1 |
greg |
2.1 |
#ifndef lint |
2 |
greg |
2.4 |
static const char RCSid[] = "$Id: m_bsdf.c,v 2.3 2011/02/19 01:48:59 greg Exp $"; |
3 |
greg |
2.1 |
#endif |
4 |
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/* |
5 |
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* Shading for materials with BSDFs taken from XML data files |
6 |
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*/ |
7 |
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8 |
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#include "copyright.h" |
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10 |
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#include "ray.h" |
11 |
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#include "ambient.h" |
12 |
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#include "source.h" |
13 |
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#include "func.h" |
14 |
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#include "bsdf.h" |
15 |
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#include "random.h" |
16 |
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17 |
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/* |
18 |
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* Arguments to this material include optional diffuse colors. |
19 |
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* String arguments include the BSDF and function files. |
20 |
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* A thickness variable causes the strange but useful behavior |
21 |
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* of translating transmitted rays this distance past the surface |
22 |
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* intersection in the normal direction to bypass intervening geometry. |
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* This only affects scattered, non-source directed samples. Thus, |
24 |
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* thickness is relevant only if there is a transmitted component. |
25 |
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* A positive thickness has the further side-effect that an unscattered |
26 |
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* (view) ray will pass right through our material if it has any |
27 |
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* non-diffuse transmission, making our BSDF invisible. This allows the |
28 |
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* underlying geometry to become visible. A matching surface should be |
29 |
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* placed on the other side, less than the thickness away, if the backside |
30 |
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* reflectance is non-zero. |
31 |
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* The "up" vector for the BSDF is given by three variables, defined |
32 |
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* (along with the thickness) by the named function file, or '.' if none. |
33 |
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* Together with the surface normal, this defines the local coordinate |
34 |
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* system for the BSDF. |
35 |
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* We do not reorient the surface, so if the BSDF has no back-side |
36 |
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* reflectance and none is given in the real arguments, the surface will |
37 |
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* appear as black when viewed from behind (unless backvis is false). |
38 |
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* The diffuse compnent arguments are added to components in the BSDF file, |
39 |
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* not multiplied. However, patterns affect this material as a multiplier |
40 |
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* on everything except non-diffuse reflection. |
41 |
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* |
42 |
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* Arguments for MAT_BSDF are: |
43 |
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* 6+ thick BSDFfile ux uy uz funcfile transform |
44 |
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* 0 |
45 |
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* 0|3|9 rdf gdf bdf |
46 |
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* rdb gdb bdb |
47 |
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* rdt gdt bdt |
48 |
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*/ |
49 |
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50 |
greg |
2.4 |
/* |
51 |
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* Note that our reverse ray-tracing process means that the positions |
52 |
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* of incoming and outgoing vectors may be reversed in our calls |
53 |
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* to the BSDF library. This is fine, since the bidirectional nature |
54 |
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* of the BSDF (that's what the 'B' stands for) means it all works out. |
55 |
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*/ |
56 |
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57 |
greg |
2.1 |
typedef struct { |
58 |
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OBJREC *mp; /* material pointer */ |
59 |
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RAY *pr; /* intersected ray */ |
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FVECT pnorm; /* perturbed surface normal */ |
61 |
greg |
2.4 |
FVECT vray; /* local outgoing (return) vector */ |
62 |
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double sr_vpsa; /* sqrt of BSDF projected solid angle */ |
63 |
greg |
2.1 |
RREAL toloc[3][3]; /* world to local BSDF coords */ |
64 |
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RREAL fromloc[3][3]; /* local BSDF coords to world */ |
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double thick; /* surface thickness */ |
66 |
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SDData *sd; /* loaded BSDF data */ |
67 |
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COLOR runsamp; /* BSDF hemispherical reflection */ |
68 |
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COLOR rdiff; /* added diffuse reflection */ |
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COLOR tunsamp; /* BSDF hemispherical transmission */ |
70 |
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COLOR tdiff; /* added diffuse transmission */ |
71 |
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} BSDFDAT; /* BSDF material data */ |
72 |
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73 |
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#define cvt_sdcolor(cv, svp) ccy2rgb(&(svp)->spec, (svp)->cieY, cv) |
74 |
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75 |
greg |
2.4 |
/* Jitter ray sample according to projected solid angle and specjitter */ |
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static void |
77 |
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bsdf_jitter(FVECT vres, BSDFDAT *ndp) |
78 |
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{ |
79 |
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double sr_psa = ndp->sr_vpsa; |
80 |
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81 |
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VCOPY(vres, ndp->vray); |
82 |
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if (specjitter < 1.) |
83 |
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sr_psa *= specjitter; |
84 |
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if (sr_psa <= FTINY) |
85 |
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return; |
86 |
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vres[0] += sr_psa*(.5 - frandom()); |
87 |
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vres[1] += sr_psa*(.5 - frandom()); |
88 |
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normalize(vres); |
89 |
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} |
90 |
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91 |
greg |
2.1 |
/* Compute source contribution for BSDF */ |
92 |
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static void |
93 |
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dirbsdf( |
94 |
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COLOR cval, /* returned coefficient */ |
95 |
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void *nnp, /* material data */ |
96 |
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FVECT ldir, /* light source direction */ |
97 |
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double omega /* light source size */ |
98 |
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) |
99 |
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{ |
100 |
greg |
2.3 |
BSDFDAT *np = (BSDFDAT *)nnp; |
101 |
greg |
2.1 |
SDError ec; |
102 |
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SDValue sv; |
103 |
greg |
2.4 |
FVECT vsrc; |
104 |
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FVECT vjit; |
105 |
greg |
2.1 |
double ldot; |
106 |
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double dtmp; |
107 |
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COLOR ctmp; |
108 |
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109 |
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setcolor(cval, .0, .0, .0); |
110 |
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111 |
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ldot = DOT(np->pnorm, ldir); |
112 |
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if ((-FTINY <= ldot) & (ldot <= FTINY)) |
113 |
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return; |
114 |
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115 |
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if (ldot > .0 && bright(np->rdiff) > FTINY) { |
116 |
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/* |
117 |
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* Compute added diffuse reflected component. |
118 |
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*/ |
119 |
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copycolor(ctmp, np->rdiff); |
120 |
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dtmp = ldot * omega * (1./PI); |
121 |
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scalecolor(ctmp, dtmp); |
122 |
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addcolor(cval, ctmp); |
123 |
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} |
124 |
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if (ldot < .0 && bright(np->tdiff) > FTINY) { |
125 |
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/* |
126 |
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* Compute added diffuse transmission. |
127 |
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*/ |
128 |
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copycolor(ctmp, np->tdiff); |
129 |
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dtmp = -ldot * omega * (1.0/PI); |
130 |
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scalecolor(ctmp, dtmp); |
131 |
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addcolor(cval, ctmp); |
132 |
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} |
133 |
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/* |
134 |
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* Compute scattering coefficient using BSDF. |
135 |
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*/ |
136 |
greg |
2.4 |
if (SDmapDir(vsrc, np->toloc, ldir) != SDEnone) |
137 |
greg |
2.1 |
return; |
138 |
greg |
2.4 |
bsdf_jitter(vjit, np); |
139 |
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ec = SDevalBSDF(&sv, vjit, vsrc, np->sd); |
140 |
greg |
2.1 |
if (ec) |
141 |
greg |
2.2 |
objerror(np->mp, USER, transSDError(ec)); |
142 |
greg |
2.1 |
|
143 |
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if (sv.cieY <= FTINY) /* not worth using? */ |
144 |
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return; |
145 |
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cvt_sdcolor(ctmp, &sv); |
146 |
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if (ldot > .0) { /* pattern only diffuse reflection */ |
147 |
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COLOR ctmp1, ctmp2; |
148 |
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dtmp = (np->pr->rod > .0) ? np->sd->rLambFront.cieY |
149 |
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: np->sd->rLambBack.cieY; |
150 |
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dtmp /= PI * sv.cieY; /* diffuse fraction */ |
151 |
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copycolor(ctmp2, np->pr->pcol); |
152 |
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scalecolor(ctmp2, dtmp); |
153 |
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setcolor(ctmp1, 1.-dtmp, 1.-dtmp, 1.-dtmp); |
154 |
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addcolor(ctmp1, ctmp2); |
155 |
greg |
2.3 |
multcolor(ctmp, ctmp1); /* apply derated pattern */ |
156 |
greg |
2.1 |
dtmp = ldot * omega; |
157 |
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} else { /* full pattern on transmission */ |
158 |
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multcolor(ctmp, np->pr->pcol); |
159 |
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dtmp = -ldot * omega; |
160 |
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} |
161 |
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scalecolor(ctmp, dtmp); |
162 |
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addcolor(cval, ctmp); |
163 |
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} |
164 |
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165 |
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/* Sample separate BSDF component */ |
166 |
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static int |
167 |
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sample_sdcomp(BSDFDAT *ndp, SDComponent *dcp, int usepat) |
168 |
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{ |
169 |
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int nstarget = 1; |
170 |
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int nsent = 0; |
171 |
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SDError ec; |
172 |
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SDValue bsv; |
173 |
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double sthick; |
174 |
greg |
2.4 |
FVECT vjit, vsmp; |
175 |
greg |
2.1 |
RAY sr; |
176 |
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int ntrials; |
177 |
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/* multiple samples? */ |
178 |
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if (specjitter > 1.5) { |
179 |
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nstarget = specjitter*ndp->pr->rweight + .5; |
180 |
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if (nstarget < 1) |
181 |
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nstarget = 1; |
182 |
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} |
183 |
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/* run through our trials */ |
184 |
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for (ntrials = 0; nsent < nstarget && ntrials < 9*nstarget; ntrials++) { |
185 |
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SDerrorDetail[0] = '\0'; |
186 |
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/* sample direction & coef. */ |
187 |
greg |
2.4 |
bsdf_jitter(vjit, ndp); |
188 |
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ec = SDsampComponent(&bsv, vsmp, vjit, ntrials ? frandom() |
189 |
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: urand(ilhash(dimlist,ndims)+samplendx), dcp); |
190 |
greg |
2.1 |
if (ec) |
191 |
greg |
2.2 |
objerror(ndp->mp, USER, transSDError(ec)); |
192 |
greg |
2.1 |
/* zero component? */ |
193 |
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if (bsv.cieY <= FTINY) |
194 |
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break; |
195 |
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/* map vector to world */ |
196 |
greg |
2.4 |
if (SDmapDir(sr.rdir, ndp->fromloc, vsmp) != SDEnone) |
197 |
greg |
2.1 |
break; |
198 |
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/* unintentional penetration? */ |
199 |
greg |
2.4 |
if (DOT(sr.rdir, ndp->pr->ron) > .0 ^ vsmp[2] > .0) |
200 |
greg |
2.1 |
continue; |
201 |
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/* spawn a specular ray */ |
202 |
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if (nstarget > 1) |
203 |
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bsv.cieY /= (double)nstarget; |
204 |
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cvt_sdcolor(sr.rcoef, &bsv); /* use color */ |
205 |
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if (usepat) /* pattern on transmission */ |
206 |
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multcolor(sr.rcoef, ndp->pr->pcol); |
207 |
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if (rayorigin(&sr, SPECULAR, ndp->pr, sr.rcoef) < 0) { |
208 |
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if (maxdepth > 0) |
209 |
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break; |
210 |
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++nsent; /* Russian roulette victim */ |
211 |
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continue; |
212 |
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} |
213 |
greg |
2.3 |
if (ndp->thick > FTINY) { /* need to move origin? */ |
214 |
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sthick = (ndp->pr->rod > .0) ? -ndp->thick : ndp->thick; |
215 |
greg |
2.4 |
if (sthick < .0 ^ vsmp[2] > .0) |
216 |
greg |
2.3 |
VSUM(sr.rorg, sr.rorg, ndp->pr->ron, sthick); |
217 |
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} |
218 |
greg |
2.1 |
rayvalue(&sr); /* send & evaluate sample */ |
219 |
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multcolor(sr.rcol, sr.rcoef); |
220 |
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addcolor(ndp->pr->rcol, sr.rcol); |
221 |
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++nsent; |
222 |
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} |
223 |
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return(nsent); |
224 |
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} |
225 |
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226 |
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/* Sample non-diffuse components of BSDF */ |
227 |
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static int |
228 |
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sample_sdf(BSDFDAT *ndp, int sflags) |
229 |
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{ |
230 |
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int n, ntotal = 0; |
231 |
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SDSpectralDF *dfp; |
232 |
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COLORV *unsc; |
233 |
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234 |
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if (sflags == SDsampSpT) { |
235 |
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unsc = ndp->tunsamp; |
236 |
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dfp = ndp->sd->tf; |
237 |
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cvt_sdcolor(unsc, &ndp->sd->tLamb); |
238 |
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} else /* sflags == SDsampSpR */ { |
239 |
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unsc = ndp->runsamp; |
240 |
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if (ndp->pr->rod > .0) { |
241 |
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dfp = ndp->sd->rf; |
242 |
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cvt_sdcolor(unsc, &ndp->sd->rLambFront); |
243 |
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} else { |
244 |
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dfp = ndp->sd->rb; |
245 |
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cvt_sdcolor(unsc, &ndp->sd->rLambBack); |
246 |
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} |
247 |
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} |
248 |
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multcolor(unsc, ndp->pr->pcol); |
249 |
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if (dfp == NULL) /* no specular component? */ |
250 |
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return(0); |
251 |
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/* below sampling threshold? */ |
252 |
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if (dfp->maxHemi <= specthresh+FTINY) { |
253 |
greg |
2.3 |
if (dfp->maxHemi > FTINY) { /* XXX no color from BSDF */ |
254 |
greg |
2.4 |
FVECT vjit; |
255 |
|
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double d; |
256 |
greg |
2.1 |
COLOR ctmp; |
257 |
greg |
2.4 |
bsdf_jitter(vjit, ndp); |
258 |
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d = SDdirectHemi(vjit, sflags, ndp->sd); |
259 |
greg |
2.1 |
if (sflags == SDsampSpT) { |
260 |
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copycolor(ctmp, ndp->pr->pcol); |
261 |
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scalecolor(ctmp, d); |
262 |
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} else /* no pattern on reflection */ |
263 |
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setcolor(ctmp, d, d, d); |
264 |
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addcolor(unsc, ctmp); |
265 |
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} |
266 |
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return(0); |
267 |
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} |
268 |
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/* else need to sample */ |
269 |
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dimlist[ndims++] = (int)(size_t)ndp->mp; |
270 |
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ndims++; |
271 |
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for (n = dfp->ncomp; n--; ) { /* loop over components */ |
272 |
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dimlist[ndims-1] = n + 9438; |
273 |
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ntotal += sample_sdcomp(ndp, &dfp->comp[n], sflags==SDsampSpT); |
274 |
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} |
275 |
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ndims -= 2; |
276 |
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return(ntotal); |
277 |
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} |
278 |
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279 |
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/* Color a ray that hit a BSDF material */ |
280 |
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int |
281 |
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m_bsdf(OBJREC *m, RAY *r) |
282 |
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{ |
283 |
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COLOR ctmp; |
284 |
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SDError ec; |
285 |
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FVECT upvec, outVec; |
286 |
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MFUNC *mf; |
287 |
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BSDFDAT nd; |
288 |
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/* check arguments */ |
289 |
|
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if ((m->oargs.nsargs < 6) | (m->oargs.nfargs > 9) | |
290 |
|
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(m->oargs.nfargs % 3)) |
291 |
|
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objerror(m, USER, "bad # arguments"); |
292 |
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|
293 |
greg |
2.2 |
/* get BSDF data */ |
294 |
|
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nd.sd = loadBSDF(m->oargs.sarg[1]); |
295 |
greg |
2.1 |
/* load cal file */ |
296 |
|
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mf = getfunc(m, 5, 0x1d, 1); |
297 |
|
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/* get thickness */ |
298 |
|
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nd.thick = evalue(mf->ep[0]); |
299 |
|
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if (nd.thick < .0) |
300 |
|
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nd.thick = .0; |
301 |
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/* check shadow */ |
302 |
|
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if (r->crtype & SHADOW) { |
303 |
greg |
2.3 |
if ((nd.thick > FTINY) & (nd.sd->tf != NULL)) |
304 |
|
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raytrans(r); /* pass-through */ |
305 |
greg |
2.1 |
SDfreeCache(nd.sd); |
306 |
|
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return(1); /* else shadow */ |
307 |
|
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} |
308 |
|
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/* check unscattered ray */ |
309 |
greg |
2.3 |
if (!(r->crtype & (SPECULAR|AMBIENT)) && |
310 |
|
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(nd.thick > FTINY) & (nd.sd->tf != NULL)) { |
311 |
greg |
2.1 |
SDfreeCache(nd.sd); |
312 |
|
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raytrans(r); /* pass-through */ |
313 |
|
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return(1); |
314 |
|
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} |
315 |
|
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/* diffuse reflectance */ |
316 |
|
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if (r->rod > .0) { |
317 |
|
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if (m->oargs.nfargs < 3) |
318 |
|
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setcolor(nd.rdiff, .0, .0, .0); |
319 |
|
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else |
320 |
|
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setcolor(nd.rdiff, m->oargs.farg[0], |
321 |
|
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m->oargs.farg[1], |
322 |
|
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m->oargs.farg[2]); |
323 |
|
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} else { |
324 |
|
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if (m->oargs.nfargs < 6) { /* check invisible backside */ |
325 |
greg |
2.3 |
if (!backvis && (nd.sd->rb == NULL) & |
326 |
|
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(nd.sd->tf == NULL)) { |
327 |
greg |
2.1 |
SDfreeCache(nd.sd); |
328 |
|
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raytrans(r); |
329 |
|
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return(1); |
330 |
|
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} |
331 |
|
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setcolor(nd.rdiff, .0, .0, .0); |
332 |
|
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} else |
333 |
|
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setcolor(nd.rdiff, m->oargs.farg[3], |
334 |
|
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m->oargs.farg[4], |
335 |
|
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m->oargs.farg[5]); |
336 |
|
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} |
337 |
|
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/* diffuse transmittance */ |
338 |
|
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if (m->oargs.nfargs < 9) |
339 |
|
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setcolor(nd.tdiff, .0, .0, .0); |
340 |
|
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else |
341 |
|
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setcolor(nd.tdiff, m->oargs.farg[6], |
342 |
|
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m->oargs.farg[7], |
343 |
|
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m->oargs.farg[8]); |
344 |
|
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nd.mp = m; |
345 |
|
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nd.pr = r; |
346 |
|
|
/* get modifiers */ |
347 |
|
|
raytexture(r, m->omod); |
348 |
|
|
if (bright(r->pcol) <= FTINY) { /* black pattern?! */ |
349 |
|
|
SDfreeCache(nd.sd); |
350 |
|
|
return(1); |
351 |
|
|
} |
352 |
|
|
/* modify diffuse values */ |
353 |
|
|
multcolor(nd.rdiff, r->pcol); |
354 |
|
|
multcolor(nd.tdiff, r->pcol); |
355 |
|
|
/* get up vector */ |
356 |
|
|
upvec[0] = evalue(mf->ep[1]); |
357 |
|
|
upvec[1] = evalue(mf->ep[2]); |
358 |
|
|
upvec[2] = evalue(mf->ep[3]); |
359 |
|
|
/* return to world coords */ |
360 |
|
|
if (mf->f != &unitxf) { |
361 |
|
|
multv3(upvec, upvec, mf->f->xfm); |
362 |
|
|
nd.thick *= mf->f->sca; |
363 |
|
|
} |
364 |
|
|
raynormal(nd.pnorm, r); |
365 |
|
|
/* compute local BSDF xform */ |
366 |
|
|
ec = SDcompXform(nd.toloc, nd.pnorm, upvec); |
367 |
|
|
if (!ec) { |
368 |
greg |
2.4 |
nd.vray[0] = -r->rdir[0]; |
369 |
|
|
nd.vray[1] = -r->rdir[1]; |
370 |
|
|
nd.vray[2] = -r->rdir[2]; |
371 |
|
|
ec = SDmapDir(nd.vray, nd.toloc, nd.vray); |
372 |
greg |
2.1 |
} |
373 |
|
|
if (!ec) |
374 |
|
|
ec = SDinvXform(nd.fromloc, nd.toloc); |
375 |
greg |
2.4 |
/* determine BSDF resolution */ |
376 |
|
|
if (!ec) |
377 |
|
|
ec = SDsizeBSDF(&nd.sr_vpsa, nd.vray, SDqueryMin, nd.sd); |
378 |
|
|
if (!ec) |
379 |
|
|
nd.sr_vpsa = sqrt(nd.sr_vpsa); |
380 |
|
|
else { |
381 |
greg |
2.2 |
objerror(m, WARNING, transSDError(ec)); |
382 |
greg |
2.1 |
SDfreeCache(nd.sd); |
383 |
|
|
return(1); |
384 |
|
|
} |
385 |
greg |
2.4 |
|
386 |
greg |
2.1 |
if (r->rod < .0) { /* perturb normal towards hit */ |
387 |
|
|
nd.pnorm[0] = -nd.pnorm[0]; |
388 |
|
|
nd.pnorm[1] = -nd.pnorm[1]; |
389 |
|
|
nd.pnorm[2] = -nd.pnorm[2]; |
390 |
|
|
} |
391 |
|
|
/* sample reflection */ |
392 |
|
|
sample_sdf(&nd, SDsampSpR); |
393 |
|
|
/* sample transmission */ |
394 |
|
|
sample_sdf(&nd, SDsampSpT); |
395 |
|
|
/* compute indirect diffuse */ |
396 |
|
|
copycolor(ctmp, nd.rdiff); |
397 |
|
|
addcolor(ctmp, nd.runsamp); |
398 |
|
|
if (bright(ctmp) > FTINY) { /* ambient from this side */ |
399 |
|
|
if (r->rod < .0) |
400 |
|
|
flipsurface(r); |
401 |
|
|
multambient(ctmp, r, nd.pnorm); |
402 |
|
|
addcolor(r->rcol, ctmp); |
403 |
|
|
if (r->rod < .0) |
404 |
|
|
flipsurface(r); |
405 |
|
|
} |
406 |
|
|
copycolor(ctmp, nd.tdiff); |
407 |
|
|
addcolor(ctmp, nd.tunsamp); |
408 |
|
|
if (bright(ctmp) > FTINY) { /* ambient from other side */ |
409 |
|
|
FVECT bnorm; |
410 |
|
|
if (r->rod > .0) |
411 |
|
|
flipsurface(r); |
412 |
|
|
bnorm[0] = -nd.pnorm[0]; |
413 |
|
|
bnorm[1] = -nd.pnorm[1]; |
414 |
|
|
bnorm[2] = -nd.pnorm[2]; |
415 |
|
|
multambient(ctmp, r, bnorm); |
416 |
|
|
addcolor(r->rcol, ctmp); |
417 |
|
|
if (r->rod > .0) |
418 |
|
|
flipsurface(r); |
419 |
|
|
} |
420 |
|
|
/* add direct component */ |
421 |
|
|
direct(r, dirbsdf, &nd); |
422 |
|
|
/* clean up */ |
423 |
|
|
SDfreeCache(nd.sd); |
424 |
|
|
return(1); |
425 |
|
|
} |