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/*
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==================================================================
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Photon map support routines for scattering by materials.
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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: pmapmat.h,v 2.4 2015/05/21 15:28:24 greg Exp $
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*/
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#ifndef PMAPMAT_H
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#define PMAPMAT_H
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#include "pmap.h"
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/*
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Check for paths already accounted for in photon map to avoid
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double-counting during backward raytracing.
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shadowRayInPmap(): Check for DIFFUSE -> SPECULAR -> LIGHT
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subpaths. These occur during the backward pass
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when a shadow ray is transferred through a
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transparent material. These subpaths are already
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accounted for by caustic photons in the global,
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contrib, or dedicated caustic photon map.
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*/
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#define shadowRayInPmap(r) ((r) -> crtype & SHADOW && \
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(ambounce < 0 || causticPhotonMapping))
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/* Check if scattered ray spawns a caustic photon */
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#define PMAP_CAUSTICRAY(r) ((r) -> rtype & SPECULAR)
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/* Scattered photon ray types for photonRay() */
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#define PMAP_DIFFREFL (REFLECTED | AMBIENT)
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#define PMAP_DIFFTRANS (REFLECTED | AMBIENT | TRANS)
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#define PMAP_SPECREFL (REFLECTED | SPECULAR)
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#define PMAP_SPECTRANS (REFLECTED | SPECULAR | TRANS)
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#define PMAP_REFRACT (REFRACTED | SPECULAR)
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#define PMAP_XFER (TRANS)
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/* Dispatch table for photon scattering functions */
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extern int (*photonScatter []) (OBJREC*, RAY*);
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/* List of antimatter sensor modifier names */
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extern char *photonSensorList [MAXSET + 1];
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/* Spawn a new photon ray from a previous one; this is effectively a
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* customised rayorigin(). */
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void photonRay (const RAY *rayIn, RAY *rayOut, int rayOutType,
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COLOR fluxAtten);
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/* Init photonScatter[] dispatch table with material specific scattering
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routines */
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void initPhotonScatterFuncs ();
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/* Find antimatter geometry declared as photon sensors */
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void getPhotonSensors (char **sensorList);
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#endif
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