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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 support for light source contributions |
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====================================================================== |
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Photon map support for building light source contributions |
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Roland Schregle (roland.schregle@{hslu.ch, gmail.com}) |
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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 "pmapcontrib.h" |
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#include "pmap.h" |
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#include "pmapmat.h" |
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#include "pmapsrc.h" |
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#include "pmaprand.h" |
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#include "pmapdiag.h" |
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#include "rcontrib.h" |
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#include "otypes.h" |
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#include <sys/mman.h> |
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#include <sys/wait.h> |
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static void setPmapContribParams (PhotonMap *pmap, LUTAB *srcContrib) |
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/* Set parameters for light source contributions */ |
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static PhotonPrimaryIdx newPhotonPrimary (PhotonMap *pmap, |
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const RAY *primRay, |
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FILE *primHeap) |
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/* Add primary ray for emitted photon and save light source index, origin on |
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* source, and emitted direction; used by contrib photons. The current |
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* primary is stored in pmap -> lastPrimary. If the previous primary |
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* contributed photons (has srcIdx >= 0), it's appended to primHeap. If |
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* primRay == NULL, the current primary is still flushed, but no new primary |
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* is set. Returns updated primary counter pmap -> numPrimary. */ |
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{ |
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/* Set light source modifier list and appropriate callback to extract |
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* their contributions from the photon map */ |
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if (pmap) { |
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pmap -> srcContrib = srcContrib; |
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pmap -> lookup = photonContrib; |
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/* Ensure we get all requested photon contribs during lookups */ |
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pmap -> gatherTolerance = 1.0; |
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if (!pmap || !primHeap) |
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return 0; |
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|
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/* Check if last primary ray has spawned photons (srcIdx >= 0, see |
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* newPhoton()), in which case we write it to the primary heap file |
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* before overwriting it */ |
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if (pmap -> lastPrimary.srcIdx >= 0) { |
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if (!fwrite(&pmap -> lastPrimary, sizeof(PhotonPrimary), 1, primHeap)) |
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error(SYSTEM, "failed writing photon primary in newPhotonPrimary"); |
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|
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pmap -> numPrimary++; |
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if (pmap -> numPrimary > PMAP_MAXPRIMARY) |
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error(INTERNAL, "photon primary overflow in newPhotonPrimary"); |
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} |
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} |
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static void checkPmapContribs (const PhotonMap *pmap, LUTAB *srcContrib) |
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/* Check modifiers for light source contributions */ |
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{ |
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const PhotonPrimary *primary = pmap -> primary; |
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OBJREC *srcMod; |
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unsigned long i, found = 0; |
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|
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/* Make sure at least one of the modifiers is actually in the pmap, |
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* otherwise findPhotons() winds up in an infinite loop! */ |
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for (i = pmap -> primarySize; i; --i, ++primary) { |
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if (primary -> srcIdx < 0 || primary -> srcIdx >= nsources) |
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error(INTERNAL, "invalid light source index in photon map"); |
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|
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srcMod = findmaterial(source [primary -> srcIdx].so); |
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if ((MODCONT*)lu_find(srcContrib, srcMod -> oname) -> data) |
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++found; |
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/* Mark unused with negative source index until path spawns a photon (see |
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* newPhoton()) */ |
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pmap -> lastPrimary.srcIdx = -1; |
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|
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if (primRay) { |
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FVECT dvec; |
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|
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/* Reverse incident direction to point to light source */ |
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dvec [0] = -primRay -> rdir [0]; |
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dvec [1] = -primRay -> rdir [1]; |
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dvec [2] = -primRay -> rdir [2]; |
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pmap -> lastPrimary.dir = encodedir(dvec); |
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#ifdef PMAP_PRIMARYPOS |
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VCOPY(pmap -> lastPrimary.pos, primRay -> rop); |
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#endif |
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} |
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if (!found) |
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error(USER, "modifiers not in photon map"); |
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return pmap -> numPrimary; |
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} |
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|
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|
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void initPmapContrib (LUTAB *srcContrib, unsigned numSrcContrib) |
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|
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|
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#ifdef DEBUG_PMAP_CONTRIB |
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static int checkPrimaryHeap (FILE *file) |
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/* Check heap for ordered primaries */ |
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{ |
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unsigned t; |
| 82 |
> |
Photon p, lastp; |
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int i, dup; |
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|
| 85 |
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for (t = 0; t < NUM_PMAP_TYPES; t++) |
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if (photonMaps [t] && t != PMAP_TYPE_CONTRIB) { |
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sprintf(errmsg, "%s photon map does not support contributions", |
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pmapName [t]); |
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error(USER, errmsg); |
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} |
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rewind(file); |
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> |
memset(&lastp, 0, sizeof(lastp)); |
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/* Get params */ |
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setPmapContribParams(contribPmap, srcContrib); |
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|
| 91 |
< |
if (contribPhotonMapping) { |
| 92 |
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if (contribPmap -> maxGather < numSrcContrib) { |
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/* Adjust density estimate bandwidth if lower than modifier |
| 94 |
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* count, otherwise contributions are missing */ |
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error(WARNING, "contrib density estimate bandwidth too low, " |
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"adjusting to modifier count"); |
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contribPmap -> maxGather = numSrcContrib; |
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while (fread(&p, sizeof(p), 1, file)) { |
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dup = 1; |
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|
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for (i = 0; i <= 2; i++) { |
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if (p.pos [i] < thescene.cuorg [i] || |
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p.pos [i] > thescene.cuorg [i] + thescene.cusize) { |
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|
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sprintf(errmsg, "corrupt photon in heap at [%f, %f, %f]\n", |
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p.pos [0], p.pos [1], p.pos [2]); |
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error(WARNING, errmsg); |
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} |
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dup &= p.pos [i] == lastp.pos [i]; |
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} |
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/* Sanity check */ |
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checkPmapContribs(contribPmap, srcContrib); |
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> |
if (dup) { |
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sprintf(errmsg, |
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"consecutive duplicate photon in heap at [%f, %f, %f]\n", |
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p.pos [0], p.pos [1], p.pos [2]); |
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error(WARNING, errmsg); |
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} |
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} |
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|
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return 0; |
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} |
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#endif |
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void photonContrib (PhotonMap *pmap, RAY *ray, COLOR irrad) |
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/* Sum up light source contributions from photons in pmap->srcContrib */ |
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> |
static PhotonPrimaryIdx buildPrimaries (PhotonMap *pmap, FILE **primaryHeap, |
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PhotonPrimaryIdx *primaryOfs, |
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unsigned numHeaps) |
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/* Consolidate per-subprocess photon primary heaps into the primary array |
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* pmap -> primaries. Returns offset for primary index linearisation in |
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* numPrimary. The heap files in primaryHeap are closed on return. */ |
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{ |
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unsigned i; |
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PhotonSQNode *sq; |
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float r, invArea; |
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RREAL rayCoeff [3]; |
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setcolor(irrad, 0, 0, 0); |
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|
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< |
if (!pmap -> maxGather) |
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return; |
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PhotonPrimaryIdx heapLen; |
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> |
unsigned heap; |
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> |
|
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> |
if (!pmap || !primaryHeap || !primaryOfs || !numHeaps) |
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return 0; |
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/* Ignore sources */ |
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if (ray -> ro) |
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if (islight(objptr(ray -> ro -> omod) -> otype)) |
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return; |
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pmap -> numPrimary = 0; |
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|
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for (heap = 0; heap < numHeaps; heap++) { |
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primaryOfs [heap] = pmap -> numPrimary; |
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|
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if (fseek(primaryHeap [heap], 0, SEEK_END)) |
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error(SYSTEM, "failed photon primary seek in buildPrimaries"); |
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pmap -> numPrimary += heapLen = ftell(primaryHeap [heap]) / |
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sizeof(PhotonPrimary); |
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/* Get cumulative path |
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* coefficient up to photon lookup point */ |
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raycontrib(rayCoeff, ray, PRIMARY); |
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pmap -> primaries = realloc(pmap -> primaries, |
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pmap -> numPrimary * |
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sizeof(PhotonPrimary)); |
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if (!pmap -> primaries) |
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error(SYSTEM, "failed photon primary alloc in buildPrimaries"); |
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< |
/* Lookup photons */ |
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< |
pmap -> squeueEnd = 0; |
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< |
findPhotons(pmap, ray); |
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< |
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< |
/* Need at least 2 photons */ |
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< |
if (pmap -> squeueEnd < 2) { |
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< |
#ifdef PMAP_NONEFOUND |
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< |
sprintf(errmsg, "no photons found on %s at (%.3f, %.3f, %.3f)", |
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< |
ray -> ro ? ray -> ro -> oname : "<null>", |
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ray -> rop [0], ray -> rop [1], ray -> rop [2]); |
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error(WARNING, errmsg); |
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< |
#endif |
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rewind(primaryHeap [heap]); |
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> |
if (fread(pmap -> primaries + primaryOfs [heap], sizeof(PhotonPrimary), |
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> |
heapLen, primaryHeap [heap]) != heapLen) |
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> |
error(SYSTEM, "failed reading photon primaries in buildPrimaries"); |
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< |
return; |
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> |
fclose(primaryHeap [heap]); |
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} |
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|
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/* Average (squared) radius between furthest two photons to improve |
| 136 |
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* accuracy and get inverse search area 1 / (PI * r^2), with extra |
| 137 |
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* normalisation factor 1 / PI for ambient calculation */ |
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sq = pmap -> squeue + 1; |
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r = max(sq -> dist, (sq + 1) -> dist); |
| 140 |
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r = 0.25 * (pmap -> maxDist + r + 2 * sqrt(pmap -> maxDist * r)); |
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invArea = 1 / (PI * PI * r); |
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|
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< |
/* Skip the extra photon */ |
| 155 |
< |
for (i = 1 ; i < pmap -> squeueEnd; i++, sq++) { |
| 145 |
< |
COLOR flux; |
| 146 |
< |
|
| 147 |
< |
/* Get photon's contribution to density estimate */ |
| 148 |
< |
getPhotonFlux(sq -> photon, flux); |
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< |
scalecolor(flux, invArea); |
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< |
#ifdef PMAP_EPANECHNIKOV |
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< |
/* Apply Epanechnikov kernel to photon flux (dists are squared) */ |
| 152 |
< |
scalecolor(flux, 2 * (1 - sq -> dist / r)); |
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< |
#endif |
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< |
addcolor(irrad, flux); |
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< |
|
| 156 |
< |
if (pmap -> srcContrib) { |
| 157 |
< |
const PhotonPrimary *primary = pmap -> primary + |
| 158 |
< |
sq -> photon -> primary; |
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< |
const SRCREC *sp = &source[primary -> srcIdx]; |
| 160 |
< |
OBJREC *srcMod = findmaterial(sp -> so); |
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< |
MODCONT *srcContrib = (MODCONT*)lu_find(pmap -> srcContrib, |
| 162 |
< |
srcMod -> oname) -> data; |
| 163 |
< |
if (!srcContrib) |
| 164 |
< |
continue; |
| 154 |
> |
return pmap -> numPrimary; |
| 155 |
> |
} |
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|
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/* Photon's emitting light source has modifier whose |
| 167 |
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* contributions are sought */ |
| 168 |
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double srcBinReal; |
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int srcBin; |
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– |
RAY srcRay; |
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|
| 172 |
– |
if (srcContrib -> binv -> type != NUM) { |
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– |
/* Use intersection function to set shadow ray parameters |
| 174 |
– |
* if it's not simply a constant |
| 175 |
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*/ |
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– |
rayorigin(&srcRay, SHADOW, NULL, NULL); |
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– |
srcRay.rsrc = primary -> srcIdx; |
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– |
VCOPY(srcRay.rorg, primary -> pos); |
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– |
decodedir(srcRay.rdir, primary -> dir); |
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|
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< |
if (!(sp->sflags & SDISTANT ? sourcehit(&srcRay) |
| 160 |
< |
: (*ofun[sp -> so -> otype].funp)(sp -> so, &srcRay))) |
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< |
continue; /* XXX shouldn't happen! */ |
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> |
/* Defs for photon emission counter array passed by sub-processes to parent |
| 160 |
> |
* via shared memory */ |
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> |
typedef unsigned long PhotonContribCnt; |
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|
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< |
worldfunc(RCCONTEXT, &srcRay); |
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< |
set_eparams((char *)srcContrib -> params); |
| 165 |
< |
} |
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> |
/* Indices for photon emission counter array: num photons stored and num |
| 164 |
> |
* emitted per source */ |
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> |
#define PHOTONCNT_NUMPHOT 0 |
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> |
#define PHOTONCNT_NUMEMIT(n) (1 + n) |
| 167 |
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|
| 189 |
– |
if ((srcBinReal = evalue(srcContrib -> binv)) < -.5) |
| 190 |
– |
continue; /* silently ignore negative bins */ |
| 191 |
– |
|
| 192 |
– |
if ((srcBin = srcBinReal + .5) >= srcContrib -> nbins) { |
| 193 |
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error(WARNING, "bad bin number (ignored)"); |
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– |
continue; |
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} |
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|
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if (!contrib) { |
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/* Ray coefficient mode; normalise by light source radiance |
| 199 |
– |
* after applying distrib pattern */ |
| 200 |
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int j; |
| 201 |
– |
raytexture(ray, srcMod -> omod); |
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setcolor(ray -> rcol, srcMod -> oargs.farg [0], |
| 203 |
– |
srcMod -> oargs.farg [1], srcMod -> oargs.farg [2]); |
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– |
multcolor(ray -> rcol, ray -> pcol); |
| 205 |
– |
for (j = 0; j < 3; j++) |
| 206 |
– |
flux [j] = ray -> rcol [j] ? flux [j] / ray -> rcol [j] |
| 207 |
– |
: 0; |
| 208 |
– |
} |
| 209 |
– |
|
| 210 |
– |
multcolor(flux, rayCoeff); |
| 211 |
– |
addcolor(srcContrib -> cbin [srcBin], flux); |
| 212 |
– |
} |
| 213 |
– |
} |
| 214 |
– |
|
| 215 |
– |
return; |
| 216 |
– |
} |
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|
| 169 |
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|
| 170 |
< |
|
| 220 |
< |
void distribPhotonContrib (PhotonMap* pm) |
| 170 |
> |
void distribPhotonContrib (PhotonMap* pm, unsigned numProc) |
| 171 |
|
{ |
| 172 |
< |
EmissionMap emap; |
| 173 |
< |
char errmsg2 [128]; |
| 174 |
< |
unsigned srcIdx; |
| 175 |
< |
double *srcFlux; /* Emitted flux per light source */ |
| 176 |
< |
const double srcDistribTarget = /* Target photon count per source */ |
| 177 |
< |
nsources ? (double)pm -> distribTarget / nsources : 0; |
| 178 |
< |
|
| 172 |
> |
EmissionMap emap; |
| 173 |
> |
char errmsg2 [128], shmFname [255]; |
| 174 |
> |
unsigned srcIdx, proc; |
| 175 |
> |
int shmFile, stat, pid; |
| 176 |
> |
double *srcFlux, /* Emitted flux per light source */ |
| 177 |
> |
srcDistribTarget; /* Target photon count per source */ |
| 178 |
> |
PhotonContribCnt *photonCnt; /* Photon emission counter array */ |
| 179 |
> |
const unsigned photonCntSize = sizeof(PhotonContribCnt) * |
| 180 |
> |
PHOTONCNT_NUMEMIT(nsources); |
| 181 |
> |
FILE *primaryHeap [numProc]; |
| 182 |
> |
PhotonPrimaryIdx primaryOfs [numProc]; |
| 183 |
> |
|
| 184 |
|
if (!pm) |
| 185 |
< |
error(USER, "no photon map defined"); |
| 185 |
> |
error(USER, "no photon map defined in distribPhotonContrib"); |
| 186 |
|
|
| 187 |
|
if (!nsources) |
| 188 |
< |
error(USER, "no light sources"); |
| 189 |
< |
|
| 188 |
> |
error(USER, "no light sources in distribPhotonContrib"); |
| 189 |
> |
|
| 190 |
> |
if (nsources > MAXMODLIST) |
| 191 |
> |
error(USER, "too many light sources in distribPhotonContrib"); |
| 192 |
> |
|
| 193 |
|
/* Allocate photon flux per light source; this differs for every |
| 194 |
|
* source as all sources contribute the same number of distributed |
| 195 |
|
* photons (srcDistribTarget), hence the number of photons emitted per |
| 196 |
|
* source does not correlate with its emitted flux. The resulting flux |
| 197 |
|
* per photon is therefore adjusted individually for each source. */ |
| 198 |
|
if (!(srcFlux = calloc(nsources, sizeof(double)))) |
| 199 |
< |
error(SYSTEM, "cannot allocate source flux"); |
| 199 |
> |
error(SYSTEM, "can't allocate source flux in distribPhotonContrib"); |
| 200 |
|
|
| 201 |
< |
/* ================================================================ |
| 202 |
< |
* INITIALISASHUNN - Set up emisshunn and scattering funcs |
| 203 |
< |
* ================================================================ */ |
| 201 |
> |
/* =================================================================== |
| 202 |
> |
* INITIALISATION - Set up emission and scattering funcs |
| 203 |
> |
* =================================================================== */ |
| 204 |
|
emap.samples = NULL; |
| 205 |
|
emap.src = NULL; |
| 206 |
|
emap.maxPartitions = MAXSPART; |
| 207 |
|
emap.partitions = (unsigned char*)malloc(emap.maxPartitions >> 1); |
| 208 |
|
if (!emap.partitions) |
| 209 |
< |
error(USER, "can't allocate source partitions"); |
| 209 |
> |
error(USER, "can't allocate source partitions in distribPhotonContrib"); |
| 210 |
|
|
| 211 |
+ |
/* Initialise contrib photon map */ |
| 212 |
|
initPhotonMap(pm, PMAP_TYPE_CONTRIB); |
| 213 |
+ |
initPhotonHeap(pm); |
| 214 |
|
initPhotonEmissionFuncs(); |
| 215 |
|
initPhotonScatterFuncs(); |
| 216 |
|
|
| 217 |
+ |
/* Per-subprocess / per-source target counts */ |
| 218 |
+ |
pm -> distribTarget /= numProc; |
| 219 |
+ |
srcDistribTarget = nsources ? (double)pm -> distribTarget / nsources : 0; |
| 220 |
+ |
|
| 221 |
|
/* Get photon ports if specified */ |
| 222 |
|
if (ambincl == 1) |
| 223 |
|
getPhotonPorts(); |
| 225 |
|
/* Get photon sensor modifiers */ |
| 226 |
|
getPhotonSensors(photonSensorList); |
| 227 |
|
|
| 228 |
< |
/* Seed RNGs for photon distribution */ |
| 229 |
< |
pmapSeed(randSeed, partState); |
| 230 |
< |
pmapSeed(randSeed, emitState); |
| 231 |
< |
pmapSeed(randSeed, cntState); |
| 232 |
< |
pmapSeed(randSeed, mediumState); |
| 233 |
< |
pmapSeed(randSeed, scatterState); |
| 234 |
< |
pmapSeed(randSeed, rouletteState); |
| 235 |
< |
|
| 272 |
< |
/* Record start time and enable progress report signal handler */ |
| 273 |
< |
repStartTime = time(NULL); |
| 274 |
< |
#ifdef SIGCONT |
| 275 |
< |
signal(SIGCONT, pmapDistribReport); |
| 276 |
< |
#endif |
| 228 |
> |
/* Set up shared mem for photon counters (zeroed by ftruncate) */ |
| 229 |
> |
#if 0 |
| 230 |
> |
snprintf(shmFname, 255, PMAP_SHMFNAME, getpid()); |
| 231 |
> |
shmFile = shm_open(shmFname, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR); |
| 232 |
> |
#else |
| 233 |
> |
strcpy(shmFname, PMAP_SHMFNAME); |
| 234 |
> |
shmFile = mkstemp(shmFname); |
| 235 |
> |
#endif |
| 236 |
|
|
| 237 |
< |
for (srcIdx = 0; srcIdx < nsources; srcIdx++) { |
| 238 |
< |
unsigned portCnt = 0, passCnt = 0, prePassCnt = 0; |
| 280 |
< |
double srcNumEmit = 0; /* # photons to emit from source */ |
| 281 |
< |
unsigned long srcNumDistrib = pm -> heapEnd; /* # photons stored */ |
| 237 |
> |
if (shmFile < 0 || ftruncate(shmFile, photonCntSize) < 0) |
| 238 |
> |
error(SYSTEM, "failed shared mem init in distribPhotonContrib"); |
| 239 |
|
|
| 240 |
< |
srcFlux [srcIdx] = repProgress = 0; |
| 240 |
> |
photonCnt = mmap(NULL, photonCntSize, PROT_READ | PROT_WRITE, |
| 241 |
> |
MAP_SHARED, shmFile, 0); |
| 242 |
> |
|
| 243 |
> |
if (photonCnt == MAP_FAILED) |
| 244 |
> |
error(SYSTEM, "failed shared mem mapping in distribPhotonContrib"); |
| 245 |
> |
|
| 246 |
> |
/* ============================================================= |
| 247 |
> |
* FLUX INTEGRATION - Get total flux emitted from light source |
| 248 |
> |
* ============================================================= */ |
| 249 |
> |
for (srcIdx = 0; srcIdx < nsources; srcIdx++) { |
| 250 |
> |
unsigned portCnt = 0; |
| 251 |
> |
|
| 252 |
> |
srcFlux [srcIdx] = 0; |
| 253 |
|
emap.src = source + srcIdx; |
| 254 |
|
|
| 255 |
|
if (photonRepTime) |
| 256 |
|
eputs("\n"); |
| 257 |
< |
|
| 258 |
< |
/* ============================================================= |
| 259 |
< |
* FLUX INTEGRATION - Get total flux emitted from light source |
| 260 |
< |
* ============================================================= */ |
| 292 |
< |
do { |
| 293 |
< |
emap.port = emap.src -> sflags & SDISTANT |
| 294 |
< |
? photonPorts + portCnt : NULL; |
| 257 |
> |
|
| 258 |
> |
do { /* Need at least one iteration if no ports! */ |
| 259 |
> |
emap.port = emap.src -> sflags & SDISTANT ? photonPorts + portCnt |
| 260 |
> |
: NULL; |
| 261 |
|
photonPartition [emap.src -> so -> otype] (&emap); |
| 262 |
|
|
| 263 |
|
if (photonRepTime) { |
| 271 |
|
strcat(errmsg, errmsg2); |
| 272 |
|
} |
| 273 |
|
|
| 274 |
< |
sprintf(errmsg2, "(%lu partitions)...\n", |
| 309 |
< |
emap.numPartitions); |
| 274 |
> |
sprintf(errmsg2, "(%lu partitions)...\n", emap.numPartitions); |
| 275 |
|
strcat(errmsg, errmsg2); |
| 276 |
|
eputs(errmsg); |
| 277 |
|
fflush(stderr); |
| 278 |
|
} |
| 279 |
|
|
| 280 |
< |
for (emap.partitionCnt = 0; |
| 316 |
< |
emap.partitionCnt < emap.numPartitions; |
| 280 |
> |
for (emap.partitionCnt = 0; emap.partitionCnt < emap.numPartitions; |
| 281 |
|
emap.partitionCnt++) { |
| 282 |
|
initPhotonEmission(&emap, pdfSamples); |
| 283 |
|
srcFlux [srcIdx] += colorAvg(emap.partFlux); |
| 284 |
|
} |
| 285 |
|
|
| 286 |
|
portCnt++; |
| 287 |
< |
} while (portCnt < numPhotonPorts); |
| 288 |
< |
|
| 287 |
> |
} while (portCnt < numPhotonPorts); |
| 288 |
> |
|
| 289 |
|
if (srcFlux [srcIdx] < FTINY) { |
| 290 |
|
sprintf(errmsg, "source %s has zero emission", |
| 291 |
|
source [srcIdx].so -> oname); |
| 292 |
|
error(WARNING, errmsg); |
| 293 |
|
} |
| 294 |
< |
else { |
| 295 |
< |
/* ========================================================== |
| 294 |
> |
} |
| 295 |
> |
|
| 296 |
> |
if (photonRepTime) |
| 297 |
> |
eputs("\n"); |
| 298 |
> |
|
| 299 |
> |
/* Init per-subprocess primary heap files */ |
| 300 |
> |
for (proc = 0; proc < numProc; proc++) |
| 301 |
> |
if (!(primaryHeap [proc] = tmpfile())) |
| 302 |
> |
error(SYSTEM, "failed opening primary heap file in " |
| 303 |
> |
"distribPhotonContrib"); |
| 304 |
> |
|
| 305 |
> |
/* MAIN LOOP */ |
| 306 |
> |
for (proc = 0; proc < numProc; proc++) { |
| 307 |
> |
if (!(pid = fork())) { |
| 308 |
> |
/* SUBPROCESS ENTERS HERE; |
| 309 |
> |
* all opened and memory mapped files are inherited */ |
| 310 |
> |
|
| 311 |
> |
/* Local photon counters for this subprocess */ |
| 312 |
> |
unsigned long lastNumPhotons = 0, localNumEmitted = 0; |
| 313 |
> |
double photonFluxSum = 0; /* Running photon flux sum */ |
| 314 |
> |
|
| 315 |
> |
/* Seed RNGs from PID for decorellated photon distribution */ |
| 316 |
> |
pmapSeed(randSeed + proc, partState); |
| 317 |
> |
pmapSeed(randSeed + proc, emitState); |
| 318 |
> |
pmapSeed(randSeed + proc, cntState); |
| 319 |
> |
pmapSeed(randSeed + proc, mediumState); |
| 320 |
> |
pmapSeed(randSeed + proc, scatterState); |
| 321 |
> |
pmapSeed(randSeed + proc, rouletteState); |
| 322 |
> |
|
| 323 |
> |
/* ============================================================= |
| 324 |
|
* 2-PASS PHOTON DISTRIBUTION |
| 325 |
|
* Pass 1 (pre): emit fraction of target photon count |
| 326 |
< |
* Pass 2 (main): based on outcome of pass 1, estimate |
| 327 |
< |
* remaining number of photons to emit to |
| 328 |
< |
* approximate target count |
| 329 |
< |
* ========================================================== */ |
| 330 |
< |
do { |
| 331 |
< |
if (!passCnt) { |
| 332 |
< |
/* INIT PASS 1 */ |
| 333 |
< |
if (++prePassCnt > maxPreDistrib) { |
| 334 |
< |
/* Warn if no photons contributed after sufficient |
| 335 |
< |
* iterations */ |
| 336 |
< |
sprintf(errmsg, "too many prepasses, no photons " |
| 337 |
< |
"from source %s", source [srcIdx].so -> oname); |
| 338 |
< |
error(WARNING, errmsg); |
| 339 |
< |
break; |
| 326 |
> |
* Pass 2 (main): based on outcome of pass 1, estimate remaining |
| 327 |
> |
* number of photons to emit to approximate target |
| 328 |
> |
* count |
| 329 |
> |
* ============================================================= */ |
| 330 |
> |
for (srcIdx = 0; srcIdx < nsources; srcIdx++) { |
| 331 |
> |
unsigned portCnt, passCnt = 0, prePassCnt = 0; |
| 332 |
> |
float srcPreDistrib = preDistrib; |
| 333 |
> |
double srcNumEmit = 0; /* # to emit from source */ |
| 334 |
> |
unsigned long srcNumDistrib = pm -> numPhotons; /* # stored */ |
| 335 |
> |
|
| 336 |
> |
if (srcFlux [srcIdx] < FTINY) |
| 337 |
> |
continue; |
| 338 |
> |
|
| 339 |
> |
while (passCnt < 2) { |
| 340 |
> |
if (!passCnt) { |
| 341 |
> |
/* INIT PASS 1 */ |
| 342 |
> |
if (++prePassCnt > maxPreDistrib) { |
| 343 |
> |
/* Warn if no photons contributed after sufficient |
| 344 |
> |
* iterations */ |
| 345 |
> |
sprintf(errmsg, "proc %d, source %s: " |
| 346 |
> |
"too many prepasses, skipped", |
| 347 |
> |
proc, source [srcIdx].so -> oname); |
| 348 |
> |
error(WARNING, errmsg); |
| 349 |
> |
break; |
| 350 |
> |
} |
| 351 |
> |
|
| 352 |
> |
/* Num to emit is fraction of target count */ |
| 353 |
> |
srcNumEmit = srcPreDistrib * srcDistribTarget; |
| 354 |
|
} |
| 355 |
< |
|
| 356 |
< |
/* Num to emit is fraction of target count */ |
| 357 |
< |
srcNumEmit = preDistrib * srcDistribTarget; |
| 358 |
< |
} |
| 355 |
> |
else { |
| 356 |
> |
/* INIT PASS 2 */ |
| 357 |
> |
double srcPhotonFlux, avgPhotonFlux; |
| 358 |
> |
|
| 359 |
> |
/* Based on the outcome of the predistribution we can now |
| 360 |
> |
* figure out how many more photons we have to emit from |
| 361 |
> |
* the current source to meet the target count, |
| 362 |
> |
* srcDistribTarget. This value is clamped to 0 in case |
| 363 |
> |
* the target has already been exceeded in pass 1. |
| 364 |
> |
* srcNumEmit and srcNumDistrib is the number of photons |
| 365 |
> |
* emitted and distributed (stored) from the current |
| 366 |
> |
* source in pass 1, respectively. */ |
| 367 |
> |
srcNumDistrib = pm -> numPhotons - srcNumDistrib; |
| 368 |
> |
srcNumEmit *= srcNumDistrib |
| 369 |
> |
? max(srcDistribTarget/srcNumDistrib, 1) - 1 |
| 370 |
> |
: 0; |
| 371 |
|
|
| 372 |
< |
else { |
| 373 |
< |
/* INIT PASS 2 */ |
| 374 |
< |
/* Based on the outcome of the predistribution we can now |
| 357 |
< |
* figure out how many more photons we have to emit from |
| 358 |
< |
* the current source to meet the target count, |
| 359 |
< |
* srcDistribTarget. This value is clamped to 0 in case |
| 360 |
< |
* the target has already been exceeded in pass 1. |
| 361 |
< |
* srcNumEmit and srcNumDistrib is the number of photons |
| 362 |
< |
* emitted and distributed (stored) from the current |
| 363 |
< |
* source in pass 1, respectively. */ |
| 364 |
< |
srcNumDistrib = pm -> heapEnd - srcNumDistrib; |
| 365 |
< |
srcNumEmit *= srcNumDistrib |
| 366 |
< |
? max(srcDistribTarget/srcNumDistrib, 1) - 1 |
| 367 |
< |
: 0; |
| 368 |
< |
|
| 369 |
< |
if (!srcNumEmit) |
| 370 |
< |
/* No photons left to distribute in main pass */ |
| 371 |
< |
break; |
| 372 |
< |
} |
| 373 |
< |
|
| 374 |
< |
/* Set completion count for progress report */ |
| 375 |
< |
repComplete = srcNumEmit + repProgress; |
| 376 |
< |
portCnt = 0; |
| 372 |
> |
if (!srcNumEmit) |
| 373 |
> |
/* No photons left to distribute in main pass */ |
| 374 |
> |
break; |
| 375 |
|
|
| 376 |
< |
do { |
| 377 |
< |
emap.port = emap.src -> sflags & SDISTANT |
| 380 |
< |
? photonPorts + portCnt : NULL; |
| 381 |
< |
photonPartition [emap.src -> so -> otype] (&emap); |
| 382 |
< |
|
| 383 |
< |
if (photonRepTime) { |
| 384 |
< |
if (!passCnt) |
| 385 |
< |
sprintf(errmsg, "PREPASS %d on source %s (mod %s) ", |
| 386 |
< |
prePassCnt, source [srcIdx].so -> oname, |
| 387 |
< |
objptr(source[srcIdx].so->omod) -> oname); |
| 388 |
< |
else |
| 389 |
< |
sprintf(errmsg, "MAIN PASS on source %s (mod %s) ", |
| 390 |
< |
source [srcIdx].so -> oname, |
| 391 |
< |
objptr(source[srcIdx].so->omod) -> oname); |
| 392 |
< |
|
| 393 |
< |
if (emap.port) { |
| 394 |
< |
sprintf(errmsg2, "via port %s ", |
| 395 |
< |
photonPorts [portCnt].so -> oname); |
| 396 |
< |
strcat(errmsg, errmsg2); |
| 397 |
< |
} |
| 376 |
> |
srcPhotonFlux = srcFlux [srcIdx] / srcNumEmit; |
| 377 |
> |
avgPhotonFlux = photonFluxSum / (srcIdx + 1); |
| 378 |
|
|
| 379 |
< |
sprintf(errmsg2, "(%lu partitions)...\n", |
| 380 |
< |
emap.numPartitions); |
| 381 |
< |
strcat(errmsg, errmsg2); |
| 382 |
< |
eputs(errmsg); |
| 383 |
< |
fflush(stderr); |
| 379 |
> |
if (avgPhotonFlux > 0 && |
| 380 |
> |
srcPhotonFlux / avgPhotonFlux < FTINY) { |
| 381 |
> |
/* Skip source if its photon flux is grossly below the |
| 382 |
> |
* running average, indicating negligible contribs at |
| 383 |
> |
* the expense of excessive distribution time */ |
| 384 |
> |
sprintf(errmsg, "proc %d, source %s: " |
| 385 |
> |
"itsy bitsy photon flux, skipped", |
| 386 |
> |
proc, source [srcIdx].so -> oname); |
| 387 |
> |
error(WARNING, errmsg); |
| 388 |
> |
srcNumEmit = 0; |
| 389 |
> |
} |
| 390 |
> |
|
| 391 |
> |
/* Update sum of photon flux per light source */ |
| 392 |
> |
photonFluxSum += srcPhotonFlux; |
| 393 |
|
} |
| 394 |
|
|
| 395 |
< |
for (emap.partitionCnt = 0; |
| 396 |
< |
emap.partitionCnt < emap.numPartitions; |
| 397 |
< |
emap.partitionCnt++) { |
| 398 |
< |
double partNumEmit; |
| 399 |
< |
unsigned long partEmitCnt; |
| 395 |
> |
portCnt = 0; |
| 396 |
> |
do { /* Need at least one iteration if no ports! */ |
| 397 |
> |
emap.src = source + srcIdx; |
| 398 |
> |
emap.port = emap.src -> sflags & SDISTANT |
| 399 |
> |
? photonPorts + portCnt : NULL; |
| 400 |
> |
photonPartition [emap.src -> so -> otype] (&emap); |
| 401 |
|
|
| 402 |
< |
/* Get photon origin within current source partishunn |
| 403 |
< |
* and build emission map */ |
| 404 |
< |
photonOrigin [emap.src -> so -> otype] (&emap); |
| 405 |
< |
initPhotonEmission(&emap, pdfSamples); |
| 406 |
< |
|
| 407 |
< |
/* Number of photons to emit from ziss partishunn; |
| 408 |
< |
* scale according to its normalised contribushunn to |
| 409 |
< |
* the emitted source flux */ |
| 410 |
< |
partNumEmit = srcNumEmit * colorAvg(emap.partFlux) / |
| 411 |
< |
srcFlux [srcIdx]; |
| 412 |
< |
partEmitCnt = (unsigned long)partNumEmit; |
| 413 |
< |
|
| 414 |
< |
/* Probabilistically account for fractional photons */ |
| 415 |
< |
if (pmapRandom(cntState) < partNumEmit - partEmitCnt) |
| 416 |
< |
partEmitCnt++; |
| 402 |
> |
if (photonRepTime && !proc) { |
| 403 |
> |
if (!passCnt) |
| 404 |
> |
sprintf(errmsg, "PREPASS %d on source %s (mod %s) ", |
| 405 |
> |
prePassCnt, source [srcIdx].so -> oname, |
| 406 |
> |
objptr(source[srcIdx].so->omod) -> oname); |
| 407 |
> |
else |
| 408 |
> |
sprintf(errmsg, "MAIN PASS on source %s (mod %s) ", |
| 409 |
> |
source [srcIdx].so -> oname, |
| 410 |
> |
objptr(source[srcIdx].so->omod) -> oname); |
| 411 |
> |
|
| 412 |
> |
if (emap.port) { |
| 413 |
> |
sprintf(errmsg2, "via port %s ", |
| 414 |
> |
photonPorts [portCnt].so -> oname); |
| 415 |
> |
strcat(errmsg, errmsg2); |
| 416 |
> |
} |
| 417 |
|
|
| 418 |
< |
/* Integer counter avoids FP rounding errors */ |
| 419 |
< |
while (partEmitCnt--) { |
| 420 |
< |
RAY photonRay; |
| 418 |
> |
sprintf(errmsg2, "(%lu partitions)\n", |
| 419 |
> |
emap.numPartitions); |
| 420 |
> |
strcat(errmsg, errmsg2); |
| 421 |
> |
eputs(errmsg); |
| 422 |
> |
fflush(stderr); |
| 423 |
> |
} |
| 424 |
|
|
| 425 |
< |
/* Emit photon according to PDF (if any), allocate |
| 426 |
< |
* associated primary ray, and trace through scene |
| 427 |
< |
* until absorbed/leaked */ |
| 428 |
< |
emitPhoton(&emap, &photonRay); |
| 436 |
< |
addPhotonPrimary(pm, &photonRay); |
| 437 |
< |
tracePhoton(&photonRay); |
| 425 |
> |
for (emap.partitionCnt = 0; emap.partitionCnt < emap.numPartitions; |
| 426 |
> |
emap.partitionCnt++) { |
| 427 |
> |
double partNumEmit; |
| 428 |
> |
unsigned long partEmitCnt; |
| 429 |
|
|
| 430 |
< |
/* Record progress */ |
| 431 |
< |
repProgress++; |
| 430 |
> |
/* Get photon origin within current source partishunn |
| 431 |
> |
* and build emission map */ |
| 432 |
> |
photonOrigin [emap.src -> so -> otype] (&emap); |
| 433 |
> |
initPhotonEmission(&emap, pdfSamples); |
| 434 |
|
|
| 435 |
< |
if (photonRepTime > 0 && |
| 436 |
< |
time(NULL) >= repLastTime + photonRepTime) |
| 437 |
< |
pmapDistribReport(); |
| 438 |
< |
#ifdef SIGCONT |
| 439 |
< |
else signal(SIGCONT, pmapDistribReport); |
| 440 |
< |
#endif |
| 435 |
> |
/* Number of photons to emit from ziss partishunn; |
| 436 |
> |
* scale according to its normalised contribushunn to |
| 437 |
> |
* the emitted source flux */ |
| 438 |
> |
partNumEmit = srcNumEmit * colorAvg(emap.partFlux) / |
| 439 |
> |
srcFlux [srcIdx]; |
| 440 |
> |
partEmitCnt = (unsigned long)partNumEmit; |
| 441 |
> |
|
| 442 |
> |
/* Probabilistically account for fractional photons */ |
| 443 |
> |
if (pmapRandom(cntState) < partNumEmit - partEmitCnt) |
| 444 |
> |
partEmitCnt++; |
| 445 |
> |
|
| 446 |
> |
/* Update local and shared global emission counter */ |
| 447 |
> |
localNumEmitted += partEmitCnt; |
| 448 |
> |
photonCnt [PHOTONCNT_NUMEMIT(srcIdx)] += partEmitCnt; |
| 449 |
> |
|
| 450 |
> |
/* Integer counter avoids FP rounding errors */ |
| 451 |
> |
while (partEmitCnt--) { |
| 452 |
> |
RAY photonRay; |
| 453 |
> |
|
| 454 |
> |
/* Emit photon according to PDF (if any), allocate |
| 455 |
> |
* associated primary ray, and trace through scene |
| 456 |
> |
* until absorbed/leaked; emitPhoton() sets the |
| 457 |
> |
* emitting light source index in photonRay */ |
| 458 |
> |
emitPhoton(&emap, &photonRay); |
| 459 |
> |
newPhotonPrimary(pm, &photonRay, primaryHeap[proc]); |
| 460 |
> |
/* Set subprocess index in photonRay for post- |
| 461 |
> |
* distrib primary index linearisation; this is |
| 462 |
> |
* propagated with the primary index in photonRay |
| 463 |
> |
* and set for photon hits by newPhoton() */ |
| 464 |
> |
PMAP_SETRAYPROC(&photonRay, proc); |
| 465 |
> |
tracePhoton(&photonRay); |
| 466 |
> |
} |
| 467 |
> |
|
| 468 |
> |
/* Update shared global photon count */ |
| 469 |
> |
photonCnt [PHOTONCNT_NUMPHOT] += pm -> numPhotons - |
| 470 |
> |
lastNumPhotons; |
| 471 |
> |
lastNumPhotons = pm -> numPhotons; |
| 472 |
|
} |
| 449 |
– |
} |
| 450 |
– |
|
| 451 |
– |
portCnt++; |
| 452 |
– |
} while (portCnt < numPhotonPorts); |
| 473 |
|
|
| 474 |
< |
if (pm -> heapEnd == srcNumDistrib) |
| 475 |
< |
/* Double preDistrib in case no photons were stored |
| 476 |
< |
* for this source and redo pass 1 */ |
| 477 |
< |
preDistrib *= 2; |
| 478 |
< |
else { |
| 479 |
< |
/* Now do pass 2 */ |
| 480 |
< |
passCnt++; |
| 481 |
< |
if (photonRepTime) |
| 482 |
< |
eputs("\n"); |
| 474 |
> |
portCnt++; |
| 475 |
> |
} while (portCnt < numPhotonPorts); |
| 476 |
> |
|
| 477 |
> |
if (pm -> numPhotons == srcNumDistrib) |
| 478 |
> |
/* Double predistrib factor in case no photons were stored |
| 479 |
> |
* for this source and redo pass 1 */ |
| 480 |
> |
srcPreDistrib *= 2; |
| 481 |
> |
else { |
| 482 |
> |
/* Now do pass 2 */ |
| 483 |
> |
passCnt++; |
| 484 |
> |
/* if (photonRepTime) |
| 485 |
> |
eputs("\n"); */ |
| 486 |
> |
} |
| 487 |
|
} |
| 488 |
< |
} while (passCnt < 2); |
| 488 |
> |
} |
| 489 |
> |
|
| 490 |
> |
/* Flush heap buffa one final time to prevent data corruption */ |
| 491 |
> |
flushPhotonHeap(pm); |
| 492 |
> |
fclose(pm -> heap); |
| 493 |
|
|
| 494 |
< |
/* Flux per photon emitted from this source; repProgress is the |
| 495 |
< |
* number of emitted photons after both passes */ |
| 496 |
< |
srcFlux [srcIdx] = repProgress ? srcFlux [srcIdx] / repProgress |
| 497 |
< |
: 0; |
| 494 |
> |
/* Flush final photon primary to primary heap file */ |
| 495 |
> |
newPhotonPrimary(pm, NULL, primaryHeap [proc]); |
| 496 |
> |
fclose(primaryHeap [proc]); |
| 497 |
> |
|
| 498 |
> |
#ifdef DEBUG_PMAP |
| 499 |
> |
sprintf(errmsg, "Proc %d exited with total %ld photons\n", proc, |
| 500 |
> |
pm -> numPhotons); |
| 501 |
> |
eputs(errmsg); |
| 502 |
> |
#endif |
| 503 |
> |
|
| 504 |
> |
exit(0); |
| 505 |
|
} |
| 506 |
+ |
else if (pid < 0) |
| 507 |
+ |
error(SYSTEM, "failed to fork subprocess in distribPhotonContrib"); |
| 508 |
|
} |
| 509 |
|
|
| 510 |
+ |
/* PARENT PROCESS CONTINUES HERE */ |
| 511 |
+ |
/* Record start time and enable progress report signal handler */ |
| 512 |
+ |
repStartTime = time(NULL); |
| 513 |
+ |
#ifdef SIGCONT |
| 514 |
+ |
signal(SIGCONT, pmapDistribReport); |
| 515 |
+ |
#endif |
| 516 |
+ |
/* |
| 517 |
+ |
if (photonRepTime) |
| 518 |
+ |
eputs("\n"); */ |
| 519 |
+ |
|
| 520 |
+ |
/* Wait for subprocesses to complete while reporting progress */ |
| 521 |
+ |
proc = numProc; |
| 522 |
+ |
while (proc) { |
| 523 |
+ |
while (waitpid(-1, &stat, WNOHANG) > 0) { |
| 524 |
+ |
/* Subprocess exited; check status */ |
| 525 |
+ |
if (!WIFEXITED(stat) || WEXITSTATUS(stat)) |
| 526 |
+ |
error(USER, "failed photon distribution"); |
| 527 |
+ |
|
| 528 |
+ |
--proc; |
| 529 |
+ |
} |
| 530 |
+ |
|
| 531 |
+ |
/* Nod off for a bit and update progress */ |
| 532 |
+ |
sleep(1); |
| 533 |
+ |
|
| 534 |
+ |
/* Update progress report from shared subprocess counters */ |
| 535 |
+ |
repComplete = pm -> distribTarget * numProc; |
| 536 |
+ |
repProgress = photonCnt [PHOTONCNT_NUMPHOT]; |
| 537 |
+ |
for (repEmitted = 0, srcIdx = 0; srcIdx < nsources; srcIdx++) |
| 538 |
+ |
repEmitted += photonCnt [PHOTONCNT_NUMEMIT(srcIdx)]; |
| 539 |
+ |
|
| 540 |
+ |
/* Get global photon count from shmem updated by subprocs */ |
| 541 |
+ |
pm -> numPhotons = photonCnt [PHOTONCNT_NUMPHOT]; |
| 542 |
+ |
|
| 543 |
+ |
if (photonRepTime > 0 && time(NULL) >= repLastTime + photonRepTime) |
| 544 |
+ |
pmapDistribReport(); |
| 545 |
+ |
#ifdef SIGCONT |
| 546 |
+ |
else signal(SIGCONT, pmapDistribReport); |
| 547 |
+ |
#endif |
| 548 |
+ |
} |
| 549 |
+ |
|
| 550 |
|
/* ================================================================ |
| 551 |
|
* POST-DISTRIBUTION - Set photon flux and build kd-tree, etc. |
| 552 |
|
* ================================================================ */ |
| 553 |
< |
#ifdef SIGCONT |
| 554 |
< |
signal(SIGCONT, SIG_DFL); |
| 555 |
< |
#endif |
| 553 |
> |
#ifdef SIGCONT |
| 554 |
> |
signal(SIGCONT, SIG_DFL); |
| 555 |
> |
#endif |
| 556 |
|
free(emap.samples); |
| 557 |
|
|
| 558 |
< |
if (!pm -> heapEnd) |
| 558 |
> |
if (!pm -> numPhotons) |
| 559 |
|
error(USER, "empty photon map"); |
| 560 |
|
|
| 561 |
< |
/* Check for valid primary photon rays */ |
| 562 |
< |
if (!pm -> primary) |
| 561 |
> |
/* Load per-subprocess primary rays into pm -> primary array */ |
| 562 |
> |
pm -> numPrimary = buildPrimaries(pm, primaryHeap, primaryOfs, numProc); |
| 563 |
> |
if (!pm -> numPrimary) |
| 564 |
|
error(INTERNAL, "no primary rays in contribution photon map"); |
| 487 |
– |
|
| 488 |
– |
if (pm -> primary [pm -> primaryEnd].srcIdx < 0) |
| 489 |
– |
/* Last primary ray is unused, so decrement counter */ |
| 490 |
– |
pm -> primaryEnd--; |
| 565 |
|
|
| 566 |
+ |
/* Set photon flux per source */ |
| 567 |
+ |
for (srcIdx = 0; srcIdx < nsources; srcIdx++) |
| 568 |
+ |
srcFlux [srcIdx] /= photonCnt [PHOTONCNT_NUMEMIT(srcIdx)]; |
| 569 |
+ |
|
| 570 |
+ |
/* Photon counters no longer needed, unmap shared memory */ |
| 571 |
+ |
munmap(photonCnt, sizeof(*photonCnt)); |
| 572 |
+ |
close(shmFile); |
| 573 |
+ |
#if 0 |
| 574 |
+ |
shm_unlink(shmFname); |
| 575 |
+ |
#else |
| 576 |
+ |
unlink(shmFname); |
| 577 |
+ |
#endif |
| 578 |
+ |
|
| 579 |
|
if (photonRepTime) { |
| 580 |
< |
eputs("\nBuilding contrib photon heap...\n"); |
| 580 |
> |
eputs("\nBuilding contrib photon map...\n"); |
| 581 |
|
fflush(stderr); |
| 582 |
|
} |
| 583 |
< |
|
| 584 |
< |
balancePhotons(pm, srcFlux); |
| 583 |
> |
|
| 584 |
> |
/* Build underlying data structure; heap is destroyed */ |
| 585 |
> |
buildPhotonMap(pm, srcFlux, primaryOfs, numProc); |
| 586 |
|
} |
