| 121 |
|
|
| 122 |
|
int do_irrad = 0; /* compute irradiance? */ |
| 123 |
|
|
| 124 |
< |
int rand_samp = 0; /* pure Monte Carlo sampling? */ |
| 124 |
> |
int rand_samp = 1; /* pure Monte Carlo sampling? */ |
| 125 |
|
|
| 126 |
|
double dstrsrc = 0.0; /* square source distribution */ |
| 127 |
|
double shadthresh = .03; /* shadow threshold */ |
| 141 |
|
|
| 142 |
|
int backvis = 1; /* back face visibility */ |
| 143 |
|
|
| 144 |
< |
int maxdepth = 8; /* maximum recursion depth */ |
| 145 |
< |
double minweight = 5e-4; /* minimum ray weight */ |
| 144 |
> |
int maxdepth = -10; /* maximum recursion depth */ |
| 145 |
> |
double minweight = 2e-3; /* minimum ray weight */ |
| 146 |
|
|
| 147 |
|
char *ambfile = NULL; /* ambient file name */ |
| 148 |
|
COLOR ambval = BLKCOLOR; /* ambient value */ |
| 156 |
|
int ambincl = -1; /* include == 1, exclude == 0 */ |
| 157 |
|
|
| 158 |
|
|
| 159 |
+ |
static void |
| 160 |
+ |
reset_random(void) /* re-initialize random number generator */ |
| 161 |
+ |
{ |
| 162 |
+ |
if (rand_samp) { |
| 163 |
+ |
srandom((long)time(0)); |
| 164 |
+ |
initurand(0); |
| 165 |
+ |
} else { |
| 166 |
+ |
srandom(0L); |
| 167 |
+ |
initurand(2048); |
| 168 |
+ |
} |
| 169 |
+ |
} |
| 170 |
+ |
|
| 171 |
+ |
|
| 172 |
|
void |
| 173 |
|
ray_init( /* initialize ray-tracing calculation */ |
| 174 |
|
char *otnm |
| 180 |
|
if (ofun[OBJ_SPHERE].funp == o_default) |
| 181 |
|
initotypes(); |
| 182 |
|
/* initialize urand */ |
| 183 |
< |
if (rand_samp) { |
| 171 |
< |
srandom((long)time(0)); |
| 172 |
< |
initurand(0); |
| 173 |
< |
} else { |
| 174 |
< |
srandom(0L); |
| 175 |
< |
initurand(2048); |
| 176 |
< |
} |
| 183 |
> |
reset_random(); |
| 184 |
|
/* read scene octree */ |
| 185 |
|
readoct(octname = otnm, ~(IO_FILES|IO_INFO), &thescene, NULL); |
| 186 |
|
nsceneobjs = nobjects; |
| 193 |
|
/* ready to go... (almost) */ |
| 194 |
|
} |
| 195 |
|
|
| 196 |
+ |
|
| 197 |
|
void |
| 198 |
|
ray_trace( /* trace a primary ray */ |
| 199 |
|
RAY *r |
| 246 |
|
if (rp == NULL) |
| 247 |
|
return; |
| 248 |
|
rp->do_irrad = do_irrad; |
| 249 |
+ |
rp->rand_samp = rand_samp; |
| 250 |
|
rp->dstrsrc = dstrsrc; |
| 251 |
|
rp->shadthresh = shadthresh; |
| 252 |
|
rp->shadcert = shadcert; |
| 263 |
|
rp->backvis = backvis; |
| 264 |
|
rp->maxdepth = maxdepth; |
| 265 |
|
rp->minweight = minweight; |
| 257 |
– |
copycolor(rp->ambval, ambval); |
| 258 |
– |
memset(rp->ambfile, '\0', sizeof(rp->ambfile)); |
| 266 |
|
if (ambfile != NULL) |
| 267 |
|
strncpy(rp->ambfile, ambfile, sizeof(rp->ambfile)-1); |
| 268 |
+ |
else |
| 269 |
+ |
memset(rp->ambfile, '\0', sizeof(rp->ambfile)); |
| 270 |
+ |
copycolor(rp->ambval, ambval); |
| 271 |
|
rp->ambvwt = ambvwt; |
| 272 |
|
rp->ambacc = ambacc; |
| 273 |
|
rp->ambres = ambres; |
| 282 |
|
if (ndx+len >= sizeof(rp->amblval)) |
| 283 |
|
break; |
| 284 |
|
strcpy(rp->amblval+ndx, amblist[i]); |
| 285 |
+ |
rp->amblndx[i] = ndx; |
| 286 |
|
ndx += len+1; |
| 287 |
|
} |
| 288 |
|
while (i <= AMBLLEN) |
| 298 |
|
RAYPARAMS *rp |
| 299 |
|
) |
| 300 |
|
{ |
| 301 |
< |
register int i; |
| 301 |
> |
int i; |
| 302 |
|
|
| 303 |
|
if (rp == NULL) { /* restore defaults */ |
| 304 |
|
RAYPARAMS dflt; |
| 308 |
|
} |
| 309 |
|
/* restore saved settings */ |
| 310 |
|
do_irrad = rp->do_irrad; |
| 311 |
+ |
if (!rand_samp != !rp->rand_samp) { |
| 312 |
+ |
rand_samp = rp->rand_samp; |
| 313 |
+ |
reset_random(); |
| 314 |
+ |
} |
| 315 |
|
dstrsrc = rp->dstrsrc; |
| 316 |
|
shadthresh = rp->shadthresh; |
| 317 |
|
shadcert = rp->shadcert; |
| 333 |
|
ambdiv = rp->ambdiv; |
| 334 |
|
ambssamp = rp->ambssamp; |
| 335 |
|
ambounce = rp->ambounce; |
| 336 |
+ |
/* a bit dangerous if not static */ |
| 337 |
|
for (i = 0; rp->amblndx[i] >= 0; i++) |
| 338 |
|
amblist[i] = rp->amblval + rp->amblndx[i]; |
| 339 |
|
while (i <= AMBLLEN) |
| 380 |
|
return; |
| 381 |
|
|
| 382 |
|
rp->do_irrad = 0; |
| 383 |
+ |
rp->rand_samp = 1; |
| 384 |
|
rp->dstrsrc = 0.0; |
| 385 |
|
rp->shadthresh = .03; |
| 386 |
|
rp->shadcert = .75; |
| 395 |
|
rp->specthresh = .15; |
| 396 |
|
rp->specjitter = 1.; |
| 397 |
|
rp->backvis = 1; |
| 398 |
< |
rp->maxdepth = 8; |
| 398 |
> |
rp->maxdepth = -10; |
| 399 |
|
rp->minweight = 2e-3; |
| 383 |
– |
setcolor(rp->ambval, 0., 0., 0.); |
| 400 |
|
memset(rp->ambfile, '\0', sizeof(rp->ambfile)); |
| 401 |
+ |
setcolor(rp->ambval, 0., 0., 0.); |
| 402 |
|
rp->ambvwt = 0; |
| 403 |
|
rp->ambres = 256; |
| 404 |
|
rp->ambacc = 0.15; |