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RadiancePmap/pmapdens.h
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pmapdens.h
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/* RCSid $Id$ */
/*
======================================================================
Photon map density estimation routines
Roland Schregle (roland.schregle@{hslu.ch, gmail.com})
(c) Fraunhofer Institute for Solar Energy Systems,
supported by the German Research Foundation
(DFG LU-204/10-2, "Fassadenintegrierte Regelsysteme" (FARESYS))
(c) Lucerne University of Applied Sciences and Arts,
supported by the Swiss National Science Foundation
(SNSF #147053, "Daylight Redirecting Components")
(c) Tokyo University of Science,
supported by the JSPS Grants-in-Aid for Scientific Research
(KAKENHI JP19KK0115, "Three-Dimensional Light Flow")
======================================================================
$Id$
*/
#ifndef PMAPDENS_H
#define PMAPDENS_H
#include "pmap.h"
/* Photon map lookup functions per type */
void (*pmapLookup [NUM_PMAP_TYPES])(PhotonMap*, RAY*, COLOR);
void photonDensity (PhotonMap *pmap, RAY *ray, COLOR irrad);
/* Surface-bound photon density estimate for global and caustic photons.
Returns irradiance at ray -> rop. */
void photonPreCompDensity (PhotonMap *pmap, RAY *r, COLOR irrad);
/* Surface-bound photon density estimate for (single) precomputed photon.
Returns precomputed irradiance at ray -> rop. */
void volumePhotonDensity (PhotonMap *pmap, RAY *ray, COLOR irrad);
/* Volume photon density estimate using Henyey-Greenstein phase function.
Returns inscattered irradiance at ray -> rop. */
#ifdef PMAP_PHOTONFLOW
/* Routines to evaluate the scalar irradiance of a physical light
field represented by "photon flow" using volume photons, ignoring
the participating medium in which they are deposited. */
void volumePhotonSphIrrad (PhotonMap *pmap, RAY *ray, COLOR irrad);
/* Evaluate mean spherical irradiance from volume photons inscattered
* at ray -> rop. */
void volumePhotonCubicIllum (PhotonMap *pmap, RAY *ray, COLOR irrad);
/* Evaluate cubic illuminance according to Cuttle from volume photons
* inscattered at ray -> rop. */
void lightFlowPhotonDensity (PhotonMap *pmap, RAY *ray, COLOR irrad);
/* Evaluate irradiance from volume photons at ray->rop for plane defined
* by normal ray -> ron, ignoring participating medium. The evaluation
* interprets the volume photon map as a representation of the "flow"
* of light, i.e. a physical light field. */
#endif
#endif
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