| 19 |
|
|
| 20 |
|
#include "random.h" |
| 21 |
|
|
| 22 |
+ |
#define MINSAMPLES 3 /* 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 */ |
| 182 |
|
} |
| 183 |
|
if (source[sn].sflags & SFLAT) { /* behind source? */ |
| 184 |
|
multv3(nsnorm, source[sn].snorm, pm); |
| 185 |
< |
if (checkspot(&ourspot, nsnorm) < 0) |
| 185 |
> |
if (!checkspot(&ourspot, nsnorm)) |
| 186 |
|
return(-1); |
| 187 |
|
} |
| 188 |
|
} |
| 257 |
|
double or, d; |
| 258 |
|
int infront; |
| 259 |
|
int ssn; |
| 260 |
< |
int nhit; |
| 260 |
> |
int nhit, nok; |
| 261 |
|
register int i, n; |
| 262 |
|
/* return if pretesting disabled */ |
| 263 |
|
if (vspretest <= 0) |
| 275 |
|
n = or2/DOT(offsdir,offsdir)*vspretest + .5; |
| 276 |
|
infront = DOT(onorm, offsdir) > 0.; |
| 277 |
|
} |
| 278 |
< |
if (n < 1) n = 1; |
| 278 |
> |
if (n < MINSAMPLES) n = MINSAMPLES; |
| 279 |
|
#ifdef DEBUG |
| 280 |
|
fprintf(stderr, "pretesting source %d in object %s with %d rays\n", |
| 281 |
|
sn, o->oname, n); |
| 282 |
|
#endif |
| 283 |
|
/* sample */ |
| 284 |
|
or = sqrt(or2); |
| 285 |
< |
ssn = 25*n; |
| 286 |
< |
nhit = 0; |
| 285 |
> |
ssn = STESTMAX*n; |
| 286 |
> |
nhit = nok = 0; |
| 287 |
|
while (n-- > 0) { |
| 288 |
|
/* get sample point */ |
| 289 |
|
do { |
| 319 |
|
rayvalue(&sr); |
| 320 |
|
if (bright(sr.rcol) <= FTINY) |
| 321 |
|
continue; |
| 322 |
+ |
nok++; |
| 323 |
|
/* check against obstructions */ |
| 324 |
|
srcray(&sr, NULL, sn); |
| 325 |
|
rayvalue(&sr); |
| 326 |
< |
if (bright(sr.rcol) <= FTINY) { |
| 326 |
> |
if (bright(sr.rcol) > FTINY) |
| 327 |
> |
nhit++; |
| 328 |
> |
if (nhit > 0 && nhit < nok) { |
| 329 |
|
#ifdef DEBUG |
| 330 |
< |
fprintf(stderr, "\tfound an occlusion\n"); |
| 330 |
> |
fprintf(stderr, "\tpartially occluded\n"); |
| 331 |
|
#endif |
| 332 |
< |
return(f); /* need to shadow test */ |
| 332 |
> |
return(f); /* need to shadow test */ |
| 333 |
|
} |
| 328 |
– |
nhit++; |
| 334 |
|
} |
| 335 |
|
if (nhit == 0) { |
| 336 |
|
#ifdef DEBUG |
