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#ifndef lint
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static const char RCSid[] = "$Id: pmapamb.c,v 2.6 2015/08/18 18:45:55 greg Exp $";
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#endif
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/*
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==================================================================
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Photon map interface to RADIANCE ambient calculation
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Roland Schregle (roland.schregle@{hslu.ch, gmail.com})
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(c) Fraunhofer Institute for Solar Energy Systems,
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(c) Lucerne University of Applied Sciences and Arts,
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supported by the Swiss National Science Foundation (SNSF, #147053)
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==================================================================
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$Id: pmapamb.c,v 1.8 2015/08/10 14:10:16 taschreg Exp taschreg $
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*/
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#include "pmapamb.h"
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#include "pmap.h"
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int ambPmap (COLOR aval, RAY *r, int rdepth)
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/* Factor irradiance from photon map into ambient coefficient aval;
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* return 1 on success, else 0 (with aval unmodified) */
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{
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COLOR rcoef, photonIrrad;
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/* Handle precedence in case of multiple photon maps:
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* contrib > precomp > global */
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PhotonMap *pmap = contribPhotonMapping ? contribPmap
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: preCompPmap ? preCompPmap
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: globalPmap;
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/* Get photon irradiance either via 1 ambient bounce (final
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* gather) if ambounce > 0, or directly if ambounce < 0. */
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if (pmap && (rdepth || ambounce < 0)) {
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/* Temporarily factor ambient value into ray coefficient
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* (required for contribution photon map) */
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copycolor(rcoef, r -> rcoef);
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multcolor(r -> rcoef, aval);
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/* Get photon irradiance via callback */
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pmap -> lookupFlags = 0;
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(pmap -> lookup)(pmap, r, photonIrrad);
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/* Factor irradiance into ambient value and restore ray coeficient */
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multcolor(aval, photonIrrad);
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copycolor(r -> rcoef, rcoef);
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return 1;
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}
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return 0;
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}
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int ambPmapCaustic (COLOR aval, RAY *r, int rdepth)
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/* Factor specular-diffuse (caustic) irradiance from photon map into ambient
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* coeff aval; return 1 if successful, else 0 (with aval set to zero) */
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{
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COLOR rcoef, photonIrrad;
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/* Handle precedence in case of multiple photon maps: contrib > caustic */
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PhotonMap *pmap = contribPhotonMapping ? contribPmap : causticPmap;
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/* Get caustic photon density estimate at primary rays or when
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* filling in ambient rays that have no global photon map to use */
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if (pmap && (!rdepth || !globalPmap & !contribPmap & !preCompPmap)) {
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/* Temporarily factor ambient value into ray coefficient
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* (required for contribution photon map) */
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copycolor(rcoef, r -> rcoef);
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multcolor(r -> rcoef, aval);
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/* Set caustic flag and get photon irradiance via callback */
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pmap -> lookupCaustic = 1;
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(pmap -> lookup)(pmap, r, photonIrrad);
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/* Factor irradiance into ambient value and restore ray coeficient */
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multcolor(aval, photonIrrad);
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copycolor(r -> rcoef, rcoef);
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return 1;
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}
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setcolor(aval, 0, 0, 0);
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return 0;
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}
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