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RadiancePmap/pmapmat.h
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pmapmat.h
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/* RCSid $Id: pmapmat.h,v 2.13 2019/02/04 18:20:27 rschregle Exp $ */
/*
======================================================================
Photon map support routines for scattering by materials.
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)
======================================================================
*/
#ifndef PMAPMAT_H
#define PMAPMAT_H
#include "pmap.h"
/*
Check for paths already accounted for in photon map to avoid
double-counting during backward raytracing.
ambRayInPmap(): Check for DIFFUSE -> (DIFFUSE|SPECULAR) -> *
subpaths. These occur during the backward pass
when an ambient ray spawns an indirect diffuse or
specular ray. These subpaths are already
accounted for in the global photon map.
*/
#define ambRayInPmap(r) ((r) -> crtype & AMBIENT && photonMapping && \
(ambounce < 0 || (r) -> rlvl > 1))
/*
shadowRayInPmap(): Check for DIFFUSE -> SPECULAR -> LIGHT
subpaths. These occur during the backward pass
when a shadow ray is transferred through a
transparent material. These subpaths are already
accounted for by caustic photons in the global,
contrib, or dedicated caustic photon map.
!!! DISABLED FOR TESTING PENDING REPLACEMENT BY srcRayInPmap() !!!
*/
#if 1
#define shadowRayInPmap(r) 0
#else
#define shadowRayInPmap(r) (((globalPmap && ambounce < 0) || \
causticPmap || contribPmap) && \
(r) -> crtype & SHADOW)
#endif
/* srcRayInPmap(): Check whether a source ray transferred through
* medium (e.g. glass/dielectric) is already
* accounted for in the photon map. This is used by
* badcomponent() in source.c when checking source
* hits (glows and lights, hence ambient and shadow
* rays).
*/
#define srcRayInPmap(r) (((globalPmap && ambounce < 0) || \
causticPmap || contribPmap) && \
(r) -> crtype & (AMBIENT | SHADOW) && \
(r) -> rtype & (TRANS | REFRACTED))
/* Check if scattered ray spawns a caustic photon;
* !!! NOTE this returns a single bit as boolean value (0|1), rather
* !!! than the original short int, hence the explicit test against zero.
* !!! This allows the macro the be used in a conditional statement
* !!! and when setting a photon's caustic flag in newPhoton(). */
#define PMAP_CAUSTICRAY(r) (((r) -> rtype & SPECULAR) != 0)
/* Scattered photon ray types for photonRay() */
#define PMAP_DIFFREFL (REFLECTED | AMBIENT)
#define PMAP_DIFFTRANS (REFLECTED | AMBIENT | TRANS)
#define PMAP_SPECREFL (REFLECTED | SPECULAR)
#define PMAP_SPECTRANS (REFLECTED | SPECULAR | TRANS)
#define PMAP_REFRACT (REFRACTED | SPECULAR)
#define PMAP_XFER (TRANS)
/* Dispatch table for photon scattering functions */
extern int (*photonScatter []) (OBJREC*, RAY*);
/* List of antimatter sensor modifier names */
extern char *photonSensorList [MAXSET + 1];
/* Spawn a new photon ray from a previous one; this is effectively a
* customised rayorigin(). */
void photonRay (const RAY *rayIn, RAY *rayOut, int rayOutType,
COLOR fluxAtten);
/* Init photonScatter[] dispatch table with material specific scattering
routines */
void initPhotonScatterFuncs ();
/* Find antimatter geometry declared as photon sensors */
void getPhotonSensors (char **sensorList);
#endif
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