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greg |
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/* |
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================================================================== |
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Photon map support for light source contributions |
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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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Lucerne University of Applied Sciences & Arts |
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================================================================== |
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$Id: pmapcontrib.c,v 4.27 2015/02/12 09:57:21 taschreg Exp taschreg $ |
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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 "pmapio.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 <signal.h> |
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extern int contrib; /* coeff/contrib flag */ |
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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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{ |
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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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} |
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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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/* 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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srcMod = objptr(source [primary -> srcIdx].so -> omod); |
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if ((MODCONT*)lu_find(srcContrib, srcMod -> oname) -> data) |
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++found; |
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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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} |
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void initPmapContrib (LUTAB *srcContrib, unsigned numSrcContrib) |
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{ |
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unsigned t; |
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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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/* Get params */ |
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setPmapContribParams(contribPmap, srcContrib); |
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if (contribPhotonMapping) { |
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if (contribPmap -> maxGather < numSrcContrib) { |
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/* Adjust density estimate bandwidth if lower than modifier |
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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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} |
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/* Sanity check */ |
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checkPmapContribs(contribPmap, srcContrib); |
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} |
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} |
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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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{ |
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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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FVECT rdir, rop; |
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setcolor(irrad, 0, 0, 0); |
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if (!pmap -> maxGather) |
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return; |
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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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/* Set context for binning function evaluation and get cumulative path |
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* coefficient up to photon lookup point */ |
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worldfunc(RCCONTEXT, ray); |
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raycontrib(rayCoeff, ray, PRIMARY); |
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/* Save incident ray's direction and hitpoint */ |
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VCOPY(rdir, ray -> rdir); |
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VCOPY(rop, ray -> rop); |
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/* Lookup photons */ |
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pmap -> squeueEnd = 0; |
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findPhotons(pmap, ray); |
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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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return; |
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} |
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/* Average (squared) radius between furthest two photons to improve |
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* accuracy and get inverse search area 1 / (PI * r^2), with extra |
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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); |
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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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/* Skip the extra photon */ |
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for (i = 1 ; i < pmap -> squeueEnd; i++, sq++) { |
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COLOR flux; |
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/* Get photon's contribution to density estimate */ |
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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) */ |
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scalecolor(flux, 2 * (1 - sq -> dist / r)); |
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#endif |
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addcolor(irrad, flux); |
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if (pmap -> srcContrib) { |
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const PhotonPrimary *primary = pmap -> primary + |
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sq -> photon -> primary; |
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OBJREC *srcMod = objptr(source [primary -> srcIdx].so -> omod); |
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MODCONT *srcContrib = (MODCONT*)lu_find(pmap -> srcContrib, |
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srcMod -> oname) -> data; |
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if (srcContrib) { |
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/* Photon's emitting light source has modifier whose |
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* contributions are sought */ |
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int srcBin; |
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/* Set incident dir and origin of photon's primary ray on |
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* light source for dummy shadow ray, and evaluate binning |
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* function */ |
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VCOPY(ray -> rdir, primary -> dir); |
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VCOPY(ray -> rop, primary -> org); |
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srcBin = evalue(srcContrib -> binv) + .5; |
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if (srcBin < 0 || srcBin >= srcContrib -> nbins) { |
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error(WARNING, "bad bin number (ignored)"); |
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continue; |
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} |
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if (!contrib) { |
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/* Ray coefficient mode; normalise by light source radiance |
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* after applying distrib pattern */ |
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int j; |
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raytexture(ray, srcMod -> omod); |
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setcolor(ray -> rcol, srcMod -> oargs.farg [0], |
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srcMod -> oargs.farg [1], srcMod -> oargs.farg [2]); |
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multcolor(ray -> rcol, ray -> pcol); |
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for (j = 0; j < 3; j++) |
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flux [j] = ray -> rcol [j] ? flux [j] / ray -> rcol [j] |
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: 0; |
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} |
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multcolor(flux, rayCoeff); |
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addcolor(srcContrib -> cbin [srcBin], flux); |
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} |
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else fprintf(stderr, "Skipped contrib from %s\n", srcMod -> oname); |
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} |
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} |
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/* Restore incident ray's direction and hitpoint */ |
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VCOPY(ray -> rdir, rdir); |
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VCOPY(ray -> rop, rop); |
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return; |
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} |
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void distribPhotonContrib (PhotonMap* pm) |
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{ |
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EmissionMap emap; |
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char errmsg2 [128]; |
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unsigned srcIdx; |
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double *srcFlux; /* Emitted flux per light source */ |
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const double srcDistribTarget = /* Target photon count per source */ |
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nsources ? (double)pm -> distribTarget / nsources : 0; |
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if (!pm) |
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error(USER, "no photon map defined"); |
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if (!nsources) |
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error(USER, "no light sources"); |
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/* Allocate photon flux per light source; this differs for every |
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* source as all sources contribute the same number of distributed |
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* photons (srcDistribTarget), hence the number of photons emitted per |
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* source does not correlate with its emitted flux. The resulting flux |
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* per photon is therefore adjusted individually for each source. */ |
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if (!(srcFlux = calloc(nsources, sizeof(double)))) |
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error(SYSTEM, "cannot allocate source flux"); |
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/* ================================================================ |
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* INITIALISASHUNN - Set up emisshunn and scattering funcs |
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* ================================================================ */ |
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emap.samples = NULL; |
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emap.src = NULL; |
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emap.maxPartitions = MAXSPART; |
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emap.partitions = (unsigned char*)malloc(emap.maxPartitions >> 1); |
| 248 |
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if (!emap.partitions) |
| 249 |
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error(USER, "can't allocate source partitions"); |
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initPhotonMap(pm, PMAP_TYPE_CONTRIB); |
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initPhotonEmissionFuncs(); |
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initPhotonScatterFuncs(); |
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/* Get photon ports if specified */ |
| 256 |
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if (ambincl == 1) |
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getPhotonPorts(); |
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/* Get photon sensor modifiers */ |
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getPhotonSensors(photonSensorList); |
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/* Seed RNGs for photon distribution */ |
| 263 |
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pmapSeed(randSeed, partState); |
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pmapSeed(randSeed, emitState); |
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pmapSeed(randSeed, cntState); |
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pmapSeed(randSeed, mediumState); |
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pmapSeed(randSeed, scatterState); |
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pmapSeed(randSeed, rouletteState); |
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| 270 |
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/* Record start time and enable progress report signal handler */ |
| 271 |
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repStartTime = time(NULL); |
| 272 |
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signal(SIGCONT, pmapDistribReport); |
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| 274 |
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for (srcIdx = 0; srcIdx < nsources; srcIdx++) { |
| 275 |
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unsigned portCnt = 0, passCnt = 0, prePassCnt = 0; |
| 276 |
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double srcNumEmit = 0; /* # photons to emit from source */ |
| 277 |
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unsigned long srcNumDistrib = pm -> heapEnd; /* # photons stored */ |
| 278 |
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| 279 |
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srcFlux [srcIdx] = repProgress = 0; |
| 280 |
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emap.src = source + srcIdx; |
| 281 |
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| 282 |
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if (photonRepTime) |
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eputs("\n"); |
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| 285 |
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/* ============================================================= |
| 286 |
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* FLUX INTEGRATION - Get total flux emitted from light source |
| 287 |
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* ============================================================= */ |
| 288 |
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do { |
| 289 |
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emap.port = emap.src -> sflags & SDISTANT |
| 290 |
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? photonPorts + portCnt : NULL; |
| 291 |
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photonPartition [emap.src -> so -> otype] (&emap); |
| 292 |
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| 293 |
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if (photonRepTime) { |
| 294 |
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sprintf(errmsg, "Integrating flux from source %s (mod %s) ", |
| 295 |
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source [srcIdx].so -> oname, |
| 296 |
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objptr(source [srcIdx].so -> omod) -> oname); |
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| 298 |
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if (emap.port) { |
| 299 |
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sprintf(errmsg2, "via port %s ", |
| 300 |
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photonPorts [portCnt].so -> oname); |
| 301 |
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strcat(errmsg, errmsg2); |
| 302 |
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} |
| 303 |
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| 304 |
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sprintf(errmsg2, "(%lu partitions)...\n", |
| 305 |
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emap.numPartitions); |
| 306 |
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strcat(errmsg, errmsg2); |
| 307 |
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eputs(errmsg); |
| 308 |
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fflush(stderr); |
| 309 |
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} |
| 310 |
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| 311 |
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for (emap.partitionCnt = 0; |
| 312 |
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emap.partitionCnt < emap.numPartitions; |
| 313 |
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emap.partitionCnt++) { |
| 314 |
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initPhotonEmission(&emap, pdfSamples); |
| 315 |
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srcFlux [srcIdx] += colorAvg(emap.partFlux); |
| 316 |
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} |
| 317 |
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| 318 |
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portCnt++; |
| 319 |
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} while (portCnt < numPhotonPorts); |
| 320 |
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| 321 |
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if (srcFlux [srcIdx] < FTINY) { |
| 322 |
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sprintf(errmsg, "source %s has zero emission", |
| 323 |
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source [srcIdx].so -> oname); |
| 324 |
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error(WARNING, errmsg); |
| 325 |
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} |
| 326 |
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else { |
| 327 |
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/* ========================================================== |
| 328 |
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* 2-PASS PHOTON DISTRIBUTION |
| 329 |
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* Pass 1 (pre): emit fraction of target photon count |
| 330 |
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* Pass 2 (main): based on outcome of pass 1, estimate |
| 331 |
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* remaining number of photons to emit to |
| 332 |
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* approximate target count |
| 333 |
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* ========================================================== */ |
| 334 |
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do { |
| 335 |
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if (!passCnt) { |
| 336 |
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/* INIT PASS 1 */ |
| 337 |
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if (++prePassCnt > maxPreDistrib) { |
| 338 |
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/* Warn if no photons contributed after sufficient |
| 339 |
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* iterations */ |
| 340 |
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sprintf(errmsg, "too many prepasses, no photons " |
| 341 |
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"from source %s", source [srcIdx].so -> oname); |
| 342 |
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error(WARNING, errmsg); |
| 343 |
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break; |
| 344 |
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} |
| 345 |
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| 346 |
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/* Num to emit is fraction of target count */ |
| 347 |
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srcNumEmit = preDistrib * srcDistribTarget; |
| 348 |
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} |
| 349 |
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| 350 |
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else { |
| 351 |
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/* INIT PASS 2 */ |
| 352 |
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/* Based on the outcome of the predistribution we can now |
| 353 |
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* figure out how many more photons we have to emit from |
| 354 |
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* the current source to meet the target count, |
| 355 |
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* srcDistribTarget. This value is clamped to 0 in case |
| 356 |
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* the target has already been exceeded in pass 1. |
| 357 |
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* srcNumEmit and srcNumDistrib is the number of photons |
| 358 |
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* emitted and distributed (stored) from the current |
| 359 |
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* source in pass 1, respectively. */ |
| 360 |
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srcNumDistrib = pm -> heapEnd - srcNumDistrib; |
| 361 |
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srcNumEmit *= srcNumDistrib |
| 362 |
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? max(srcDistribTarget/srcNumDistrib, 1) - 1 |
| 363 |
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: 0; |
| 364 |
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| 365 |
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if (!srcNumEmit) |
| 366 |
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/* No photons left to distribute in main pass */ |
| 367 |
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break; |
| 368 |
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} |
| 369 |
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| 370 |
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/* Set completion count for progress report */ |
| 371 |
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repComplete = srcNumEmit + repProgress; |
| 372 |
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portCnt = 0; |
| 373 |
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|
| 374 |
|
|
do { |
| 375 |
|
|
emap.port = emap.src -> sflags & SDISTANT |
| 376 |
|
|
? photonPorts + portCnt : NULL; |
| 377 |
|
|
photonPartition [emap.src -> so -> otype] (&emap); |
| 378 |
|
|
|
| 379 |
|
|
if (photonRepTime) { |
| 380 |
|
|
if (!passCnt) |
| 381 |
|
|
sprintf(errmsg, "PREPASS %d on source %s (mod %s) ", |
| 382 |
|
|
prePassCnt, source [srcIdx].so -> oname, |
| 383 |
|
|
objptr(source[srcIdx].so->omod) -> oname); |
| 384 |
|
|
else |
| 385 |
|
|
sprintf(errmsg, "MAIN PASS on source %s (mod %s) ", |
| 386 |
|
|
source [srcIdx].so -> oname, |
| 387 |
|
|
objptr(source[srcIdx].so->omod) -> oname); |
| 388 |
|
|
|
| 389 |
|
|
if (emap.port) { |
| 390 |
|
|
sprintf(errmsg2, "via port %s ", |
| 391 |
|
|
photonPorts [portCnt].so -> oname); |
| 392 |
|
|
strcat(errmsg, errmsg2); |
| 393 |
|
|
} |
| 394 |
|
|
|
| 395 |
|
|
sprintf(errmsg2, "(%lu partitions)...\n", |
| 396 |
|
|
emap.numPartitions); |
| 397 |
|
|
strcat(errmsg, errmsg2); |
| 398 |
|
|
eputs(errmsg); |
| 399 |
|
|
fflush(stderr); |
| 400 |
|
|
} |
| 401 |
|
|
|
| 402 |
|
|
for (emap.partitionCnt = 0; |
| 403 |
|
|
emap.partitionCnt < emap.numPartitions; |
| 404 |
|
|
emap.partitionCnt++) { |
| 405 |
|
|
double partNumEmit; |
| 406 |
|
|
unsigned long partEmitCnt; |
| 407 |
|
|
|
| 408 |
|
|
/* Get photon origin within current source partishunn |
| 409 |
|
|
* and build emission map */ |
| 410 |
|
|
photonOrigin [emap.src -> so -> otype] (&emap); |
| 411 |
|
|
initPhotonEmission(&emap, pdfSamples); |
| 412 |
|
|
|
| 413 |
|
|
/* Number of photons to emit from ziss partishunn; |
| 414 |
|
|
* scale according to its normalised contribushunn to |
| 415 |
|
|
* the emitted source flux */ |
| 416 |
|
|
partNumEmit = srcNumEmit * colorAvg(emap.partFlux) / |
| 417 |
|
|
srcFlux [srcIdx]; |
| 418 |
|
|
partEmitCnt = (unsigned long)partNumEmit; |
| 419 |
|
|
|
| 420 |
|
|
/* Probabilistically account for fractional photons */ |
| 421 |
|
|
if (pmapRandom(cntState) < partNumEmit - partEmitCnt) |
| 422 |
|
|
partEmitCnt++; |
| 423 |
|
|
|
| 424 |
|
|
/* Integer counter avoids FP rounding errors */ |
| 425 |
|
|
while (partEmitCnt--) { |
| 426 |
|
|
RAY photonRay; |
| 427 |
|
|
|
| 428 |
|
|
/* Emit photon according to PDF (if any), allocate |
| 429 |
|
|
* associated primary ray, and trace through scene |
| 430 |
|
|
* until absorbed/leaked */ |
| 431 |
|
|
emitPhoton(&emap, &photonRay); |
| 432 |
|
|
addPhotonPrimary(pm, &photonRay); |
| 433 |
|
|
tracePhoton(&photonRay); |
| 434 |
|
|
|
| 435 |
|
|
/* Record progress */ |
| 436 |
|
|
repProgress++; |
| 437 |
|
|
|
| 438 |
|
|
if (photonRepTime > 0 && |
| 439 |
|
|
time(NULL) >= repLastTime + photonRepTime) |
| 440 |
|
|
pmapDistribReport(); |
| 441 |
|
|
#ifndef BSD |
| 442 |
|
|
else signal(SIGCONT, pmapDistribReport); |
| 443 |
|
|
#endif |
| 444 |
|
|
} |
| 445 |
|
|
} |
| 446 |
|
|
|
| 447 |
|
|
portCnt++; |
| 448 |
|
|
} while (portCnt < numPhotonPorts); |
| 449 |
|
|
|
| 450 |
|
|
if (pm -> heapEnd == srcNumDistrib) |
| 451 |
|
|
/* Double preDistrib in case no photons were stored |
| 452 |
|
|
* for this source and redo pass 1 */ |
| 453 |
|
|
preDistrib *= 2; |
| 454 |
|
|
else { |
| 455 |
|
|
/* Now do pass 2 */ |
| 456 |
|
|
passCnt++; |
| 457 |
|
|
if (photonRepTime) |
| 458 |
|
|
eputs("\n"); |
| 459 |
|
|
} |
| 460 |
|
|
} while (passCnt < 2); |
| 461 |
|
|
|
| 462 |
|
|
/* Flux per photon emitted from this source; repProgress is the |
| 463 |
|
|
* number of emitted photons after both passes */ |
| 464 |
|
|
srcFlux [srcIdx] = repProgress ? srcFlux [srcIdx] / repProgress |
| 465 |
|
|
: 0; |
| 466 |
|
|
} |
| 467 |
|
|
} |
| 468 |
|
|
|
| 469 |
|
|
/* ================================================================ |
| 470 |
|
|
* POST-DISTRIBUTION - Set photon flux and build kd-tree, etc. |
| 471 |
|
|
* ================================================================ */ |
| 472 |
|
|
signal(SIGCONT, SIG_DFL); |
| 473 |
|
|
free(emap.samples); |
| 474 |
|
|
|
| 475 |
|
|
if (!pm -> heapEnd) |
| 476 |
|
|
error(USER, "empty photon map"); |
| 477 |
|
|
|
| 478 |
|
|
/* Check for valid primary photon rays */ |
| 479 |
|
|
if (!pm -> primary) |
| 480 |
|
|
error(INTERNAL, "no primary rays in contribution photon map"); |
| 481 |
|
|
|
| 482 |
|
|
if (pm -> primary [pm -> primaryEnd].srcIdx < 0) |
| 483 |
|
|
/* Last primary ray is unused, so decrement counter */ |
| 484 |
|
|
pm -> primaryEnd--; |
| 485 |
|
|
|
| 486 |
|
|
if (photonRepTime) { |
| 487 |
|
|
eputs("\nBuilding contrib photon heap...\n"); |
| 488 |
|
|
fflush(stderr); |
| 489 |
|
|
} |
| 490 |
|
|
|
| 491 |
|
|
balancePhotons(pm, srcFlux); |
| 492 |
|
|
} |
