147 |
> |
if (d < maxrad2) { |
| 148 |
> |
maxrad2 = d; |
| 149 |
> |
VCOPY(ocent, v); |
| 150 |
> |
} |
| 151 |
> |
} |
| 152 |
|
} |
| 153 |
|
} else { /* local source */ |
| 154 |
|
multp3(nsloc, source[sn].sloc, pm); |
| 155 |
|
for (i = 0; i < 3; i++) |
| 156 |
|
ourspot.aim[i] = ocent[i] - nsloc[i]; |
| 157 |
< |
if ((d1 = normalize(ourspot.aim)) == 0.) |
| 157 |
> |
if ((d = normalize(ourspot.aim)) == 0.) |
| 158 |
|
return(-1); /* at source!! */ |
| 159 |
< |
if (source[sn].sflags & SPROX && d1 > source[sn].sl.prox) |
| 159 |
> |
if (source[sn].sflags & SPROX && d > source[sn].sl.prox) |
| 160 |
|
return(-1); /* too far away */ |
| 161 |
< |
ourspot.siz = 2.*PI*(1. - d1/sqrt(d1*d1+maxrad2)); |
| 161 |
> |
ourspot.siz = 2.*PI*(1. - d/sqrt(d*d+maxrad2)); |
| 162 |
|
ourspot.flen = 0.; |
| 163 |
|
if (source[sn].sflags & SSPOT) { |
| 164 |
|
copystruct(&theirspot, source[sn].sl.s); |
| 165 |
|
multv3(theirspot.aim, source[sn].sl.s->aim, pm); |
| 166 |
+ |
d = ourspot.siz; |
| 167 |
|
if (!commonspot(&ourspot, &theirspot, nsloc)) |
| 168 |
|
return(-1); /* no overlap */ |
| 169 |
+ |
if (ourspot.siz < d-FTINY) { /* it shrunk */ |
| 170 |
+ |
d = spotdisk(v, op, &ourspot, nsloc); |
| 171 |
+ |
if (d <= FTINY) |
| 172 |
+ |
return(-1); |
| 173 |
+ |
if (d < maxrad2) { |
| 174 |
+ |
maxrad2 = d; |
| 175 |
+ |
VCOPY(ocent, v); |
| 176 |
+ |
} |
| 177 |
+ |
} |
| 178 |
|
ourspot.flen = theirspot.flen; |
| 179 |
|
} |
| 180 |
|
if (source[sn].sflags & SFLAT) { /* behind source? */ |
| 181 |
|
multv3(nsnorm, source[sn].snorm, pm); |
| 182 |
< |
if (checkspot(&ourspot, nsnorm) < 0) |
| 182 |
> |
if (!checkspot(&ourspot, nsnorm)) |
| 183 |
|
return(-1); |
| 184 |
|
} |
| 185 |
|
} |
| 217 |
|
double rad2, roffs, offs, d, rd, rdoto; |
| 218 |
|
FVECT rnrm, nrm; |
| 219 |
|
/* first, use object getdisk function */ |
| 220 |
< |
rad2 = (*sfun[op->otype].of->getdisk)(oc, op); |
| 220 |
> |
rad2 = getmaxdisk(oc, op); |
| 221 |
|
if (!(source[sn].sflags & SVIRTUAL)) |
| 222 |
|
return(rad2); /* all done for normal source */ |
| 223 |
|
/* check for correct side of relay surface */ |
| 224 |
< |
roffs = (*sfun[source[sn].so->otype].of->getpleq)(rnrm, source[sn].so); |
| 224 |
> |
roffs = getplaneq(rnrm, source[sn].so); |
| 225 |
|
rd = DOT(rnrm, source[sn].sloc); /* source projection */ |
| 226 |
|
if (!(source[sn].sflags & SDISTANT)) |
| 227 |
|
rd -= roffs; |
| 229 |
|
if ((d > 0.) ^ (rd > 0.)) |
| 230 |
|
return(rad2); /* OK if opposite sides */ |
| 231 |
|
if (d*d >= rad2) |
| 232 |
< |
return(.0); /* no relay is possible */ |
| 232 |
> |
return(0.); /* no relay is possible */ |
| 233 |
|
/* we need a closer look */ |
| 234 |
< |
offs = (*sfun[op->otype].of->getpleq)(nrm, op); |
| 234 |
> |
offs = getplaneq(nrm, op); |
| 235 |
|
rdoto = DOT(rnrm, nrm); |
| 236 |
|
if (d*d >= rad2*(1.-rdoto*rdoto)) |
| 237 |
|
return(0.); /* disk entirely on projection side */ |
| 252 |
|
FVECT onorm; |
| 253 |
|
FVECT offsdir; |
| 254 |
|
double or, d; |
| 255 |
< |
int nok, nhit; |
| 255 |
> |
int infront; |
| 256 |
> |
int ssn; |
| 257 |
> |
int nhit, nok; |
| 258 |
|
register int i, n; |
| 259 |
|
/* return if pretesting disabled */ |
| 260 |
|
if (vspretest <= 0) |
| 261 |
|
return(f); |
| 262 |
|
/* get surface normal */ |
| 263 |
< |
(*sfun[o->otype].of->getpleq)(onorm, o); |
| 263 |
> |
getplaneq(onorm, o); |
| 264 |
|
/* set number of rays to sample */ |
| 265 |
< |
if (source[sn].sflags & SDISTANT) |
| 265 |
> |
if (source[sn].sflags & SDISTANT) { |
| 266 |
|
n = (2./3.*PI*PI)*or2/(thescene.cusize*thescene.cusize)* |
| 267 |
|
vspretest + .5; |
| 268 |
< |
else |
| 269 |
< |
n = or2/dist2(oc,source[sn].sloc)*vspretest + .5; |
| 268 |
> |
infront = DOT(onorm, source[sn].sloc) > 0.; |
| 269 |
> |
} else { |
| 270 |
> |
for (i = 0; i < 3; i++) |
| 271 |
> |
offsdir[i] = source[sn].sloc[i] - oc[i]; |
| 272 |
> |
n = or2/DOT(offsdir,offsdir)*vspretest + .5; |
| 273 |
> |
infront = DOT(onorm, offsdir) > 0.; |
| 274 |
> |
} |
| 275 |
|
if (n < 1) n = 1; |
| 276 |
< |
/* limit tests to central region */ |
| 277 |
< |
or = DISKTFRAC*sqrt(or2); |
| 276 |
> |
#ifdef DEBUG |
| 277 |
> |
fprintf(stderr, "pretesting source %d in object %s with %d rays\n", |
| 278 |
> |
sn, o->oname, n); |
| 279 |
> |
#endif |
| 280 |
|
/* sample */ |
| 281 |
+ |
or = sqrt(or2); |
| 282 |
+ |
ssn = 25*n; |
| 283 |
|
nhit = nok = 0; |
| 284 |
|
while (n-- > 0) { |
| 285 |
< |
samplendx++; |
| 286 |
< |
/* |
| 287 |
< |
* We're being real sloppy with our sample locations here. |
| 288 |
< |
*/ |
| 289 |
< |
for (i = 0; i < 3; i++) |
| 290 |
< |
offsdir[i] = or*(1. - 2.*urand(931*i+5821+n)); |
| 291 |
< |
d = DOT(offsdir,onorm); |
| 292 |
< |
for (i = 0; i < 3; i++) |
| 293 |
< |
sr.rorg[i] = oc[i] + (1.-d)*offsdir[i]; |
| 285 |
> |
/* get sample point */ |
| 286 |
> |
do { |
| 287 |
> |
if (--ssn < 0) { |
| 288 |
> |
#ifdef DEBUG |
| 289 |
> |
fprintf(stderr, "\ttoo hard to hit\n"); |
| 290 |
> |
#endif |
| 291 |
> |
return(f); /* too small a target! */ |
| 292 |
> |
} |
| 293 |
> |
for (i = 0; i < 3; i++) |
| 294 |
> |
offsdir[i] = or*(1. - |
| 295 |
> |
2.*urand(931*i+5827+ssn)); |
| 296 |
> |
for (i = 0; i < 3; i++) |
| 297 |
> |
sr.rorg[i] = oc[i] + offsdir[i]; |
| 298 |
> |
d = DOT(offsdir,onorm); |
| 299 |
> |
if (infront) |
| 300 |
> |
for (i = 0; i < 3; i++) { |
| 301 |
> |
sr.rorg[i] -= (d-.0001)*onorm[i]; |
| 302 |
> |
sr.rdir[i] = -onorm[i]; |
| 303 |
> |
} |
| 304 |
> |
else |
| 305 |
> |
for (i = 0; i < 3; i++) { |
| 306 |
> |
sr.rorg[i] -= (d+.0001)*onorm[i]; |
| 307 |
> |
sr.rdir[i] = onorm[i]; |
| 308 |
> |
} |
| 309 |
> |
rayorigin(&sr, NULL, PRIMARY, 1.0); |
| 310 |
> |
} while (!(*ofun[o->otype].funp)(o, &sr)); |
| 311 |
|
/* check against source */ |
| 312 |
< |
if (srcray(&sr, NULL, sn) == 0.0) |
| 312 |
> |
samplendx++; |
| 313 |
> |
if (srcray(&sr, NULL, sn) == 0.) |
| 314 |
|
continue; |
| 315 |
|
sr.revf = srcvalue; |
| 316 |
|
rayvalue(&sr); |
| 320 |
|
/* check against obstructions */ |
| 321 |
|
srcray(&sr, NULL, sn); |
| 322 |
|
rayvalue(&sr); |
| 323 |
< |
if (bright(sr.rcol) <= FTINY) |
| 324 |
< |
continue; |
| 325 |
< |
nhit++; |
| 323 |
> |
if (bright(sr.rcol) > FTINY) |
| 324 |
> |
nhit++; |
| 325 |
> |
if (nhit > 0 && nhit < nok) { |
| 326 |
> |
#ifdef DEBUG |
| 327 |
> |
fprintf(stderr, "\tpartially occluded\n"); |
| 328 |
> |
#endif |
| 329 |
> |
return(f); /* need to shadow test */ |
| 330 |
> |
} |
| 331 |
|
} |
| 332 |
< |
/* interpret results */ |
| 333 |
< |
if (nhit == 0) |
| 332 |
> |
if (nhit == 0) { |
| 333 |
> |
#ifdef DEBUG |
| 334 |
> |
fprintf(stderr, "\t0%% hit rate\n"); |
| 335 |
> |
#endif |
| 336 |
|
return(f | SSKIP); /* 0% hit rate: totally occluded */ |
| 337 |
< |
if (nhit == nok) |
| 338 |
< |
return(f & ~SFOLLOW); /* 100% hit rate: no occlusion */ |
| 339 |
< |
return(f); /* no comment */ |
| 337 |
> |
} |
| 338 |
> |
#ifdef DEBUG |
| 339 |
> |
fprintf(stderr, "\t100%% hit rate\n"); |
| 340 |
> |
#endif |
| 341 |
> |
return(f & ~SFOLLOW); /* 100% hit rate: no occlusion */ |
| 342 |
|
} |
| 343 |
|
|
| 344 |
|
|
