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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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Lucerne University of Applied Sciences & Arts |
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================================================================== |
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$Id: pmapamb.c,v 1.6 2014/12/01 16:39:56 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 only at primary rays */ |
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if (pmap && !rdepth) { |
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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 -> lookupFlags = PMAP_CAUST_BIT; |
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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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} |
