| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: pmapdata.c,v 2.21 2019/05/10 17:43:22 rschregle Exp $"; |
| 3 |
#endif |
| 4 |
|
| 5 |
/* |
| 6 |
========================================================================= |
| 7 |
Photon map types and interface to nearest neighbour lookups in underlying |
| 8 |
point cloud data structure. |
| 9 |
|
| 10 |
The default data structure is an in-core kd-tree (see pmapkdt.{h,c}). |
| 11 |
This can be overriden with the PMAP_OOC compiletime switch, which enables |
| 12 |
an out-of-core octree (see oococt.{h,c}). |
| 13 |
|
| 14 |
Roland Schregle (roland.schregle@{hslu.ch, gmail.com}) |
| 15 |
(c) Fraunhofer Institute for Solar Energy Systems, |
| 16 |
(c) Lucerne University of Applied Sciences and Arts, |
| 17 |
supported by the Swiss National Science Foundation (SNSF, #147053) |
| 18 |
========================================================================== |
| 19 |
|
| 20 |
$Id: pmapdata.c,v 2.21 2019/05/10 17:43:22 rschregle Exp $ |
| 21 |
*/ |
| 22 |
|
| 23 |
|
| 24 |
|
| 25 |
#include "pmapdata.h" |
| 26 |
#include "pmaprand.h" |
| 27 |
#include "pmapmat.h" |
| 28 |
#include "otypes.h" |
| 29 |
#include "source.h" |
| 30 |
#include "rcontrib.h" |
| 31 |
#include "random.h" |
| 32 |
|
| 33 |
|
| 34 |
|
| 35 |
PhotonMap *photonMaps [NUM_PMAP_TYPES] = { |
| 36 |
NULL, NULL, NULL, NULL, NULL, NULL |
| 37 |
}; |
| 38 |
|
| 39 |
|
| 40 |
|
| 41 |
/* Include routines to handle underlying point cloud data structure */ |
| 42 |
#ifdef PMAP_OOC |
| 43 |
#include "pmapooc.c" |
| 44 |
#else |
| 45 |
#include "pmapkdt.c" |
| 46 |
#endif |
| 47 |
|
| 48 |
/* Ambient include/exclude set (from ambient.c) */ |
| 49 |
#ifndef MAXASET |
| 50 |
#define MAXASET 4095 |
| 51 |
#endif |
| 52 |
extern OBJECT ambset [MAXASET+1]; |
| 53 |
|
| 54 |
/* Callback to print photon attributes acc. to user defined format */ |
| 55 |
int (*printPhoton)(RAY *r, Photon *p, PhotonMap *pm); |
| 56 |
|
| 57 |
|
| 58 |
|
| 59 |
void initPhotonMap (PhotonMap *pmap, PhotonMapType t) |
| 60 |
/* Init photon map 'n' stuff... */ |
| 61 |
{ |
| 62 |
if (!pmap) |
| 63 |
return; |
| 64 |
|
| 65 |
pmap -> numPhotons = 0; |
| 66 |
pmap -> biasCompHist = NULL; |
| 67 |
pmap -> maxPos [0] = pmap -> maxPos [1] = pmap -> maxPos [2] = -FHUGE; |
| 68 |
pmap -> minPos [0] = pmap -> minPos [1] = pmap -> minPos [2] = FHUGE; |
| 69 |
pmap -> minGathered = pmap -> maxGathered = pmap -> totalGathered = 0; |
| 70 |
pmap -> gatherTolerance = gatherTolerance; |
| 71 |
pmap -> minError = pmap -> maxError = pmap -> rmsError = 0; |
| 72 |
pmap -> numDensity = 0; |
| 73 |
pmap -> distribRatio = 1; |
| 74 |
pmap -> type = t; |
| 75 |
pmap -> squeue.node = NULL; |
| 76 |
pmap -> squeue.len = 0; |
| 77 |
|
| 78 |
/* Init local RNG state */ |
| 79 |
pmap -> randState [0] = 10243; |
| 80 |
pmap -> randState [1] = 39829; |
| 81 |
pmap -> randState [2] = 9433; |
| 82 |
pmapSeed(randSeed, pmap -> randState); |
| 83 |
|
| 84 |
/* Set up type-specific photon lookup callback */ |
| 85 |
pmap -> lookup = pmapLookup [t]; |
| 86 |
|
| 87 |
/* Mark primary photon ray as unused */ |
| 88 |
pmap -> lastPrimary.srcIdx = -1; |
| 89 |
pmap -> numPrimary = 0; |
| 90 |
pmap -> primaries = NULL; |
| 91 |
|
| 92 |
/* Init storage */ |
| 93 |
pmap -> heap = NULL; |
| 94 |
pmap -> heapBuf = NULL; |
| 95 |
pmap -> heapBufLen = 0; |
| 96 |
#ifdef PMAP_OOC |
| 97 |
OOC_Null(&pmap -> store); |
| 98 |
#else |
| 99 |
kdT_Null(&pmap -> store); |
| 100 |
#endif |
| 101 |
} |
| 102 |
|
| 103 |
|
| 104 |
|
| 105 |
void initPhotonHeap (PhotonMap *pmap) |
| 106 |
{ |
| 107 |
int fdFlags; |
| 108 |
|
| 109 |
if (!pmap) |
| 110 |
error(INTERNAL, "undefined photon map in initPhotonHeap"); |
| 111 |
|
| 112 |
if (!pmap -> heap) { |
| 113 |
/* Open heap file */ |
| 114 |
mktemp(strcpy(pmap -> heapFname, PMAP_TMPFNAME)); |
| 115 |
if (!(pmap -> heap = fopen(pmap -> heapFname, "w+b"))) |
| 116 |
error(SYSTEM, "failed opening heap file in initPhotonHeap"); |
| 117 |
|
| 118 |
#ifdef F_SETFL /* XXX is there an alternate needed for Windows? */ |
| 119 |
fdFlags = fcntl(fileno(pmap -> heap), F_GETFL); |
| 120 |
fcntl(fileno(pmap -> heap), F_SETFL, fdFlags | O_APPEND); |
| 121 |
#endif/* ftruncate(fileno(pmap -> heap), 0); */ |
| 122 |
} |
| 123 |
} |
| 124 |
|
| 125 |
|
| 126 |
|
| 127 |
void flushPhotonHeap (PhotonMap *pmap) |
| 128 |
{ |
| 129 |
int fd; |
| 130 |
const unsigned long len = pmap -> heapBufLen * sizeof(Photon); |
| 131 |
|
| 132 |
if (!pmap) |
| 133 |
error(INTERNAL, "undefined photon map in flushPhotonHeap"); |
| 134 |
|
| 135 |
if (!pmap -> heap || !pmap -> heapBuf) { |
| 136 |
/* Silently ignore undefined heap |
| 137 |
error(INTERNAL, "undefined heap in flushPhotonHeap"); */ |
| 138 |
return; |
| 139 |
} |
| 140 |
|
| 141 |
/* Atomically seek and write block to heap */ |
| 142 |
/* !!! Unbuffered I/O via pwrite() avoids potential race conditions |
| 143 |
* !!! and buffer corruption which can occur with lseek()/fseek() |
| 144 |
* !!! followed by write()/fwrite(). */ |
| 145 |
fd = fileno(pmap -> heap); |
| 146 |
|
| 147 |
#ifdef DEBUG_PMAP |
| 148 |
sprintf(errmsg, "Proc %d: flushing %ld photons from pos %ld\n", getpid(), |
| 149 |
pmap -> heapBufLen, lseek(fd, 0, SEEK_END) / sizeof(Photon)); |
| 150 |
eputs(errmsg); |
| 151 |
#endif |
| 152 |
|
| 153 |
/*if (pwrite(fd, pmap -> heapBuf, len, lseek(fd, 0, SEEK_END)) != len) */ |
| 154 |
if (write(fd, pmap -> heapBuf, len) != len) |
| 155 |
error(SYSTEM, "failed append to heap file in flushPhotonHeap"); |
| 156 |
|
| 157 |
#if NIX |
| 158 |
if (fsync(fd)) |
| 159 |
error(SYSTEM, "failed fsync in flushPhotonHeap"); |
| 160 |
#endif |
| 161 |
|
| 162 |
pmap -> heapBufLen = 0; |
| 163 |
} |
| 164 |
|
| 165 |
|
| 166 |
|
| 167 |
#ifdef DEBUG_PMAP |
| 168 |
static int checkPhotonHeap (FILE *file) |
| 169 |
/* Check heap for nonsensical or duplicate photons */ |
| 170 |
{ |
| 171 |
Photon p, lastp; |
| 172 |
int i, dup; |
| 173 |
|
| 174 |
rewind(file); |
| 175 |
memset(&lastp, 0, sizeof(lastp)); |
| 176 |
|
| 177 |
while (fread(&p, sizeof(p), 1, file)) { |
| 178 |
dup = 1; |
| 179 |
|
| 180 |
for (i = 0; i <= 2; i++) { |
| 181 |
if (p.pos [i] < thescene.cuorg [i] || |
| 182 |
p.pos [i] > thescene.cuorg [i] + thescene.cusize) { |
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|
| 184 |
sprintf(errmsg, "corrupt photon in heap at [%f, %f, %f]\n", |
| 185 |
p.pos [0], p.pos [1], p.pos [2]); |
| 186 |
error(WARNING, errmsg); |
| 187 |
} |
| 188 |
|
| 189 |
dup &= p.pos [i] == lastp.pos [i]; |
| 190 |
} |
| 191 |
|
| 192 |
if (dup) { |
| 193 |
sprintf(errmsg, |
| 194 |
"consecutive duplicate photon in heap at [%f, %f, %f]\n", |
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p.pos [0], p.pos [1], p.pos [2]); |
| 196 |
error(WARNING, errmsg); |
| 197 |
} |
| 198 |
} |
| 199 |
|
| 200 |
return 0; |
| 201 |
} |
| 202 |
#endif |
| 203 |
|
| 204 |
|
| 205 |
|
| 206 |
int newPhoton (PhotonMap* pmap, const RAY* ray) |
| 207 |
{ |
| 208 |
unsigned i; |
| 209 |
Photon photon; |
| 210 |
COLOR photonFlux; |
| 211 |
|
| 212 |
/* Account for distribution ratio */ |
| 213 |
if (!pmap || pmapRandom(pmap -> randState) > pmap -> distribRatio) |
| 214 |
return -1; |
| 215 |
|
| 216 |
/* Don't store on sources */ |
| 217 |
if (ray -> robj > -1 && islight(objptr(ray -> ro -> omod) -> otype)) |
| 218 |
return -1; |
| 219 |
|
| 220 |
/* Ignore photon if modifier in/outside exclude/include set */ |
| 221 |
if (ambincl != -1 && ray -> ro && |
| 222 |
ambincl != inset(ambset, ray -> ro -> omod)) |
| 223 |
return -1; |
| 224 |
|
| 225 |
if (pmapNumROI && pmapROI) { |
| 226 |
unsigned inROI = 0; |
| 227 |
|
| 228 |
/* Store photon if within a region of interest (for ze Ecksperts!) */ |
| 229 |
for (i = 0; !inROI && i < pmapNumROI; i++) |
| 230 |
inROI = (ray -> rop [0] >= pmapROI [i].min [0] && |
| 231 |
ray -> rop [0] <= pmapROI [i].max [0] && |
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ray -> rop [1] >= pmapROI [i].min [1] && |
| 233 |
ray -> rop [1] <= pmapROI [i].max [1] && |
| 234 |
ray -> rop [2] >= pmapROI [i].min [2] && |
| 235 |
ray -> rop [2] <= pmapROI [i].max [2]); |
| 236 |
if (!inROI) |
| 237 |
return -1; |
| 238 |
} |
| 239 |
|
| 240 |
/* Adjust flux according to distribution ratio and ray weight */ |
| 241 |
copycolor(photonFlux, ray -> rcol); |
| 242 |
#if 0 |
| 243 |
/* Factored out ray -> rweight as deprecated (?) for pmap, and infact |
| 244 |
erroneously attenuates volume photon flux based on extinction, |
| 245 |
which is already factored in by photonParticipate() */ |
| 246 |
scalecolor(photonFlux, |
| 247 |
ray -> rweight / (pmap -> distribRatio ? pmap -> distribRatio |
| 248 |
: 1)); |
| 249 |
#else |
| 250 |
scalecolor(photonFlux, |
| 251 |
1.0 / (pmap -> distribRatio ? pmap -> distribRatio : 1)); |
| 252 |
#endif |
| 253 |
setPhotonFlux(&photon, photonFlux); |
| 254 |
|
| 255 |
/* Set photon position and flags */ |
| 256 |
VCOPY(photon.pos, ray -> rop); |
| 257 |
photon.flags = 0; |
| 258 |
photon.caustic = PMAP_CAUSTICRAY(ray); |
| 259 |
|
| 260 |
/* Set contrib photon's primary ray and subprocess index (the latter |
| 261 |
* to linearise the primary ray indices after photon distribution is |
| 262 |
* complete). Also set primary ray's source index, thereby marking it |
| 263 |
* as used. */ |
| 264 |
if (isContribPmap(pmap)) { |
| 265 |
photon.primary = pmap -> numPrimary; |
| 266 |
photon.proc = PMAP_GETRAYPROC(ray); |
| 267 |
pmap -> lastPrimary.srcIdx = ray -> rsrc; |
| 268 |
} |
| 269 |
else photon.primary = 0; |
| 270 |
|
| 271 |
/* Set normal */ |
| 272 |
for (i = 0; i <= 2; i++) |
| 273 |
photon.norm [i] = 127.0 * (isVolumePmap(pmap) ? ray -> rdir [i] |
| 274 |
: ray -> ron [i]); |
| 275 |
|
| 276 |
if (!pmap -> heapBuf) { |
| 277 |
/* Lazily allocate heap buffa */ |
| 278 |
#if NIX |
| 279 |
/* Randomise buffa size to temporally decorellate flushes in |
| 280 |
* multiprocessing mode */ |
| 281 |
srandom(randSeed + getpid()); |
| 282 |
pmap -> heapBufSize = PMAP_HEAPBUFSIZE * (0.5 + frandom()); |
| 283 |
#else |
| 284 |
/* Randomisation disabled for single processes on WIN; also useful |
| 285 |
* for reproducability during debugging */ |
| 286 |
pmap -> heapBufSize = PMAP_HEAPBUFSIZE; |
| 287 |
#endif |
| 288 |
if (!(pmap -> heapBuf = calloc(pmap -> heapBufSize, sizeof(Photon)))) |
| 289 |
error(SYSTEM, "failed heap buffer allocation in newPhoton"); |
| 290 |
pmap -> heapBufLen = 0; |
| 291 |
} |
| 292 |
|
| 293 |
/* Photon initialised; now append to heap buffa */ |
| 294 |
memcpy(pmap -> heapBuf + pmap -> heapBufLen, &photon, sizeof(Photon)); |
| 295 |
|
| 296 |
if (++pmap -> heapBufLen >= pmap -> heapBufSize) |
| 297 |
/* Heap buffa full, flush to heap file */ |
| 298 |
flushPhotonHeap(pmap); |
| 299 |
|
| 300 |
pmap -> numPhotons++; |
| 301 |
|
| 302 |
/* Print photon attributes */ |
| 303 |
if (printPhoton) |
| 304 |
/* Non-const kludge */ |
| 305 |
printPhoton((RAY*)ray, &photon, pmap); |
| 306 |
|
| 307 |
return 0; |
| 308 |
} |
| 309 |
|
| 310 |
|
| 311 |
|
| 312 |
void buildPhotonMap (PhotonMap *pmap, double *photonFlux, |
| 313 |
PhotonPrimaryIdx *primaryOfs, unsigned nproc) |
| 314 |
{ |
| 315 |
unsigned long n, nCheck = 0; |
| 316 |
unsigned i; |
| 317 |
Photon *p; |
| 318 |
COLOR flux; |
| 319 |
char nuHeapFname [sizeof(PMAP_TMPFNAME)]; |
| 320 |
FILE *nuHeap; |
| 321 |
/* Need double here to reduce summation errors */ |
| 322 |
double avgFlux [3] = {0, 0, 0}, CoG [3] = {0, 0, 0}, CoGdist = 0; |
| 323 |
FVECT d; |
| 324 |
|
| 325 |
if (!pmap) |
| 326 |
error(INTERNAL, "undefined photon map in buildPhotonMap"); |
| 327 |
|
| 328 |
/* Get number of photons from heapfile size */ |
| 329 |
if (fseek(pmap -> heap, 0, SEEK_END) < 0) |
| 330 |
error(SYSTEM, "failed seek to end of photon heap in buildPhotonMap"); |
| 331 |
pmap -> numPhotons = ftell(pmap -> heap) / sizeof(Photon); |
| 332 |
|
| 333 |
if (!pmap -> numPhotons) |
| 334 |
error(INTERNAL, "empty photon map in buildPhotonMap"); |
| 335 |
|
| 336 |
if (!pmap -> heap) |
| 337 |
error(INTERNAL, "no heap in buildPhotonMap"); |
| 338 |
|
| 339 |
#ifdef DEBUG_PMAP |
| 340 |
eputs("Checking photon heap consistency...\n"); |
| 341 |
checkPhotonHeap(pmap -> heap); |
| 342 |
|
| 343 |
sprintf(errmsg, "Heap contains %ld photons\n", pmap -> numPhotons); |
| 344 |
eputs(errmsg); |
| 345 |
#endif |
| 346 |
|
| 347 |
/* Allocate heap buffa */ |
| 348 |
if (!pmap -> heapBuf) { |
| 349 |
pmap -> heapBufSize = PMAP_HEAPBUFSIZE; |
| 350 |
pmap -> heapBuf = calloc(pmap -> heapBufSize, sizeof(Photon)); |
| 351 |
if (!pmap -> heapBuf) |
| 352 |
error(SYSTEM, "failed to allocate postprocessed photon heap in" |
| 353 |
"buildPhotonMap"); |
| 354 |
} |
| 355 |
|
| 356 |
/* We REALLY don't need yet another @%&*! heap just to hold the scaled |
| 357 |
* photons, but can't think of a quicker fix... */ |
| 358 |
mktemp(strcpy(nuHeapFname, PMAP_TMPFNAME)); |
| 359 |
if (!(nuHeap = fopen(nuHeapFname, "w+b"))) |
| 360 |
error(SYSTEM, "failed to open postprocessed photon heap in " |
| 361 |
"buildPhotonMap"); |
| 362 |
|
| 363 |
rewind(pmap -> heap); |
| 364 |
|
| 365 |
#ifdef DEBUG_PMAP |
| 366 |
eputs("Postprocessing photons...\n"); |
| 367 |
#endif |
| 368 |
|
| 369 |
while (!feof(pmap -> heap)) { |
| 370 |
#ifdef DEBUG_PMAP |
| 371 |
printf("Reading %lu at %lu... ", pmap -> heapBufSize, ftell(pmap->heap)); |
| 372 |
#endif |
| 373 |
pmap -> heapBufLen = fread(pmap -> heapBuf, sizeof(Photon), |
| 374 |
pmap -> heapBufSize, pmap -> heap); |
| 375 |
#ifdef DEBUG_PMAP |
| 376 |
printf("Got %lu\n", pmap -> heapBufLen); |
| 377 |
#endif |
| 378 |
|
| 379 |
if (ferror(pmap -> heap)) |
| 380 |
error(SYSTEM, "failed to read photon heap in buildPhotonMap"); |
| 381 |
|
| 382 |
for (n = pmap -> heapBufLen, p = pmap -> heapBuf; n; n--, p++) { |
| 383 |
/* Update min and max pos and set photon flux */ |
| 384 |
for (i = 0; i <= 2; i++) { |
| 385 |
if (p -> pos [i] < pmap -> minPos [i]) |
| 386 |
pmap -> minPos [i] = p -> pos [i]; |
| 387 |
else if (p -> pos [i] > pmap -> maxPos [i]) |
| 388 |
pmap -> maxPos [i] = p -> pos [i]; |
| 389 |
|
| 390 |
/* Update centre of gravity with photon position */ |
| 391 |
CoG [i] += p -> pos [i]; |
| 392 |
} |
| 393 |
|
| 394 |
if (primaryOfs) |
| 395 |
/* Linearise photon primary index from subprocess index using the |
| 396 |
* per-subprocess offsets in primaryOfs */ |
| 397 |
p -> primary += primaryOfs [p -> proc]; |
| 398 |
|
| 399 |
/* Scale photon's flux (hitherto normalised to 1 over RGB); in |
| 400 |
* case of a contrib photon map, this is done per light source, |
| 401 |
* and photonFlux is assumed to be an array */ |
| 402 |
getPhotonFlux(p, flux); |
| 403 |
|
| 404 |
if (photonFlux) { |
| 405 |
scalecolor(flux, photonFlux [isContribPmap(pmap) ? |
| 406 |
photonSrcIdx(pmap, p) : 0]); |
| 407 |
setPhotonFlux(p, flux); |
| 408 |
} |
| 409 |
|
| 410 |
/* Update average photon flux; need a double here */ |
| 411 |
addcolor(avgFlux, flux); |
| 412 |
} |
| 413 |
|
| 414 |
/* Write modified photons to new heap */ |
| 415 |
fwrite(pmap -> heapBuf, sizeof(Photon), pmap -> heapBufLen, nuHeap); |
| 416 |
|
| 417 |
if (ferror(nuHeap)) |
| 418 |
error(SYSTEM, "failed postprocessing photon flux in " |
| 419 |
"buildPhotonMap"); |
| 420 |
|
| 421 |
nCheck += pmap -> heapBufLen; |
| 422 |
} |
| 423 |
|
| 424 |
#ifdef DEBUG_PMAP |
| 425 |
if (nCheck < pmap -> numPhotons) |
| 426 |
error(INTERNAL, "truncated photon heap in buildPhotonMap"); |
| 427 |
#endif |
| 428 |
|
| 429 |
/* Finalise average photon flux */ |
| 430 |
scalecolor(avgFlux, 1.0 / pmap -> numPhotons); |
| 431 |
copycolor(pmap -> photonFlux, avgFlux); |
| 432 |
|
| 433 |
/* Average photon positions to get centre of gravity */ |
| 434 |
for (i = 0; i < 3; i++) |
| 435 |
pmap -> CoG [i] = CoG [i] /= pmap -> numPhotons; |
| 436 |
|
| 437 |
rewind(pmap -> heap); |
| 438 |
|
| 439 |
/* Compute average photon distance to centre of gravity */ |
| 440 |
while (!feof(pmap -> heap)) { |
| 441 |
pmap -> heapBufLen = fread(pmap -> heapBuf, sizeof(Photon), |
| 442 |
pmap -> heapBufSize, pmap -> heap); |
| 443 |
|
| 444 |
for (n = pmap -> heapBufLen, p = pmap -> heapBuf; n; n--, p++) { |
| 445 |
VSUB(d, p -> pos, CoG); |
| 446 |
CoGdist += DOT(d, d); |
| 447 |
} |
| 448 |
} |
| 449 |
|
| 450 |
pmap -> CoGdist = CoGdist /= pmap -> numPhotons; |
| 451 |
|
| 452 |
/* Swap heaps, discarding unscaled photons */ |
| 453 |
fclose(pmap -> heap); |
| 454 |
unlink(pmap -> heapFname); |
| 455 |
pmap -> heap = nuHeap; |
| 456 |
strcpy(pmap -> heapFname, nuHeapFname); |
| 457 |
|
| 458 |
#ifdef PMAP_OOC |
| 459 |
OOC_BuildPhotonMap(pmap, nproc); |
| 460 |
#else |
| 461 |
kdT_BuildPhotonMap(pmap); |
| 462 |
#endif |
| 463 |
|
| 464 |
/* Trash heap and its buffa */ |
| 465 |
free(pmap -> heapBuf); |
| 466 |
fclose(pmap -> heap); |
| 467 |
unlink(pmap -> heapFname); |
| 468 |
pmap -> heap = NULL; |
| 469 |
pmap -> heapBuf = NULL; |
| 470 |
} |
| 471 |
|
| 472 |
|
| 473 |
|
| 474 |
/* Dynamic max photon search radius increase and reduction factors */ |
| 475 |
#define PMAP_MAXDIST_INC 4 |
| 476 |
#define PMAP_MAXDIST_DEC 0.9 |
| 477 |
|
| 478 |
/* Num successful lookups before reducing in max search radius */ |
| 479 |
#define PMAP_MAXDIST_CNT 1000 |
| 480 |
|
| 481 |
/* Threshold below which we assume increasing max radius won't help */ |
| 482 |
#define PMAP_SHORT_LOOKUP_THRESH 1 |
| 483 |
|
| 484 |
/* Coefficient for adaptive maximum search radius */ |
| 485 |
#define PMAP_MAXDIST_COEFF 100 |
| 486 |
|
| 487 |
void findPhotons (PhotonMap* pmap, const RAY* ray) |
| 488 |
{ |
| 489 |
int redo = 0; |
| 490 |
|
| 491 |
if (!pmap -> squeue.len) { |
| 492 |
/* Lazy init priority queue */ |
| 493 |
#ifdef PMAP_OOC |
| 494 |
OOC_InitFindPhotons(pmap); |
| 495 |
#else |
| 496 |
kdT_InitFindPhotons(pmap); |
| 497 |
#endif |
| 498 |
pmap -> minGathered = pmap -> maxGather; |
| 499 |
pmap -> maxGathered = pmap -> minGather; |
| 500 |
pmap -> totalGathered = 0; |
| 501 |
pmap -> numLookups = pmap -> numShortLookups = 0; |
| 502 |
pmap -> shortLookupPct = 0; |
| 503 |
pmap -> minError = FHUGE; |
| 504 |
pmap -> maxError = -FHUGE; |
| 505 |
pmap -> rmsError = 0; |
| 506 |
/* SQUARED max search radius limit is based on avg photon distance to |
| 507 |
* centre of gravity, unless fixed by user (maxDistFix > 0) */ |
| 508 |
pmap -> maxDist0 = pmap -> maxDist2Limit = |
| 509 |
maxDistFix > 0 ? maxDistFix * maxDistFix |
| 510 |
: PMAP_MAXDIST_COEFF * pmap -> squeue.len * |
| 511 |
pmap -> CoGdist / pmap -> numPhotons; |
| 512 |
} |
| 513 |
|
| 514 |
do { |
| 515 |
pmap -> squeue.tail = 0; |
| 516 |
pmap -> maxDist2 = pmap -> maxDist0; |
| 517 |
|
| 518 |
/* Search position is ray -> rorg for volume photons, since we have no |
| 519 |
intersection point. Normals are ignored -- these are incident |
| 520 |
directions). */ |
| 521 |
/* NOTE: status returned by XXX_FindPhotons() is currently ignored; |
| 522 |
if no photons are found, an empty queue is returned under the |
| 523 |
assumption all photons are too distant to contribute significant |
| 524 |
flux. */ |
| 525 |
if (isVolumePmap(pmap)) { |
| 526 |
#ifdef PMAP_OOC |
| 527 |
OOC_FindPhotons(pmap, ray -> rorg, NULL); |
| 528 |
#else |
| 529 |
kdT_FindPhotons(pmap, ray -> rorg, NULL); |
| 530 |
#endif |
| 531 |
} |
| 532 |
else { |
| 533 |
#ifdef PMAP_OOC |
| 534 |
OOC_FindPhotons(pmap, ray -> rop, ray -> ron); |
| 535 |
#else |
| 536 |
kdT_FindPhotons(pmap, ray -> rop, ray -> ron); |
| 537 |
#endif |
| 538 |
} |
| 539 |
|
| 540 |
#ifdef PMAP_LOOKUP_INFO |
| 541 |
fprintf(stderr, "%d/%d %s photons found within radius %.3f " |
| 542 |
"at (%.2f,%.2f,%.2f) on %s\n", pmap -> squeue.tail, |
| 543 |
pmap -> squeue.len, pmapName [pmap -> type], sqrt(pmap -> maxDist2), |
| 544 |
ray -> rop [0], ray -> rop [1], ray -> rop [2], |
| 545 |
ray -> ro ? ray -> ro -> oname : "<null>"); |
| 546 |
#endif |
| 547 |
|
| 548 |
if (pmap -> squeue.tail < pmap -> squeue.len * pmap -> gatherTolerance) { |
| 549 |
/* Short lookup; too few photons found */ |
| 550 |
if (pmap -> squeue.tail > PMAP_SHORT_LOOKUP_THRESH) { |
| 551 |
/* Ignore short lookups which return fewer than |
| 552 |
* PMAP_SHORT_LOOKUP_THRESH photons under the assumption there |
| 553 |
* really are no photons in the vicinity, and increasing the max |
| 554 |
* search radius therefore won't help */ |
| 555 |
#ifdef PMAP_LOOKUP_WARN |
| 556 |
sprintf(errmsg, |
| 557 |
"%d/%d %s photons found at (%.2f,%.2f,%.2f) on %s", |
| 558 |
pmap -> squeue.tail, pmap -> squeue.len, |
| 559 |
pmapName [pmap -> type], |
| 560 |
ray -> rop [0], ray -> rop [1], ray -> rop [2], |
| 561 |
ray -> ro ? ray -> ro -> oname : "<null>"); |
| 562 |
error(WARNING, errmsg); |
| 563 |
#endif |
| 564 |
|
| 565 |
/* Bail out after warning if maxDist is fixed */ |
| 566 |
if (maxDistFix > 0) |
| 567 |
return; |
| 568 |
|
| 569 |
if (pmap -> maxDist0 < pmap -> maxDist2Limit) { |
| 570 |
/* Increase max search radius if below limit & redo search */ |
| 571 |
pmap -> maxDist0 *= PMAP_MAXDIST_INC; |
| 572 |
#ifdef PMAP_LOOKUP_REDO |
| 573 |
redo = 1; |
| 574 |
#endif |
| 575 |
#ifdef PMAP_LOOKUP_WARN |
| 576 |
sprintf(errmsg, |
| 577 |
redo ? "restarting photon lookup with max radius %.1e" |
| 578 |
: "max photon lookup radius adjusted to %.1e", |
| 579 |
pmap -> maxDist0); |
| 580 |
error(WARNING, errmsg); |
| 581 |
#endif |
| 582 |
} |
| 583 |
#ifdef PMAP_LOOKUP_REDO |
| 584 |
else { |
| 585 |
sprintf(errmsg, "max photon lookup radius clamped to %.1e", |
| 586 |
pmap -> maxDist0); |
| 587 |
error(WARNING, errmsg); |
| 588 |
} |
| 589 |
#endif |
| 590 |
} |
| 591 |
|
| 592 |
/* Reset successful lookup counter */ |
| 593 |
pmap -> numLookups = 0; |
| 594 |
} |
| 595 |
else { |
| 596 |
/* Bail out after warning if maxDist is fixed */ |
| 597 |
if (maxDistFix > 0) |
| 598 |
return; |
| 599 |
|
| 600 |
/* Increment successful lookup counter and reduce max search radius if |
| 601 |
* wraparound */ |
| 602 |
pmap -> numLookups = (pmap -> numLookups + 1) % PMAP_MAXDIST_CNT; |
| 603 |
if (!pmap -> numLookups) |
| 604 |
pmap -> maxDist0 *= PMAP_MAXDIST_DEC; |
| 605 |
|
| 606 |
redo = 0; |
| 607 |
} |
| 608 |
|
| 609 |
} while (redo); |
| 610 |
} |
| 611 |
|
| 612 |
|
| 613 |
|
| 614 |
Photon *find1Photon (PhotonMap *pmap, const RAY* ray, Photon *photon) |
| 615 |
{ |
| 616 |
/* Init (squared) search radius to avg photon dist to centre of gravity */ |
| 617 |
float maxDist2_0 = pmap -> CoGdist; |
| 618 |
int found = 0; |
| 619 |
#ifdef PMAP_LOOKUP_REDO |
| 620 |
#define REDO 1 |
| 621 |
#else |
| 622 |
#define REDO 0 |
| 623 |
#endif |
| 624 |
|
| 625 |
do { |
| 626 |
pmap -> maxDist2 = maxDist2_0; |
| 627 |
#ifdef PMAP_OOC |
| 628 |
found = OOC_Find1Photon(pmap, ray -> rop, ray -> ron, photon); |
| 629 |
#else |
| 630 |
found = kdT_Find1Photon(pmap, ray -> rop, ray -> ron, photon); |
| 631 |
#endif |
| 632 |
if (found < 0) { |
| 633 |
/* Expand search radius to retry */ |
| 634 |
maxDist2_0 *= 2; |
| 635 |
#ifdef PMAP_LOOKUP_WARN |
| 636 |
sprintf(errmsg, "failed 1-NN photon lookup" |
| 637 |
#ifdef PMAP_LOOKUP_REDO |
| 638 |
", retrying with search radius %.2f", maxDist2_0 |
| 639 |
#endif |
| 640 |
); |
| 641 |
error(WARNING, errmsg); |
| 642 |
#endif |
| 643 |
} |
| 644 |
} while (REDO && found < 0); |
| 645 |
|
| 646 |
/* Return photon buffer containing valid photon, else NULL */ |
| 647 |
return found < 0 ? NULL : photon; |
| 648 |
} |
| 649 |
|
| 650 |
|
| 651 |
|
| 652 |
void getPhoton (PhotonMap *pmap, PhotonIdx idx, Photon *photon) |
| 653 |
{ |
| 654 |
#ifdef PMAP_OOC |
| 655 |
if (OOC_GetPhoton(pmap, idx, photon)) |
| 656 |
#else |
| 657 |
if (kdT_GetPhoton(pmap, idx, photon)) |
| 658 |
#endif |
| 659 |
error(INTERNAL, "failed photon lookup"); |
| 660 |
} |
| 661 |
|
| 662 |
|
| 663 |
|
| 664 |
Photon *getNearestPhoton (const PhotonSearchQueue *squeue, PhotonIdx idx) |
| 665 |
{ |
| 666 |
#ifdef PMAP_OOC |
| 667 |
return OOC_GetNearestPhoton(squeue, idx); |
| 668 |
#else |
| 669 |
return kdT_GetNearestPhoton(squeue, idx); |
| 670 |
#endif |
| 671 |
} |
| 672 |
|
| 673 |
|
| 674 |
|
| 675 |
PhotonIdx firstPhoton (const PhotonMap *pmap) |
| 676 |
{ |
| 677 |
#ifdef PMAP_OOC |
| 678 |
return OOC_FirstPhoton(pmap); |
| 679 |
#else |
| 680 |
return kdT_FirstPhoton(pmap); |
| 681 |
#endif |
| 682 |
} |
| 683 |
|
| 684 |
|
| 685 |
|
| 686 |
void deletePhotons (PhotonMap* pmap) |
| 687 |
{ |
| 688 |
#ifdef PMAP_OOC |
| 689 |
OOC_Delete(&pmap -> store); |
| 690 |
#else |
| 691 |
kdT_Delete(&pmap -> store); |
| 692 |
#endif |
| 693 |
|
| 694 |
free(pmap -> squeue.node); |
| 695 |
free(pmap -> biasCompHist); |
| 696 |
|
| 697 |
pmap -> numPhotons = pmap -> minGather = pmap -> maxGather = |
| 698 |
pmap -> squeue.len = pmap -> squeue.tail = 0; |
| 699 |
} |
