1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: pmapamb.c,v 2.6 2015/08/18 18:45:55 greg Exp $"; |
3 |
#endif |
4 |
|
5 |
/* |
6 |
================================================================== |
7 |
Photon map interface to RADIANCE ambient calculation |
8 |
|
9 |
Roland Schregle (roland.schregle@{hslu.ch, gmail.com}) |
10 |
(c) Fraunhofer Institute for Solar Energy Systems, |
11 |
(c) Lucerne University of Applied Sciences and Arts, |
12 |
supported by the Swiss National Science Foundation (SNSF, #147053) |
13 |
================================================================== |
14 |
|
15 |
$Id: pmapamb.c,v 1.8 2015/08/10 14:10:16 taschreg Exp taschreg $ |
16 |
*/ |
17 |
|
18 |
|
19 |
#include "pmapamb.h" |
20 |
#include "pmap.h" |
21 |
|
22 |
|
23 |
int ambPmap (COLOR aval, RAY *r, int rdepth) |
24 |
/* Factor irradiance from photon map into ambient coefficient aval; |
25 |
* return 1 on success, else 0 (with aval unmodified) */ |
26 |
{ |
27 |
COLOR rcoef, photonIrrad; |
28 |
/* Handle precedence in case of multiple photon maps: |
29 |
* contrib > precomp > global */ |
30 |
PhotonMap *pmap = contribPhotonMapping ? contribPmap |
31 |
: preCompPmap ? preCompPmap |
32 |
: globalPmap; |
33 |
|
34 |
/* Get photon irradiance either via 1 ambient bounce (final |
35 |
* gather) if ambounce > 0, or directly if ambounce < 0. */ |
36 |
if (pmap && (rdepth || ambounce < 0)) { |
37 |
/* Temporarily factor ambient value into ray coefficient |
38 |
* (required for contribution photon map) */ |
39 |
copycolor(rcoef, r -> rcoef); |
40 |
multcolor(r -> rcoef, aval); |
41 |
|
42 |
/* Get photon irradiance via callback */ |
43 |
pmap -> lookupFlags = 0; |
44 |
(pmap -> lookup)(pmap, r, photonIrrad); |
45 |
|
46 |
/* Factor irradiance into ambient value and restore ray coeficient */ |
47 |
multcolor(aval, photonIrrad); |
48 |
copycolor(r -> rcoef, rcoef); |
49 |
|
50 |
return 1; |
51 |
} |
52 |
|
53 |
return 0; |
54 |
} |
55 |
|
56 |
|
57 |
int ambPmapCaustic (COLOR aval, RAY *r, int rdepth) |
58 |
/* Factor specular-diffuse (caustic) irradiance from photon map into ambient |
59 |
* coeff aval; return 1 if successful, else 0 (with aval set to zero) */ |
60 |
{ |
61 |
COLOR rcoef, photonIrrad; |
62 |
/* Handle precedence in case of multiple photon maps: contrib > caustic */ |
63 |
PhotonMap *pmap = contribPhotonMapping ? contribPmap : causticPmap; |
64 |
|
65 |
/* Get caustic photon density estimate at primary rays or when |
66 |
* filling in ambient rays that have no global photon map to use */ |
67 |
if (pmap && (!rdepth || !globalPmap & !contribPmap & !preCompPmap)) { |
68 |
/* Temporarily factor ambient value into ray coefficient |
69 |
* (required for contribution photon map) */ |
70 |
copycolor(rcoef, r -> rcoef); |
71 |
multcolor(r -> rcoef, aval); |
72 |
|
73 |
/* Set caustic flag and get photon irradiance via callback */ |
74 |
pmap -> lookupCaustic = 1; |
75 |
(pmap -> lookup)(pmap, r, photonIrrad); |
76 |
|
77 |
/* Factor irradiance into ambient value and restore ray coeficient */ |
78 |
multcolor(aval, photonIrrad); |
79 |
copycolor(r -> rcoef, rcoef); |
80 |
|
81 |
return 1; |
82 |
} |
83 |
|
84 |
setcolor(aval, 0, 0, 0); |
85 |
|
86 |
return 0; |
87 |
} |