| 19 |
|
|
| 20 |
|
#include "random.h" |
| 21 |
|
|
| 22 |
+ |
#define MINSAMPLES 5 /* minimum number of pretest samples */ |
| 23 |
+ |
#define STESTMAX 30 /* maximum seeks per sample */ |
| 24 |
|
|
| 25 |
+ |
|
| 26 |
|
double getdisk(); |
| 27 |
|
|
| 28 |
|
static OBJECT *vobject; /* virtual source objects */ |
| 161 |
|
return(-1); /* at source!! */ |
| 162 |
|
if (source[sn].sflags & SPROX && d > source[sn].sl.prox) |
| 163 |
|
return(-1); /* too far away */ |
| 161 |
– |
ourspot.siz = 2.*PI*(1. - d/sqrt(d*d+maxrad2)); |
| 164 |
|
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 |
|
if (source[sn].sflags & SSPOT) { |
| 170 |
|
copystruct(&theirspot, source[sn].sl.s); |
| 171 |
|
multv3(theirspot.aim, source[sn].sl.s->aim, pm); |
| 172 |
< |
d = ourspot.siz; |
| 173 |
< |
if (!commonspot(&ourspot, &theirspot, nsloc)) |
| 174 |
< |
return(-1); /* no overlap */ |
| 172 |
> |
if (nsflags & SSPOT) { |
| 173 |
> |
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) |
| 188 |
|
VCOPY(ocent, v); |
| 189 |
|
} |
| 190 |
|
} |
| 178 |
– |
ourspot.flen = theirspot.flen; |
| 191 |
|
} |
| 192 |
|
if (source[sn].sflags & SFLAT) { /* behind source? */ |
| 193 |
|
multv3(nsnorm, source[sn].snorm, pm); |
| 194 |
< |
if (checkspot(&ourspot, nsnorm) < 0) |
| 194 |
> |
if (!checkspot(&ourspot, nsnorm)) |
| 195 |
|
return(-1); |
| 196 |
|
} |
| 197 |
|
} |
| 207 |
|
if (nsflags & SFLAT) |
| 208 |
|
VCOPY(source[i].snorm, nsnorm); |
| 209 |
|
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 |
> |
} |
| 215 |
|
if (nsflags & SPROX) |
| 216 |
|
source[i].sl.prox = source[sn].sl.prox; |
| 217 |
|
source[i].sa.svnext = sn; |
| 268 |
|
double or, d; |
| 269 |
|
int infront; |
| 270 |
|
int ssn; |
| 271 |
< |
int nhit; |
| 271 |
> |
int nhit, nok; |
| 272 |
|
register int i, n; |
| 273 |
|
/* return if pretesting disabled */ |
| 274 |
|
if (vspretest <= 0) |
| 286 |
|
n = or2/DOT(offsdir,offsdir)*vspretest + .5; |
| 287 |
|
infront = DOT(onorm, offsdir) > 0.; |
| 288 |
|
} |
| 289 |
< |
if (n < 1) n = 1; |
| 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 |
|
/* sample */ |
| 295 |
|
or = sqrt(or2); |
| 296 |
< |
ssn = 25*n; |
| 297 |
< |
nhit = 0; |
| 296 |
> |
ssn = STESTMAX*n; |
| 297 |
> |
nhit = nok = 0; |
| 298 |
|
while (n-- > 0) { |
| 299 |
|
/* get sample point */ |
| 300 |
|
do { |
| 330 |
|
rayvalue(&sr); |
| 331 |
|
if (bright(sr.rcol) <= FTINY) |
| 332 |
|
continue; |
| 333 |
+ |
nok++; |
| 334 |
|
/* check against obstructions */ |
| 335 |
|
srcray(&sr, NULL, sn); |
| 336 |
|
rayvalue(&sr); |
| 337 |
< |
if (bright(sr.rcol) <= FTINY) { |
| 337 |
> |
if (bright(sr.rcol) > FTINY) |
| 338 |
> |
nhit++; |
| 339 |
> |
if (nhit > 0 && nhit < nok) { |
| 340 |
|
#ifdef DEBUG |
| 341 |
< |
fprintf(stderr, "\tfound an occlusion\n"); |
| 341 |
> |
fprintf(stderr, "\tpartially occluded\n"); |
| 342 |
|
#endif |
| 343 |
< |
return(f); /* need to shadow test */ |
| 343 |
> |
return(f); /* need to shadow test */ |
| 344 |
|
} |
| 328 |
– |
nhit++; |
| 345 |
|
} |
| 346 |
|
if (nhit == 0) { |
| 347 |
|
#ifdef DEBUG |
