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#ifndef lint
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static const char RCSid[] = "$Id: pmcontrib2.c,v 2.5 2018/11/08 00:54:07 greg Exp $";
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#endif
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/*
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======================================================================
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Photon map support for using light source contributions
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Roland Schregle (roland.schregle@{hslu.ch, gmail.com})
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(c) Lucerne University of Applied Sciences and Arts,
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supported by the Swiss National Science Foundation (SNSF, #147053)
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======================================================================
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$Id: pmcontrib2.c,v 2.5 2018/11/08 00:54:07 greg Exp $
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*/
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#include "pmapcontrib.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 "otspecial.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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{
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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 -> primaries;
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PhotonPrimaryIdx i, found = 0;
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OBJREC *srcMod;
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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 -> numPrimary; 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 = 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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}
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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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#if 0
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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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#else
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/* Warn if density estimate bandwidth is lower than modifier
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* count, since some contributions will be missing */
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error(WARNING, "photon density estimate bandwidth too low,"
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" contributions may be underestimated");
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#endif
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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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PhotonSearchQueueNode *sqn;
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float r2, invArea;
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SCOLOR rayCoeff;
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Photon *photon;
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static char warnPos = 1, warnDir = 1;
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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 && islight(objptr(ray -> ro -> omod) -> otype))
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return;
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/* Get cumulative path coefficient up to photon lookup point */
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raycontrib(rayCoeff, ray, PRIMARY);
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/* Lookup photons */
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pmap -> squeue.tail = 0;
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findPhotons(pmap, ray);
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/* Need at least 2 photons */
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if (pmap -> squeue.tail < 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 radius^2 between furthest two photons to improve accuracy and
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* get inverse search area 1 / (PI * r^2), with extra normalisation
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* factor 1 / PI for ambient calculation */
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sqn = pmap -> squeue.node + 1;
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r2 = max(sqn -> dist2, (sqn + 1) -> dist2);
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r2 = 0.25 * (pmap -> maxDist2 + r2 + 2 * sqrt(pmap -> maxDist2 * r2));
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invArea = 1 / (PI * PI * r2);
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/* Skip the extra photon */
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for (i = 1 ; i < pmap -> squeue.tail; i++, sqn++) {
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COLOR flux;
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/* Get photon's contribution to density estimate */
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photon = getNearestPhoton(&pmap -> squeue, sqn -> idx);
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getPhotonFlux(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 based on photon distance */
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scalecolor(flux, 2 * (1 - sqn -> dist2 / r2));
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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 -> primaries +
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photon -> primary;
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const SRCREC *sp = &source [primary -> srcIdx];
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OBJREC *srcMod = findmaterial(sp -> so);
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MODCONT *srcContrib = (MODCONT*)lu_find(pmap -> srcContrib,
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srcMod -> oname) -> data;
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double srcBinReal;
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int srcBin;
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RAY srcRay;
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if (!srcContrib)
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continue;
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/* Photon's emitting light source has modifier whose contributions
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* are sought */
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if (srcContrib -> binv -> type != NUM) {
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/* Use intersection function to set shadow ray parameters if
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* it's not simply a constant */
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rayorigin(&srcRay, SHADOW, NULL, NULL);
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srcRay.rsrc = primary -> srcIdx;
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#ifdef PMAP_PRIMARYPOS
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VCOPY(srcRay.rorg, primary -> pos);
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#else
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/* No primary hitpoints; set dummy ray origin and warn once */
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srcRay.rorg [0] = srcRay.rorg [1] = srcRay.rorg [2] = 0;
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if (warnPos) {
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error(WARNING,
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"no photon primary hitpoints for bin evaluation; "
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"using dummy (0,0,0)! Recompile with -DPMAP_CBDM.");
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warnPos = 0;
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}
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#endif
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#ifdef PMAP_PRIMARYDIR
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decodedir(srcRay.rdir, primary -> dir);
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#else
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/* No primary incident direction; set dummy and warn once */
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if (warnDir) {
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error(WARNING,
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"no photon primary directions for bin evaluation; "
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"using dummy (0,0,0)! Recompile with -DPMAP_CBDM.");
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warnDir = 0;
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}
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srcRay.rdir [0] = srcRay.rdir [1] = srcRay.rdir [2] = 0;
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#endif
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if (!(sp->sflags & SDISTANT
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? sourcehit(&srcRay)
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: (*ofun[sp -> so -> otype].funp)(sp -> so, &srcRay)))
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continue; /* XXX shouldn't happen! */
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worldfunc(RCCONTEXT, &srcRay);
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set_eparams((char *)srcContrib -> params);
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}
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if ((srcBinReal = evalue(srcContrib -> binv)) < -.5)
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continue; /* silently ignore negative bins */
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if ((srcBin = srcBinReal + .5) >= 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] : 0;
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}
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multscolor(flux, rayCoeff);
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saddcolor(mcbin(srcContrib,srcBin), flux);
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}
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}
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return;
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}
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