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