| 1 |
/* |
| 2 |
================================================================== |
| 3 |
Photon map interface to RADIANCE ambient calculation |
| 4 |
|
| 5 |
Roland Schregle (roland.schregle@{hslu.ch, gmail.com}) |
| 6 |
(c) Fraunhofer Institute for Solar Energy Systems, |
| 7 |
(c) Lucerne University of Applied Sciences and Arts, |
| 8 |
supported by the Swiss National Science Foundation (SNSF, #147053) |
| 9 |
================================================================== |
| 10 |
|
| 11 |
$Id: pmapamb.c,v 2.1 2015/02/24 19:39:26 greg Exp $ |
| 12 |
*/ |
| 13 |
|
| 14 |
|
| 15 |
#include "pmapamb.h" |
| 16 |
#include "pmap.h" |
| 17 |
|
| 18 |
|
| 19 |
int ambPmap (COLOR aval, RAY *r, int rdepth) |
| 20 |
/* Factor irradiance from photon map into ambient coefficient aval; |
| 21 |
* return 1 on success, else 0 (with aval unmodified) */ |
| 22 |
{ |
| 23 |
COLOR rcoef, photonIrrad; |
| 24 |
/* Handle precedence in case of multiple photon maps: |
| 25 |
* contrib > precomp > global */ |
| 26 |
PhotonMap *pmap = contribPhotonMapping ? contribPmap |
| 27 |
: preCompPmap ? preCompPmap |
| 28 |
: globalPmap; |
| 29 |
|
| 30 |
/* Get photon irradiance either via 1 ambient bounce (final |
| 31 |
* gather) if ambounce > 0, or directly if ambounce < 0. */ |
| 32 |
if (pmap && (rdepth || ambounce < 0)) { |
| 33 |
/* Temporarily factor ambient value into ray coefficient |
| 34 |
* (required for contribution photon map) */ |
| 35 |
copycolor(rcoef, r -> rcoef); |
| 36 |
multcolor(r -> rcoef, aval); |
| 37 |
|
| 38 |
/* Get photon irradiance via callback */ |
| 39 |
pmap -> lookupFlags = 0; |
| 40 |
(pmap -> lookup)(pmap, r, photonIrrad); |
| 41 |
|
| 42 |
/* Factor irradiance into ambient value and restore ray coeficient */ |
| 43 |
multcolor(aval, photonIrrad); |
| 44 |
copycolor(r -> rcoef, rcoef); |
| 45 |
|
| 46 |
return 1; |
| 47 |
} |
| 48 |
|
| 49 |
return 0; |
| 50 |
} |
| 51 |
|
| 52 |
|
| 53 |
int ambPmapCaustic (COLOR aval, RAY *r, int rdepth) |
| 54 |
/* Factor specular-diffuse (caustic) irradiance from photon map into ambient |
| 55 |
* coeff aval; return 1 if successful, else 0 (with aval set to zero) */ |
| 56 |
{ |
| 57 |
COLOR rcoef, photonIrrad; |
| 58 |
/* Handle precedence in case of multiple photon maps: contrib > caustic */ |
| 59 |
PhotonMap *pmap = contribPhotonMapping ? contribPmap : causticPmap; |
| 60 |
|
| 61 |
/* Get caustic photon density estimate only at primary rays */ |
| 62 |
if (pmap && !rdepth) { |
| 63 |
/* Temporarily factor ambient value into ray coefficient |
| 64 |
* (required for contribution photon map) */ |
| 65 |
copycolor(rcoef, r -> rcoef); |
| 66 |
multcolor(r -> rcoef, aval); |
| 67 |
|
| 68 |
/* Set caustic flag and get photon irradiance via callback */ |
| 69 |
pmap -> lookupFlags = PMAP_CAUST_BIT; |
| 70 |
(pmap -> lookup)(pmap, r, photonIrrad); |
| 71 |
|
| 72 |
/* Factor irradiance into ambient value and restore ray coeficient */ |
| 73 |
multcolor(aval, photonIrrad); |
| 74 |
copycolor(r -> rcoef, rcoef); |
| 75 |
|
| 76 |
return 1; |
| 77 |
} |
| 78 |
|
| 79 |
setcolor(aval, 0, 0, 0); |
| 80 |
|
| 81 |
return 0; |
| 82 |
} |
