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pmapamb.c
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Sat, Apr 20, 06:07

pmapamb.c
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#ifndef lint
static const char RCSid[] = "$Id: pmapamb.c,v 2.8 2016/05/17 17:39:47 rschregle Exp $";
#endif
/*
==================================================================
Photon map interface to RADIANCE ambient calculation
Roland Schregle (roland.schregle@{hslu.ch, gmail.com})
(c) Fraunhofer Institute for Solar Energy Systems,
(c) Lucerne University of Applied Sciences and Arts,
supported by the Swiss National Science Foundation (SNSF, #147053)
==================================================================
$Id: pmapamb.c,v 2.8 2016/05/17 17:39:47 rschregle Exp $
*/
#include "pmapamb.h"
#include "pmap.h"
int ambPmap (COLOR aval, RAY *r, int rdepth)
/* Factor irradiance from photon map into ambient coefficient aval;
* return 1 on success, else 0 (with aval unmodified) */
{
COLOR rcoef, photonIrrad;
/* Handle precedence in case of multiple photon maps:
* contrib > precomp > global */
PhotonMap *pmap = contribPhotonMapping ? contribPmap
: preCompPmap ? preCompPmap
: globalPmap;
/* Get photon irradiance either via 1 ambient bounce (final
* gather) if ambounce > 0, or directly if ambounce < 0. */
if (pmap && (rdepth || ambounce < 0)) {
/* Temporarily factor ambient value into ray coefficient
* (required for contribution photon map) */
copycolor(rcoef, r -> rcoef);
multcolor(r -> rcoef, aval);
/* Get photon irradiance via callback */
pmap -> lookupFlags = 0;
(pmap -> lookup)(pmap, r, photonIrrad);
/* Factor irradiance into ambient value and restore ray coeficient */
multcolor(aval, photonIrrad);
copycolor(r -> rcoef, rcoef);
return 1;
}
return 0;
}
int ambPmapCaustic (COLOR aval, RAY *r, int rdepth)
/* Factor specular-diffuse (caustic) irradiance from photon map into ambient
* coeff aval; return 1 if successful, else 0 (with aval set to zero) */
{
COLOR rcoef, photonIrrad;
/* Handle precedence in case of multiple photon maps: contrib > caustic */
PhotonMap *pmap = contribPhotonMapping ? contribPmap : causticPmap;
/* Get caustic photon density estimate at primary rays or when
* filling in ambient rays that have no global photon map to use */
if (pmap && (!rdepth || !globalPmap & !contribPmap & !preCompPmap)) {
/* Temporarily factor ambient value into ray coefficient
* (required for contribution photon map) */
copycolor(rcoef, r -> rcoef);
multcolor(r -> rcoef, aval);
/* Set caustic flag and get photon irradiance via callback */
pmap -> lookupCaustic = 1;
(pmap -> lookup)(pmap, r, photonIrrad);
/* Factor irradiance into ambient value and restore ray coeficient */
multcolor(aval, photonIrrad);
copycolor(r -> rcoef, rcoef);
return 1;
}
setcolor(aval, 0, 0, 0);
return 0;
}

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