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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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Lucerne University of Applied Sciences & Arts |
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================================================================== |
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$Id: pmapmat.h,v 4.11 2015/01/29 13:09:17 taschreg Exp taschreg $ |
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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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Checks for paths already accounted for in photon map to avoid |
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double-counting during backward raytracing. |
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ambRayInPmap(): Check for DIFFUSE -> (DIFFUSE|SPECULAR) -> * |
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subpaths. These occur during the backward pass |
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when an ambient ray spawns an indirect diffuse or |
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specular ray. These subpaths are already |
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accounted for in the global photon map. |
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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 ambRayInPmap(r) ((r) -> crtype & AMBIENT && photonMapping) |
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#define shadowRayInPmap(r) ((r) -> crtype & SHADOW && \ |
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((photonMapping && ambounce < 0) || \ |
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(causticPhotonMapping || \ |
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contribPhotonMapping))) |
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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 |
