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#ifndef lint |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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================================================================== |
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====================================================================== |
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Photon map main module |
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Roland Schregle (roland.schregle@{hslu.ch, gmail.com}) |
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(c) Fraunhofer Institute for Solar Energy Systems, |
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(c) Lucerne University of Applied Sciences and Arts, |
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supported by the Swiss National Science Foundation (SNSF, #147053) |
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================================================================== |
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supported by the Swiss National Science Foundation (SNSF, #147053) |
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====================================================================== |
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$Id$ |
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*/ |
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#include "otypes.h" |
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#include <time.h> |
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#include <sys/stat.h> |
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#include <sys/mman.h> |
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#include <sys/wait.h> |
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extern char *octname; |
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static char PmapRevision [] = "$Revision$"; |
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/* Photon map lookup functions per type */ |
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void (*pmapLookup [NUM_PMAP_TYPES])(PhotonMap*, RAY*, COLOR) = { |
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photonDensity, photonPreCompDensity, photonDensity, volumePhotonDensity, |
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photonDensity, NULL |
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}; |
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void colorNorm (COLOR c) |
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/* Normalise colour channels to average of 1 */ |
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{ |
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const float avg = colorAvg(c); |
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|
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if (!avg) |
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return; |
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|
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c [0] /= avg; |
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c [1] /= avg; |
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c [2] /= avg; |
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} |
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void loadPmaps (PhotonMap **pmaps, const PhotonMapParams *parm) |
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{ |
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unsigned t; |
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struct stat octstat, pmstat; |
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PhotonMap *pm; |
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PhotonMapType type; |
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|
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for (t = 0; t < NUM_PMAP_TYPES; t++) |
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if (setPmapParam(&pm, parm + t)) { |
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/* Check if photon map newer than octree */ |
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if (pm -> fileName && octname && |
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!stat(pm -> fileName, &pmstat) && !stat(octname, &octstat) && |
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octstat.st_mtime > pmstat.st_mtime) { |
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sprintf(errmsg, "photon map in file %s may be stale", |
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pm -> fileName); |
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error(USER, errmsg); |
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} |
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|
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/* Load photon map from file and get its type */ |
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if ((type = loadPhotonMap(pm, pm -> fileName)) == PMAP_TYPE_NONE) |
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error(USER, "failed loading photon map"); |
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|
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/* Assign to appropriate photon map type (deleting previously |
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* loaded photon map of same type if necessary) */ |
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if (pmaps [type]) { |
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deletePhotons(pmaps [type]); |
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free(pmaps [type]); |
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} |
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pmaps [type] = pm; |
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|
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/* Check for invalid density estimate bandwidth */ |
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if (pm -> maxGather > pm -> heapSize) { |
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error(WARNING, "adjusting density estimate bandwidth"); |
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pm -> minGather = pm -> maxGather = pm -> heapSize; |
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} |
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} |
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} |
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void savePmaps (const PhotonMap **pmaps, int argc, char **argv) |
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{ |
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unsigned t; |
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} |
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void cleanUpPmaps (PhotonMap **pmaps) |
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{ |
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unsigned t; |
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|
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for (t = 0; t < NUM_PMAP_TYPES; t++) { |
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if (pmaps [t]) { |
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deletePhotons(pmaps [t]); |
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free(pmaps [t]); |
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} |
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} |
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} |
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|
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static int photonParticipate (RAY *ray) |
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/* Trace photon through participating medium. Returns 1 if passed through, |
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colorNorm(ray -> rcol); |
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VCOPY(ray -> rorg, ray -> rop); |
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if (albedo > FTINY) |
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if (albedo > FTINY && ray -> rlvl > 0) |
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/* Add to volume photon map */ |
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if (ray -> rlvl > 0) addPhoton(volumePmap, ray); |
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newPhoton(volumePmap, ray); |
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/* Absorbed? */ |
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if (pmapRandom(rouletteState) > albedo) return 0; |
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if (pmapRandom(rouletteState) > albedo) |
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return 0; |
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/* Colour bleeding without attenuation (?) */ |
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multcolor(ray -> rcol, ray -> albedo); |
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static void preComputeGlobal (PhotonMap *pmap) |
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/* Precompute irradiance from global photons for final gathering using |
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the first finalGather * pmap -> heapSize photons in the heap. Returns |
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new heap with precomputed photons. */ |
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/* Precompute irradiance from global photons for final gathering for |
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a random subset of finalGather * pmap -> numPhotons photons, and builds |
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the photon map, discarding the original photons. */ |
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/* !!! NOTE: PRECOMPUTATION WITH OOC CURRENTLY WITHOUT CACHE !!! */ |
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{ |
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unsigned long i, nuHeapSize; |
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unsigned j; |
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Photon *nuHeap, *p; |
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COLOR irrad; |
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RAY ray; |
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float nuMinPos [3], nuMaxPos [3]; |
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unsigned long i, numPreComp; |
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unsigned j; |
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PhotonIdx pIdx; |
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Photon photon; |
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RAY ray; |
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PhotonMap nuPmap; |
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repComplete = nuHeapSize = finalGather * pmap -> heapSize; |
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repComplete = numPreComp = finalGather * pmap -> numPhotons; |
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|
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if (photonRepTime) { |
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sprintf(errmsg, |
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"Precomputing irradiance for %ld global photons...\n", |
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nuHeapSize); |
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sprintf(errmsg, "Precomputing irradiance for %ld global photons...\n", |
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> |
numPreComp); |
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eputs(errmsg); |
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fflush(stderr); |
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} |
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p = nuHeap = (Photon*)malloc(nuHeapSize * sizeof(Photon)); |
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if (!nuHeap) |
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< |
error(USER, "can't allocate photon heap"); |
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< |
|
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< |
for (j = 0; j <= 2; j++) { |
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nuMinPos [j] = FHUGE; |
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nuMaxPos [j] = -FHUGE; |
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} |
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> |
/* Copy photon map for precomputed photons */ |
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> |
memcpy(&nuPmap, pmap, sizeof(PhotonMap)); |
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> |
|
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> |
/* Zero counters, init new heap and extents */ |
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> |
nuPmap.numPhotons = 0; |
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> |
initPhotonHeap(&nuPmap); |
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for (j = 0; j < 3; j++) { |
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nuPmap.minPos [j] = FHUGE; |
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nuPmap.maxPos [j] = -FHUGE; |
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} |
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|
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/* Record start time, baby */ |
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repStartTime = time(NULL); |
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< |
#ifdef SIGCONT |
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< |
signal(SIGCONT, pmapPreCompReport); |
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< |
#endif |
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> |
#ifdef SIGCONT |
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> |
signal(SIGCONT, pmapPreCompReport); |
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> |
#endif |
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repProgress = 0; |
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memcpy(nuHeap, pmap -> heap, nuHeapSize * sizeof(Photon)); |
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|
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for (i = 0, p = nuHeap; i < nuHeapSize; i++, p++) { |
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ray.ro = NULL; |
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VCOPY(ray.rop, p -> pos); |
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> |
photonRay(NULL, &ray, PRIMARY, NULL); |
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> |
ray.ro = NULL; |
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> |
|
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> |
for (i = 0; i < numPreComp; i++) { |
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> |
/* Get random photon from stratified distribution in source heap to |
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* avoid duplicates and clutering */ |
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> |
pIdx = firstPhoton(pmap) + |
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(unsigned long)((i + pmapRandom(pmap -> randState)) / |
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finalGather); |
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> |
getPhoton(pmap, pIdx, &photon); |
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|
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/* Update min and max positions & set ray normal */ |
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for (j = 0; j < 3; j++) { |
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if (p -> pos [j] < nuMinPos [j]) nuMinPos [j] = p -> pos [j]; |
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< |
if (p -> pos [j] > nuMaxPos [j]) nuMaxPos [j] = p -> pos [j]; |
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ray.ron [j] = p -> norm [j] / 127.0; |
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} |
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> |
/* Init dummy photon ray with intersection at photon position */ |
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> |
VCOPY(ray.rop, photon.pos); |
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> |
for (j = 0; j < 3; j++) |
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> |
ray.ron [j] = photon.norm [j] / 127.0; |
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< |
photonDensity(pmap, &ray, irrad); |
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< |
setPhotonFlux(p, irrad); |
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> |
/* Get density estimate at photon position */ |
| 219 |
> |
photonDensity(pmap, &ray, ray.rcol); |
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> |
|
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> |
/* Append photon to new heap from ray */ |
| 222 |
> |
newPhoton(&nuPmap, &ray); |
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> |
|
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> |
/* Update progress */ |
| 225 |
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repProgress++; |
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|
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if (photonRepTime > 0 && time(NULL) >= repLastTime + photonRepTime) |
| 228 |
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pmapPreCompReport(); |
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< |
#ifdef SIGCONT |
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< |
else signal(SIGCONT, pmapPreCompReport); |
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< |
#endif |
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> |
#ifdef SIGCONT |
| 230 |
> |
else signal(SIGCONT, pmapPreCompReport); |
| 231 |
> |
#endif |
| 232 |
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} |
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< |
#ifdef SIGCONT |
| 235 |
< |
signal(SIGCONT, SIG_DFL); |
| 302 |
< |
#endif |
| 234 |
> |
/* Flush heap */ |
| 235 |
> |
flushPhotonHeap(&nuPmap); |
| 236 |
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|
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< |
/* Replace & rebuild heap */ |
| 238 |
< |
free(pmap -> heap); |
| 239 |
< |
pmap -> heap = nuHeap; |
| 307 |
< |
pmap -> heapSize = pmap -> heapEnd = nuHeapSize; |
| 308 |
< |
VCOPY(pmap -> minPos, nuMinPos); |
| 309 |
< |
VCOPY(pmap -> maxPos, nuMaxPos); |
| 237 |
> |
#ifdef SIGCONT |
| 238 |
> |
signal(SIGCONT, SIG_DFL); |
| 239 |
> |
#endif |
| 240 |
|
|
| 241 |
+ |
/* Trash original pmap, replace with precomputed one */ |
| 242 |
+ |
deletePhotons(pmap); |
| 243 |
+ |
memcpy(pmap, &nuPmap, sizeof(PhotonMap)); |
| 244 |
+ |
|
| 245 |
|
if (photonRepTime) { |
| 246 |
< |
eputs("Rebuilding global photon heap...\n"); |
| 246 |
> |
eputs("Rebuilding precomputed photon map...\n"); |
| 247 |
|
fflush(stderr); |
| 248 |
|
} |
| 249 |
< |
|
| 250 |
< |
balancePhotons(pmap, NULL); |
| 249 |
> |
|
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> |
/* Rebuild underlying data structure, destroying heap */ |
| 251 |
> |
buildPhotonMap(pmap, NULL, NULL, 1); |
| 252 |
|
} |
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|
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|
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< |
void distribPhotons (PhotonMap **pmaps) |
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> |
typedef struct { |
| 257 |
> |
unsigned long numPhotons [NUM_PMAP_TYPES], |
| 258 |
> |
numEmitted, numComplete; |
| 259 |
> |
} PhotonCnt; |
| 260 |
> |
|
| 261 |
> |
|
| 262 |
> |
|
| 263 |
> |
void distribPhotons (PhotonMap **pmaps, unsigned numProc) |
| 264 |
|
{ |
| 265 |
< |
EmissionMap emap; |
| 266 |
< |
char errmsg2 [128]; |
| 267 |
< |
unsigned t, srcIdx, passCnt = 0, prePassCnt = 0; |
| 268 |
< |
double totalFlux = 0; |
| 269 |
< |
PhotonMap *pm; |
| 265 |
> |
EmissionMap emap; |
| 266 |
> |
char errmsg2 [128], shmFname [255]; |
| 267 |
> |
unsigned t, srcIdx, proc; |
| 268 |
> |
double totalFlux = 0; |
| 269 |
> |
int shmFile, stat, pid; |
| 270 |
> |
PhotonMap *pm; |
| 271 |
> |
PhotonCnt *photonCnt; |
| 272 |
|
|
| 273 |
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for (t = 0; t < NUM_PMAP_TYPES && !pmaps [t]; t++); |
| 274 |
+ |
|
| 275 |
|
if (t >= NUM_PMAP_TYPES) |
| 276 |
< |
error(USER, "no photon maps defined"); |
| 276 |
> |
error(USER, "no photon maps defined in distribPhotons"); |
| 277 |
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|
| 278 |
|
if (!nsources) |
| 279 |
< |
error(USER, "no light sources"); |
| 279 |
> |
error(USER, "no light sources in distribPhotons"); |
| 280 |
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|
| 281 |
|
/* =================================================================== |
| 282 |
|
* INITIALISATION - Set up emission and scattering funcs |
| 285 |
|
emap.maxPartitions = MAXSPART; |
| 286 |
|
emap.partitions = (unsigned char*)malloc(emap.maxPartitions >> 1); |
| 287 |
|
if (!emap.partitions) |
| 288 |
< |
error(INTERNAL, "can't allocate source partitions"); |
| 288 |
> |
error(INTERNAL, "can't allocate source partitions in distribPhotons"); |
| 289 |
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|
| 290 |
|
/* Initialise all defined photon maps */ |
| 291 |
|
for (t = 0; t < NUM_PMAP_TYPES; t++) |
| 292 |
< |
initPhotonMap(pmaps [t], t); |
| 292 |
> |
if (pmaps [t]) { |
| 293 |
> |
initPhotonMap(pmaps [t], t); |
| 294 |
> |
/* Open photon heapfile */ |
| 295 |
> |
initPhotonHeap(pmaps [t]); |
| 296 |
> |
/* Per-subprocess target count */ |
| 297 |
> |
pmaps [t] -> distribTarget /= numProc; |
| 298 |
> |
} |
| 299 |
|
|
| 300 |
|
initPhotonEmissionFuncs(); |
| 301 |
|
initPhotonScatterFuncs(); |
| 307 |
|
/* Get photon sensor modifiers */ |
| 308 |
|
getPhotonSensors(photonSensorList); |
| 309 |
|
|
| 310 |
< |
/* Seed RNGs for photon distribution */ |
| 311 |
< |
pmapSeed(randSeed, partState); |
| 312 |
< |
pmapSeed(randSeed, emitState); |
| 313 |
< |
pmapSeed(randSeed, cntState); |
| 314 |
< |
pmapSeed(randSeed, mediumState); |
| 315 |
< |
pmapSeed(randSeed, scatterState); |
| 316 |
< |
pmapSeed(randSeed, rouletteState); |
| 317 |
< |
|
| 310 |
> |
/* Set up shared mem for photon counters (zeroed by ftruncate) */ |
| 311 |
> |
#if 0 |
| 312 |
> |
snprintf(shmFname, 255, PMAP_SHMFNAME, getpid()); |
| 313 |
> |
shmFile = shm_open(shmFname, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR); |
| 314 |
> |
#else |
| 315 |
> |
strcpy(shmFname, PMAP_SHMFNAME); |
| 316 |
> |
shmFile = mkstemp(shmFname); |
| 317 |
> |
#endif |
| 318 |
> |
|
| 319 |
> |
if (shmFile < 0) |
| 320 |
> |
error(SYSTEM, "failed opening shared memory file in distribPhotons"); |
| 321 |
> |
|
| 322 |
> |
if (ftruncate(shmFile, sizeof(*photonCnt)) < 0) |
| 323 |
> |
error(SYSTEM, "failed setting shared memory size in distribPhotons"); |
| 324 |
> |
|
| 325 |
> |
photonCnt = mmap(NULL, sizeof(*photonCnt), PROT_READ | PROT_WRITE, |
| 326 |
> |
MAP_SHARED, shmFile, 0); |
| 327 |
> |
|
| 328 |
> |
if (photonCnt == MAP_FAILED) |
| 329 |
> |
error(SYSTEM, "failed mapping shared memory in distribPhotons"); |
| 330 |
> |
|
| 331 |
|
if (photonRepTime) |
| 332 |
|
eputs("\n"); |
| 333 |
|
|
| 334 |
|
/* =================================================================== |
| 335 |
|
* FLUX INTEGRATION - Get total photon flux from light sources |
| 336 |
|
* =================================================================== */ |
| 337 |
< |
for (srcIdx = 0; srcIdx < nsources; srcIdx++) { |
| 337 |
> |
for (srcIdx = 0; srcIdx < nsources; srcIdx++) { |
| 338 |
|
unsigned portCnt = 0; |
| 339 |
|
emap.src = source + srcIdx; |
| 340 |
|
|
| 341 |
< |
do { |
| 341 |
> |
do { /* Need at least one iteration if no ports! */ |
| 342 |
|
emap.port = emap.src -> sflags & SDISTANT ? photonPorts + portCnt |
| 343 |
|
: NULL; |
| 344 |
|
photonPartition [emap.src -> so -> otype] (&emap); |
| 372 |
|
if (totalFlux < FTINY) |
| 373 |
|
error(USER, "zero flux from light sources"); |
| 374 |
|
|
| 375 |
< |
/* Record start time and enable progress report signal handler */ |
| 376 |
< |
repStartTime = time(NULL); |
| 377 |
< |
#ifdef SIGCONT |
| 378 |
< |
signal(SIGCONT, pmapDistribReport); |
| 379 |
< |
#endif |
| 380 |
< |
repProgress = prePassCnt = 0; |
| 381 |
< |
|
| 382 |
< |
if (photonRepTime) |
| 383 |
< |
eputs("\n"); |
| 420 |
< |
|
| 421 |
< |
/* =================================================================== |
| 422 |
< |
* 2-PASS PHOTON DISTRIBUTION |
| 423 |
< |
* Pass 1 (pre): emit fraction of target photon count |
| 424 |
< |
* Pass 2 (main): based on outcome of pass 1, estimate remaining number |
| 425 |
< |
* of photons to emit to approximate target count |
| 426 |
< |
* =================================================================== */ |
| 427 |
< |
do { |
| 428 |
< |
double numEmit; |
| 429 |
< |
|
| 430 |
< |
if (!passCnt) { |
| 431 |
< |
/* INIT PASS 1 */ |
| 432 |
< |
/* Skip if no photons contributed after sufficient iterations; make |
| 433 |
< |
* it clear to user which photon maps are missing so (s)he can |
| 434 |
< |
* check the scene geometry and materials */ |
| 435 |
< |
if (++prePassCnt > maxPreDistrib) { |
| 436 |
< |
sprintf(errmsg, "too many prepasses"); |
| 437 |
< |
|
| 438 |
< |
for (t = 0; t < NUM_PMAP_TYPES; t++) |
| 439 |
< |
if (pmaps [t] && !pmaps [t] -> heapEnd) { |
| 440 |
< |
sprintf(errmsg2, ", no %s photons stored", pmapName [t]); |
| 441 |
< |
strcat(errmsg, errmsg2); |
| 442 |
< |
} |
| 443 |
< |
|
| 444 |
< |
error(USER, errmsg); |
| 445 |
< |
break; |
| 446 |
< |
} |
| 447 |
< |
|
| 448 |
< |
/* Num to emit is fraction of minimum target count */ |
| 449 |
< |
numEmit = FHUGE; |
| 375 |
> |
/* MAIN LOOP */ |
| 376 |
> |
for (proc = 0; proc < numProc; proc++) { |
| 377 |
> |
if (!(pid = fork())) { |
| 378 |
> |
/* SUBPROCESS ENTERS HERE. |
| 379 |
> |
All opened and memory mapped files are inherited */ |
| 380 |
> |
unsigned passCnt = 0, prePassCnt = 0; |
| 381 |
> |
unsigned long lastNumPhotons [NUM_PMAP_TYPES]; |
| 382 |
> |
unsigned long localNumEmitted = 0; /* Num photons emitted by this |
| 383 |
> |
subprocess alone */ |
| 384 |
|
|
| 385 |
< |
for (t = 0; t < NUM_PMAP_TYPES; t++) |
| 386 |
< |
if (pmaps [t]) |
| 387 |
< |
numEmit = min(pmaps [t] -> distribTarget, numEmit); |
| 388 |
< |
|
| 389 |
< |
numEmit *= preDistrib; |
| 390 |
< |
} |
| 391 |
< |
|
| 458 |
< |
else { |
| 459 |
< |
/* INIT PASS 2 */ |
| 460 |
< |
/* Based on the outcome of the predistribution we can now estimate |
| 461 |
< |
* how many more photons we have to emit for each photon map to |
| 462 |
< |
* meet its respective target count. This value is clamped to 0 in |
| 463 |
< |
* case the target has already been exceeded in the pass 1. Note |
| 464 |
< |
* repProgress is the number of photons emitted thus far, while |
| 465 |
< |
* heapEnd is the number of photons stored in each photon map. */ |
| 466 |
< |
double maxDistribRatio = 0; |
| 467 |
< |
|
| 468 |
< |
/* Set the distribution ratio for each map; this indicates how many |
| 469 |
< |
* photons of each respective type are stored per emitted photon, |
| 470 |
< |
* and is used as probability for storing a photon by addPhoton(). |
| 471 |
< |
* Since this biases the photon density, addPhoton() promotes the |
| 472 |
< |
* flux of stored photons to compensate. */ |
| 473 |
< |
for (t = 0; t < NUM_PMAP_TYPES; t++) |
| 474 |
< |
if ((pm = pmaps [t])) { |
| 475 |
< |
pm -> distribRatio = (double)pm -> distribTarget / |
| 476 |
< |
pm -> heapEnd - 1; |
| 477 |
< |
|
| 478 |
< |
/* Check if photon map "overflowed", i.e. exceeded its target |
| 479 |
< |
* count in the prepass; correcting the photon flux via the |
| 480 |
< |
* distribution ratio is no longer possible, as no more |
| 481 |
< |
* photons of this type will be stored, so notify the user |
| 482 |
< |
* rather than deliver incorrect results. |
| 483 |
< |
* In future we should handle this more intelligently by |
| 484 |
< |
* using the photonFlux in each photon map to individually |
| 485 |
< |
* correct the flux after distribution. */ |
| 486 |
< |
if (pm -> distribRatio <= FTINY) { |
| 487 |
< |
sprintf(errmsg, |
| 488 |
< |
"%s photon map overflow in prepass, reduce -apD", |
| 489 |
< |
pmapName [t]); |
| 490 |
< |
error(INTERNAL, errmsg); |
| 491 |
< |
} |
| 385 |
> |
/* Seed RNGs from PID for decorellated photon distribution */ |
| 386 |
> |
pmapSeed(randSeed + proc, partState); |
| 387 |
> |
pmapSeed(randSeed + proc, emitState); |
| 388 |
> |
pmapSeed(randSeed + proc, cntState); |
| 389 |
> |
pmapSeed(randSeed + proc, mediumState); |
| 390 |
> |
pmapSeed(randSeed + proc, scatterState); |
| 391 |
> |
pmapSeed(randSeed + proc, rouletteState); |
| 392 |
|
|
| 493 |
– |
maxDistribRatio = max(pm -> distribRatio, maxDistribRatio); |
| 494 |
– |
} |
| 495 |
– |
|
| 496 |
– |
/* Normalise distribution ratios and calculate number of photons to |
| 497 |
– |
* emit in main pass */ |
| 393 |
|
for (t = 0; t < NUM_PMAP_TYPES; t++) |
| 394 |
< |
if ((pm = pmaps [t])) |
| 395 |
< |
pm -> distribRatio /= maxDistribRatio; |
| 396 |
< |
|
| 397 |
< |
if ((numEmit = repProgress * maxDistribRatio) < FTINY) |
| 398 |
< |
/* No photons left to distribute in main pass */ |
| 399 |
< |
break; |
| 400 |
< |
} |
| 401 |
< |
|
| 402 |
< |
/* Set completion count for progress report */ |
| 508 |
< |
repComplete = numEmit + repProgress; |
| 509 |
< |
|
| 510 |
< |
/* PHOTON DISTRIBUTION LOOP */ |
| 511 |
< |
for (srcIdx = 0; srcIdx < nsources; srcIdx++) { |
| 512 |
< |
unsigned portCnt = 0; |
| 513 |
< |
emap.src = source + srcIdx; |
| 514 |
< |
|
| 394 |
> |
lastNumPhotons [t] = 0; |
| 395 |
> |
|
| 396 |
> |
/* ============================================================= |
| 397 |
> |
* 2-PASS PHOTON DISTRIBUTION |
| 398 |
> |
* Pass 1 (pre): emit fraction of target photon count |
| 399 |
> |
* Pass 2 (main): based on outcome of pass 1, estimate remaining |
| 400 |
> |
* number of photons to emit to approximate target |
| 401 |
> |
* count |
| 402 |
> |
* ============================================================= */ |
| 403 |
|
do { |
| 404 |
< |
emap.port = emap.src -> sflags & SDISTANT ? photonPorts + portCnt |
| 517 |
< |
: NULL; |
| 518 |
< |
photonPartition [emap.src -> so -> otype] (&emap); |
| 404 |
> |
double numEmit; |
| 405 |
|
|
| 406 |
< |
if (photonRepTime) { |
| 407 |
< |
if (!passCnt) |
| 408 |
< |
sprintf(errmsg, "PREPASS %d on source %s ", |
| 409 |
< |
prePassCnt, source [srcIdx].so -> oname); |
| 410 |
< |
else |
| 411 |
< |
sprintf(errmsg, "MAIN PASS on source %s ", |
| 412 |
< |
source [srcIdx].so -> oname); |
| 413 |
< |
|
| 414 |
< |
if (emap.port) { |
| 415 |
< |
sprintf(errmsg2, "via port %s ", |
| 416 |
< |
photonPorts [portCnt].so -> oname); |
| 417 |
< |
strcat(errmsg, errmsg2); |
| 406 |
> |
if (!passCnt) { |
| 407 |
> |
/* INIT PASS 1 */ |
| 408 |
> |
/* Skip if no photons contributed after sufficient |
| 409 |
> |
* iterations; make it clear to user which photon maps are |
| 410 |
> |
* missing so (s)he can check geometry and materials */ |
| 411 |
> |
if (++prePassCnt > maxPreDistrib) { |
| 412 |
> |
sprintf(errmsg, |
| 413 |
> |
"proc %d, source %s: too many prepasses", |
| 414 |
> |
proc, source [srcIdx].so -> oname); |
| 415 |
> |
|
| 416 |
> |
for (t = 0; t < NUM_PMAP_TYPES; t++) |
| 417 |
> |
if (pmaps [t] && !pmaps [t] -> numPhotons) { |
| 418 |
> |
sprintf(errmsg2, ", no %s photons stored", |
| 419 |
> |
pmapName [t]); |
| 420 |
> |
strcat(errmsg, errmsg2); |
| 421 |
> |
} |
| 422 |
> |
|
| 423 |
> |
error(USER, errmsg); |
| 424 |
> |
break; |
| 425 |
|
} |
| 426 |
+ |
|
| 427 |
+ |
/* Num to emit is fraction of minimum target count */ |
| 428 |
+ |
numEmit = FHUGE; |
| 429 |
|
|
| 430 |
< |
sprintf(errmsg2, "(%lu partitions)...\n", emap.numPartitions); |
| 431 |
< |
strcat(errmsg, errmsg2); |
| 432 |
< |
eputs(errmsg); |
| 433 |
< |
fflush(stderr); |
| 430 |
> |
for (t = 0; t < NUM_PMAP_TYPES; t++) |
| 431 |
> |
if (pmaps [t]) |
| 432 |
> |
numEmit = min(pmaps [t] -> distribTarget, numEmit); |
| 433 |
> |
|
| 434 |
> |
numEmit *= preDistrib; |
| 435 |
|
} |
| 436 |
< |
|
| 437 |
< |
for (emap.partitionCnt = 0; emap.partitionCnt < emap.numPartitions; |
| 438 |
< |
emap.partitionCnt++) { |
| 439 |
< |
double partNumEmit; |
| 440 |
< |
unsigned long partEmitCnt; |
| 436 |
> |
else { |
| 437 |
> |
/* INIT PASS 2 */ |
| 438 |
> |
/* Based on the outcome of the predistribution we can now |
| 439 |
> |
* estimate how many more photons we have to emit for each |
| 440 |
> |
* photon map to meet its respective target count. This |
| 441 |
> |
* value is clamped to 0 in case the target has already been |
| 442 |
> |
* exceeded in the pass 1. */ |
| 443 |
> |
double maxDistribRatio = 0; |
| 444 |
> |
|
| 445 |
> |
/* Set the distribution ratio for each map; this indicates |
| 446 |
> |
* how many photons of each respective type are stored per |
| 447 |
> |
* emitted photon, and is used as probability for storing a |
| 448 |
> |
* photon by newPhoton(). Since this biases the photon |
| 449 |
> |
* density, newPhoton() promotes the flux of stored photons |
| 450 |
> |
* to compensate. */ |
| 451 |
> |
for (t = 0; t < NUM_PMAP_TYPES; t++) |
| 452 |
> |
if ((pm = pmaps [t])) { |
| 453 |
> |
pm -> distribRatio = (double)pm -> distribTarget / |
| 454 |
> |
pm -> numPhotons - 1; |
| 455 |
> |
|
| 456 |
> |
/* Check if photon map "overflowed", i.e. exceeded its |
| 457 |
> |
* target count in the prepass; correcting the photon |
| 458 |
> |
* flux via the distribution ratio is no longer |
| 459 |
> |
* possible, as no more photons of this type will be |
| 460 |
> |
* stored, so notify the user rather than deliver |
| 461 |
> |
* incorrect results. In future we should handle this |
| 462 |
> |
* more intelligently by using the photonFlux in each |
| 463 |
> |
* photon map to individually correct the flux after |
| 464 |
> |
* distribution. */ |
| 465 |
> |
if (pm -> distribRatio <= FTINY) { |
| 466 |
> |
sprintf(errmsg, "%s photon map overflow in " |
| 467 |
> |
"prepass, reduce -apD", pmapName [t]); |
| 468 |
> |
error(INTERNAL, errmsg); |
| 469 |
> |
} |
| 470 |
> |
|
| 471 |
> |
maxDistribRatio = max(pm -> distribRatio, |
| 472 |
> |
maxDistribRatio); |
| 473 |
> |
} |
| 474 |
|
|
| 475 |
< |
/* Get photon origin within current source partishunn and |
| 476 |
< |
* build emission map */ |
| 477 |
< |
photonOrigin [emap.src -> so -> otype] (&emap); |
| 478 |
< |
initPhotonEmission(&emap, pdfSamples); |
| 479 |
< |
|
| 480 |
< |
/* Number of photons to emit from ziss partishunn -- |
| 481 |
< |
* proportional to flux; photon ray weight and scalar flux |
| 482 |
< |
* are uniform (the latter only varying in RGB). */ |
| 483 |
< |
partNumEmit = numEmit * colorAvg(emap.partFlux) / totalFlux; |
| 484 |
< |
partEmitCnt = (unsigned long)partNumEmit; |
| 555 |
< |
|
| 556 |
< |
/* Probabilistically account for fractional photons */ |
| 557 |
< |
if (pmapRandom(cntState) < partNumEmit - partEmitCnt) |
| 558 |
< |
partEmitCnt++; |
| 475 |
> |
/* Normalise distribution ratios and calculate number of |
| 476 |
> |
* photons to emit in main pass */ |
| 477 |
> |
for (t = 0; t < NUM_PMAP_TYPES; t++) |
| 478 |
> |
if ((pm = pmaps [t])) |
| 479 |
> |
pm -> distribRatio /= maxDistribRatio; |
| 480 |
> |
|
| 481 |
> |
if ((numEmit = localNumEmitted * maxDistribRatio) < FTINY) |
| 482 |
> |
/* No photons left to distribute in main pass */ |
| 483 |
> |
break; |
| 484 |
> |
} |
| 485 |
|
|
| 486 |
< |
/* Integer counter avoids FP rounding errors */ |
| 487 |
< |
while (partEmitCnt--) { |
| 488 |
< |
RAY photonRay; |
| 486 |
> |
/* Update shared completion counter for prog.report by parent */ |
| 487 |
> |
photonCnt -> numComplete += numEmit; |
| 488 |
> |
|
| 489 |
> |
/* PHOTON DISTRIBUTION LOOP */ |
| 490 |
> |
for (srcIdx = 0; srcIdx < nsources; srcIdx++) { |
| 491 |
> |
unsigned portCnt = 0; |
| 492 |
> |
emap.src = source + srcIdx; |
| 493 |
> |
|
| 494 |
> |
do { /* Need at least one iteration if no ports! */ |
| 495 |
> |
emap.port = emap.src -> sflags & SDISTANT |
| 496 |
> |
? photonPorts + portCnt : NULL; |
| 497 |
> |
photonPartition [emap.src -> so -> otype] (&emap); |
| 498 |
> |
|
| 499 |
> |
if (photonRepTime && !proc) { |
| 500 |
> |
if (!passCnt) |
| 501 |
> |
sprintf(errmsg, "PREPASS %d on source %s ", |
| 502 |
> |
prePassCnt, source [srcIdx].so -> oname); |
| 503 |
> |
else |
| 504 |
> |
sprintf(errmsg, "MAIN PASS on source %s ", |
| 505 |
> |
source [srcIdx].so -> oname); |
| 506 |
> |
|
| 507 |
> |
if (emap.port) { |
| 508 |
> |
sprintf(errmsg2, "via port %s ", |
| 509 |
> |
photonPorts [portCnt].so -> oname); |
| 510 |
> |
strcat(errmsg, errmsg2); |
| 511 |
> |
} |
| 512 |
> |
|
| 513 |
> |
sprintf(errmsg2, "(%lu partitions)\n", |
| 514 |
> |
emap.numPartitions); |
| 515 |
> |
strcat(errmsg, errmsg2); |
| 516 |
> |
eputs(errmsg); |
| 517 |
> |
fflush(stderr); |
| 518 |
> |
} |
| 519 |
|
|
| 520 |
< |
/* Emit photon based on PDF and trace through scene until |
| 521 |
< |
* absorbed/leaked */ |
| 522 |
< |
emitPhoton(&emap, &photonRay); |
| 523 |
< |
tracePhoton(&photonRay); |
| 520 |
> |
for (emap.partitionCnt = 0; emap.partitionCnt < emap.numPartitions; |
| 521 |
> |
emap.partitionCnt++) { |
| 522 |
> |
double partNumEmit; |
| 523 |
> |
unsigned long partEmitCnt; |
| 524 |
> |
|
| 525 |
> |
/* Get photon origin within current source partishunn |
| 526 |
> |
* and build emission map */ |
| 527 |
> |
photonOrigin [emap.src -> so -> otype] (&emap); |
| 528 |
> |
initPhotonEmission(&emap, pdfSamples); |
| 529 |
> |
|
| 530 |
> |
/* Number of photons to emit from ziss partishunn -- |
| 531 |
> |
* proportional to flux; photon ray weight and scalar |
| 532 |
> |
* flux are uniform (the latter only varying in RGB). |
| 533 |
> |
* */ |
| 534 |
> |
partNumEmit = numEmit * colorAvg(emap.partFlux) / |
| 535 |
> |
totalFlux; |
| 536 |
> |
partEmitCnt = (unsigned long)partNumEmit; |
| 537 |
> |
|
| 538 |
> |
/* Probabilistically account for fractional photons */ |
| 539 |
> |
if (pmapRandom(cntState) < partNumEmit - partEmitCnt) |
| 540 |
> |
partEmitCnt++; |
| 541 |
> |
|
| 542 |
> |
/* Update local and shared (global) emission counter */ |
| 543 |
> |
photonCnt -> numEmitted += partEmitCnt; |
| 544 |
> |
localNumEmitted += partEmitCnt; |
| 545 |
> |
|
| 546 |
> |
/* Integer counter avoids FP rounding errors during |
| 547 |
> |
* iteration */ |
| 548 |
> |
while (partEmitCnt--) { |
| 549 |
> |
RAY photonRay; |
| 550 |
> |
|
| 551 |
> |
/* Emit photon based on PDF and trace through scene |
| 552 |
> |
* until absorbed/leaked */ |
| 553 |
> |
emitPhoton(&emap, &photonRay); |
| 554 |
> |
tracePhoton(&photonRay); |
| 555 |
> |
} |
| 556 |
> |
|
| 557 |
> |
/* Update shared global photon count for each pmap */ |
| 558 |
> |
for (t = 0; t < NUM_PMAP_TYPES; t++) |
| 559 |
> |
if (pmaps [t]) { |
| 560 |
> |
photonCnt -> numPhotons [t] += |
| 561 |
> |
pmaps [t] -> numPhotons - lastNumPhotons [t]; |
| 562 |
> |
lastNumPhotons [t] = pmaps [t] -> numPhotons; |
| 563 |
> |
} |
| 564 |
> |
} |
| 565 |
|
|
| 566 |
< |
/* Record progress */ |
| 567 |
< |
repProgress++; |
| 568 |
< |
|
| 569 |
< |
if (photonRepTime > 0 && |
| 570 |
< |
time(NULL) >= repLastTime + photonRepTime) |
| 571 |
< |
pmapDistribReport(); |
| 572 |
< |
#ifdef SIGCONT |
| 573 |
< |
else signal(SIGCONT, pmapDistribReport); |
| 574 |
< |
#endif |
| 566 |
> |
portCnt++; |
| 567 |
> |
} while (portCnt < numPhotonPorts); |
| 568 |
> |
} |
| 569 |
> |
|
| 570 |
> |
for (t = 0; t < NUM_PMAP_TYPES; t++) |
| 571 |
> |
if (pmaps [t] && !pmaps [t] -> numPhotons) { |
| 572 |
> |
/* Double preDistrib in case a photon map is empty and |
| 573 |
> |
* redo pass 1 --> possibility of infinite loop for |
| 574 |
> |
* pathological scenes (e.g. absorbing materials) */ |
| 575 |
> |
preDistrib *= 2; |
| 576 |
> |
break; |
| 577 |
|
} |
| 578 |
+ |
|
| 579 |
+ |
if (t >= NUM_PMAP_TYPES) { |
| 580 |
+ |
/* No empty photon maps found; now do pass 2 */ |
| 581 |
+ |
passCnt++; |
| 582 |
+ |
#if 0 |
| 583 |
+ |
if (photonRepTime) |
| 584 |
+ |
eputs("\n"); |
| 585 |
+ |
#endif |
| 586 |
|
} |
| 587 |
< |
|
| 588 |
< |
portCnt++; |
| 589 |
< |
} while (portCnt < numPhotonPorts); |
| 587 |
> |
} while (passCnt < 2); |
| 588 |
> |
|
| 589 |
> |
/* Unmap shared photon counters */ |
| 590 |
> |
#if 0 |
| 591 |
> |
munmap(photonCnt, sizeof(*photonCnt)); |
| 592 |
> |
close(shmFile); |
| 593 |
> |
#endif |
| 594 |
> |
|
| 595 |
> |
/* Flush heap buffa for every pmap one final time; this is required |
| 596 |
> |
* to prevent data corruption! */ |
| 597 |
> |
for (t = 0; t < NUM_PMAP_TYPES; t++) |
| 598 |
> |
if (pmaps [t]) { |
| 599 |
> |
#if 0 |
| 600 |
> |
eputs("Final flush\n"); |
| 601 |
> |
#endif |
| 602 |
> |
flushPhotonHeap(pmaps [t]); |
| 603 |
> |
fclose(pmaps [t] -> heap); |
| 604 |
> |
#ifdef DEBUG_PMAP |
| 605 |
> |
sprintf(errmsg, "Proc %d: total %ld photons\n", getpid(), |
| 606 |
> |
pmaps [t] -> numPhotons); |
| 607 |
> |
eputs(errmsg); |
| 608 |
> |
#endif |
| 609 |
> |
} |
| 610 |
> |
|
| 611 |
> |
exit(0); |
| 612 |
|
} |
| 613 |
+ |
else if (pid < 0) |
| 614 |
+ |
error(SYSTEM, "failed to fork subprocess in distribPhotons"); |
| 615 |
+ |
} |
| 616 |
+ |
|
| 617 |
+ |
/* PARENT PROCESS CONTINUES HERE */ |
| 618 |
+ |
/* Record start time and enable progress report signal handler */ |
| 619 |
+ |
repStartTime = time(NULL); |
| 620 |
+ |
#ifdef SIGCONT |
| 621 |
+ |
signal(SIGCONT, pmapDistribReport); |
| 622 |
+ |
#endif |
| 623 |
+ |
|
| 624 |
+ |
if (photonRepTime) |
| 625 |
+ |
eputs("\n"); |
| 626 |
+ |
|
| 627 |
+ |
/* Wait for subprocesses to complete while reporting progress */ |
| 628 |
+ |
proc = numProc; |
| 629 |
+ |
while (proc) { |
| 630 |
+ |
while (waitpid(-1, &stat, WNOHANG) > 0) { |
| 631 |
+ |
/* Subprocess exited; check status */ |
| 632 |
+ |
if (!WIFEXITED(stat) || WEXITSTATUS(stat)) |
| 633 |
+ |
error(USER, "failed photon distribution"); |
| 634 |
|
|
| 635 |
+ |
--proc; |
| 636 |
+ |
} |
| 637 |
+ |
|
| 638 |
+ |
/* Nod off for a bit and update progress */ |
| 639 |
+ |
sleep(1); |
| 640 |
+ |
/* Update progress report from shared subprocess counters */ |
| 641 |
+ |
repEmitted = repProgress = photonCnt -> numEmitted; |
| 642 |
+ |
repComplete = photonCnt -> numComplete; |
| 643 |
+ |
|
| 644 |
|
for (t = 0; t < NUM_PMAP_TYPES; t++) |
| 645 |
< |
if (pmaps [t] && !pmaps [t] -> heapEnd) { |
| 646 |
< |
/* Double preDistrib in case a photon map is empty and redo |
| 647 |
< |
* pass 1 --> possibility of infinite loop for pathological |
| 648 |
< |
* scenes (e.g. absorbing materials) */ |
| 649 |
< |
preDistrib *= 2; |
| 650 |
< |
break; |
| 645 |
> |
if ((pm = pmaps [t])) { |
| 646 |
> |
#if 0 |
| 647 |
> |
/* Get photon count from heapfile size for progress update */ |
| 648 |
> |
fseek(pm -> heap, 0, SEEK_END); |
| 649 |
> |
pm -> numPhotons = ftell(pm -> heap) / sizeof(Photon); */ |
| 650 |
> |
#else |
| 651 |
> |
/* Get global photon count from shmem updated by subprocs */ |
| 652 |
> |
pm -> numPhotons = photonCnt -> numPhotons [t]; |
| 653 |
> |
#endif |
| 654 |
|
} |
| 593 |
– |
|
| 594 |
– |
if (t >= NUM_PMAP_TYPES) { |
| 595 |
– |
/* No empty photon maps found; now do pass 2 */ |
| 596 |
– |
passCnt++; |
| 597 |
– |
if (photonRepTime) |
| 598 |
– |
eputs("\n"); |
| 599 |
– |
} |
| 600 |
– |
} while (passCnt < 2); |
| 655 |
|
|
| 656 |
+ |
if (photonRepTime > 0 && time(NULL) >= repLastTime + photonRepTime) |
| 657 |
+ |
pmapDistribReport(); |
| 658 |
+ |
#ifdef SIGCONT |
| 659 |
+ |
else signal(SIGCONT, pmapDistribReport); |
| 660 |
+ |
#endif |
| 661 |
+ |
} |
| 662 |
+ |
|
| 663 |
|
/* =================================================================== |
| 664 |
< |
* POST-DISTRIBUTION - Set photon flux and build kd-tree, etc. |
| 664 |
> |
* POST-DISTRIBUTION - Set photon flux and build data struct for photon |
| 665 |
> |
* storage, etc. |
| 666 |
|
* =================================================================== */ |
| 667 |
< |
#ifdef SIGCONT |
| 668 |
< |
signal(SIGCONT, SIG_DFL); |
| 669 |
< |
#endif |
| 667 |
> |
#ifdef SIGCONT |
| 668 |
> |
signal(SIGCONT, SIG_DFL); |
| 669 |
> |
#endif |
| 670 |
|
free(emap.samples); |
| 671 |
|
|
| 672 |
|
/* Set photon flux (repProgress is total num emitted) */ |
| 673 |
< |
totalFlux /= repProgress; |
| 673 |
> |
totalFlux /= photonCnt -> numEmitted; |
| 674 |
|
|
| 675 |
+ |
/* Photon counters no longer needed, unmap shared memory */ |
| 676 |
+ |
munmap(photonCnt, sizeof(*photonCnt)); |
| 677 |
+ |
close(shmFile); |
| 678 |
+ |
#if 0 |
| 679 |
+ |
shm_unlink(shmFname); |
| 680 |
+ |
#else |
| 681 |
+ |
unlink(shmFname); |
| 682 |
+ |
#endif |
| 683 |
+ |
|
| 684 |
|
for (t = 0; t < NUM_PMAP_TYPES; t++) |
| 685 |
|
if (pmaps [t]) { |
| 686 |
|
if (photonRepTime) { |
| 688 |
|
eputs(errmsg); |
| 689 |
|
fflush(stderr); |
| 690 |
|
} |
| 691 |
< |
|
| 692 |
< |
balancePhotons(pmaps [t], &totalFlux); |
| 691 |
> |
|
| 692 |
> |
/* Build underlying data structure; heap is destroyed */ |
| 693 |
> |
buildPhotonMap(pmaps [t], &totalFlux, NULL, numProc); |
| 694 |
|
} |
| 695 |
< |
|
| 695 |
> |
|
| 696 |
|
/* Precompute photon irradiance if necessary */ |
| 697 |
|
if (preCompPmap) |
| 698 |
|
preComputeGlobal(preCompPmap); |
| 627 |
– |
} |
| 628 |
– |
|
| 629 |
– |
|
| 630 |
– |
|
| 631 |
– |
void photonDensity (PhotonMap *pmap, RAY *ray, COLOR irrad) |
| 632 |
– |
/* Photon density estimate. Returns irradiance at ray -> rop. */ |
| 633 |
– |
{ |
| 634 |
– |
unsigned i; |
| 635 |
– |
PhotonSQNode *sq; |
| 636 |
– |
float r; |
| 637 |
– |
COLOR flux; |
| 638 |
– |
|
| 639 |
– |
setcolor(irrad, 0, 0, 0); |
| 640 |
– |
|
| 641 |
– |
if (!pmap -> maxGather) |
| 642 |
– |
return; |
| 643 |
– |
|
| 644 |
– |
/* Ignore sources */ |
| 645 |
– |
if (ray -> ro) |
| 646 |
– |
if (islight(objptr(ray -> ro -> omod) -> otype)) |
| 647 |
– |
return; |
| 648 |
– |
|
| 649 |
– |
pmap -> squeueEnd = 0; |
| 650 |
– |
findPhotons(pmap, ray); |
| 651 |
– |
|
| 652 |
– |
/* Need at least 2 photons */ |
| 653 |
– |
if (pmap -> squeueEnd < 2) { |
| 654 |
– |
#ifdef PMAP_NONEFOUND |
| 655 |
– |
sprintf(errmsg, "no photons found on %s at (%.3f, %.3f, %.3f)", |
| 656 |
– |
ray -> ro ? ray -> ro -> oname : "<null>", |
| 657 |
– |
ray -> rop [0], ray -> rop [1], ray -> rop [2]); |
| 658 |
– |
error(WARNING, errmsg); |
| 659 |
– |
#endif |
| 660 |
– |
|
| 661 |
– |
return; |
| 662 |
– |
} |
| 663 |
– |
|
| 664 |
– |
if (pmap -> minGather == pmap -> maxGather) { |
| 665 |
– |
/* No bias compensation. Just do a plain vanilla estimate */ |
| 666 |
– |
sq = pmap -> squeue + 1; |
| 667 |
– |
|
| 668 |
– |
/* Average radius between furthest two photons to improve accuracy */ |
| 669 |
– |
r = max(sq -> dist, (sq + 1) -> dist); |
| 670 |
– |
r = 0.25 * (pmap -> maxDist + r + 2 * sqrt(pmap -> maxDist * r)); |
| 671 |
– |
|
| 672 |
– |
/* Skip the extra photon */ |
| 673 |
– |
for (i = 1 ; i < pmap -> squeueEnd; i++, sq++) { |
| 674 |
– |
getPhotonFlux(sq -> photon, flux); |
| 675 |
– |
#ifdef PMAP_EPANECHNIKOV |
| 676 |
– |
/* Apply Epanechnikov kernel to photon flux (dists are squared) */ |
| 677 |
– |
scalecolor(flux, 2 * (1 - sq -> dist / r)); |
| 678 |
– |
#endif |
| 679 |
– |
addcolor(irrad, flux); |
| 680 |
– |
} |
| 681 |
– |
|
| 682 |
– |
/* Divide by search area PI * r^2, 1 / PI required as ambient |
| 683 |
– |
normalisation factor */ |
| 684 |
– |
scalecolor(irrad, 1 / (PI * PI * r)); |
| 685 |
– |
|
| 686 |
– |
return; |
| 687 |
– |
} |
| 688 |
– |
else |
| 689 |
– |
/* Apply bias compensation to density estimate */ |
| 690 |
– |
biasComp(pmap, irrad); |
| 691 |
– |
} |
| 692 |
– |
|
| 693 |
– |
|
| 694 |
– |
|
| 695 |
– |
void photonPreCompDensity (PhotonMap *pmap, RAY *r, COLOR irrad) |
| 696 |
– |
/* Returns precomputed photon density estimate at ray -> rop. */ |
| 697 |
– |
{ |
| 698 |
– |
Photon *p; |
| 699 |
– |
|
| 700 |
– |
setcolor(irrad, 0, 0, 0); |
| 701 |
– |
|
| 702 |
– |
/* Ignore sources */ |
| 703 |
– |
if (r -> ro && islight(objptr(r -> ro -> omod) -> otype)) |
| 704 |
– |
return; |
| 705 |
– |
|
| 706 |
– |
if ((p = find1Photon(preCompPmap, r))) |
| 707 |
– |
getPhotonFlux(p, irrad); |
| 708 |
– |
} |
| 709 |
– |
|
| 710 |
– |
|
| 711 |
– |
|
| 712 |
– |
void volumePhotonDensity (PhotonMap *pmap, RAY *ray, COLOR irrad) |
| 713 |
– |
/* Photon volume density estimate. Returns irradiance at ray -> rop. */ |
| 714 |
– |
{ |
| 715 |
– |
unsigned i; |
| 716 |
– |
PhotonSQNode *sq; |
| 717 |
– |
float gecc2, r, ph; |
| 718 |
– |
COLOR flux; |
| 719 |
– |
|
| 720 |
– |
setcolor(irrad, 0, 0, 0); |
| 721 |
– |
|
| 722 |
– |
if (!pmap -> maxGather) |
| 723 |
– |
return; |
| 724 |
– |
|
| 725 |
– |
pmap -> squeueEnd = 0; |
| 726 |
– |
findPhotons(pmap, ray); |
| 727 |
– |
|
| 728 |
– |
/* Need at least 2 photons */ |
| 729 |
– |
if (pmap -> squeueEnd < 2) |
| 730 |
– |
return; |
| 731 |
– |
|
| 732 |
– |
if (pmap -> minGather == pmap -> maxGather) { |
| 733 |
– |
/* No bias compensation. Just do a plain vanilla estimate */ |
| 734 |
– |
gecc2 = ray -> gecc * ray -> gecc; |
| 735 |
– |
sq = pmap -> squeue + 1; |
| 736 |
– |
|
| 737 |
– |
/* Average radius between furthest two photons to improve accuracy */ |
| 738 |
– |
r = max(sq -> dist, (sq + 1) -> dist); |
| 739 |
– |
r = 0.25 * (pmap -> maxDist + r + 2 * sqrt(pmap -> maxDist * r)); |
| 740 |
– |
|
| 741 |
– |
/* Skip the extra photon */ |
| 742 |
– |
for (i = 1 ; i < pmap -> squeueEnd; i++, sq++) { |
| 743 |
– |
/* Compute phase function for inscattering from photon */ |
| 744 |
– |
if (gecc2 <= FTINY) |
| 745 |
– |
ph = 1; |
| 746 |
– |
else { |
| 747 |
– |
ph = DOT(ray -> rdir, sq -> photon -> norm) / 127; |
| 748 |
– |
ph = 1 + gecc2 - 2 * ray -> gecc * ph; |
| 749 |
– |
ph = (1 - gecc2) / (ph * sqrt(ph)); |
| 750 |
– |
} |
| 751 |
– |
|
| 752 |
– |
getPhotonFlux(sq -> photon, flux); |
| 753 |
– |
scalecolor(flux, ph); |
| 754 |
– |
addcolor(irrad, flux); |
| 755 |
– |
} |
| 756 |
– |
|
| 757 |
– |
/* Divide by search volume 4 / 3 * PI * r^3 and phase function |
| 758 |
– |
normalization factor 1 / (4 * PI) */ |
| 759 |
– |
scalecolor(irrad, 3 / (16 * PI * PI * r * sqrt(r))); |
| 760 |
– |
|
| 761 |
– |
return; |
| 762 |
– |
} |
| 763 |
– |
|
| 764 |
– |
else |
| 765 |
– |
/* Apply bias compensation to density estimate */ |
| 766 |
– |
volumeBiasComp(pmap, ray, irrad); |
| 699 |
|
} |
