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#include "mkillum.h" |
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#include "paths.h" |
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#include "random.h" |
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#include "ezxml.h" |
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|
12 |
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#define MAXLATS 46 /* maximum number of latitudes */ |
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|
14 |
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/* BSDF angle specification (terminate with nphi = -1) */ |
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typedef struct { |
16 |
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char name[32]; /* basis name */ |
17 |
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int nangles; /* total number of directions */ |
18 |
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struct { |
19 |
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float tmin; /* starting theta */ |
20 |
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short nphis; /* number of phis (0 term) */ |
21 |
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} lat[MAXLATS+1]; /* latitudes */ |
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} ANGLE_BASIS; |
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|
24 |
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#define NABASES 3 /* number of predefined bases */ |
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|
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ANGLE_BASIS abase_list[NABASES] = { |
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{ |
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"LBNL/Klems Full", 145, |
29 |
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{ {-5., 1}, |
30 |
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{5., 8}, |
31 |
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{15., 16}, |
32 |
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{25., 20}, |
33 |
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{35., 24}, |
34 |
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{45., 24}, |
35 |
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{55., 24}, |
36 |
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{65., 16}, |
37 |
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{75., 12}, |
38 |
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{90., 0} } |
39 |
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}, { |
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"LBNL/Klems Half", 73, |
41 |
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{ {-6.5, 1}, |
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{6.5, 8}, |
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{19.5, 12}, |
44 |
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{32.5, 16}, |
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{46.5, 20}, |
46 |
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{61.5, 12}, |
47 |
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{76.5, 4}, |
48 |
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{90., 0} } |
49 |
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}, { |
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"LBNL/Klems Quarter", 41, |
51 |
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{ {-9., 1}, |
52 |
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{9., 8}, |
53 |
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{27., 12}, |
54 |
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{46., 12}, |
55 |
+ |
{66., 8}, |
56 |
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{90., 0} } |
57 |
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} |
58 |
+ |
}; |
59 |
+ |
|
60 |
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|
61 |
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static int |
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ab_getvec( /* get vector for this angle basis index */ |
63 |
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FVECT v, |
64 |
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int ndx, |
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void *p |
66 |
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) |
67 |
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{ |
68 |
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ANGLE_BASIS *ab = (ANGLE_BASIS *)p; |
69 |
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int li; |
70 |
+ |
double alt, azi, d; |
71 |
+ |
|
72 |
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if ((ndx < 0) | (ndx >= ab->nangles)) |
73 |
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return(0); |
74 |
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for (li = 0; ndx >= ab->lat[li].nphis; li++) |
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ndx -= ab->lat[li].nphis; |
76 |
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alt = PI/180.*0.5*(ab->lat[li].tmin + ab->lat[li+1].tmin); |
77 |
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azi = 2.*PI*ndx/ab->lat[li].nphis; |
78 |
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d = sin(alt); |
79 |
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v[0] = cos(azi)*d; |
80 |
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v[1] = sin(azi)*d; |
81 |
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v[2] = cos(alt); |
82 |
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return(1); |
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+ |
} |
84 |
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|
85 |
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|
86 |
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static int |
87 |
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ab_getndx( /* get index corresponding to the given vector */ |
88 |
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FVECT v, |
89 |
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void *p |
90 |
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) |
91 |
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{ |
92 |
+ |
ANGLE_BASIS *ab = (ANGLE_BASIS *)p; |
93 |
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int li, ndx; |
94 |
+ |
double alt, azi, d; |
95 |
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|
96 |
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if ((v[2] < 0.0) | (v[2] > 1.0)) |
97 |
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return(-1); |
98 |
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alt = 180.0/PI*acos(v[2]); |
99 |
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azi = 180.0/PI*atan2(v[1], v[0]); |
100 |
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if (azi < 0.0) azi += 360.0; |
101 |
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for (li = 1; ab->lat[li].tmin <= alt; li++) |
102 |
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if (!ab->lat[li].nphis) |
103 |
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return(-1); |
104 |
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--li; |
105 |
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ndx = (int)((1./360.)*azi*ab->lat[li].nphis + 0.5); |
106 |
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if (ndx >= ab->lat[li].nphis) ndx = 0; |
107 |
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while (li--) |
108 |
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ndx += ab->lat[li].nphis; |
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return(ndx); |
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} |
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|
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|
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static double |
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ab_getohm( /* get solid angle for this angle basis index */ |
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int ndx, |
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void *p |
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) |
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{ |
119 |
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ANGLE_BASIS *ab = (ANGLE_BASIS *)p; |
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int li; |
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double tdia, pdia; |
122 |
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|
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if ((ndx < 0) | (ndx >= ab->nangles)) |
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return(0); |
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for (li = 0; ndx >= ab->lat[li].nphis; li++) |
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ndx -= ab->lat[li].nphis; |
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tdia = PI/180.*(ab->lat[li+1].tmin - ab->lat[li].tmin); |
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pdia = 2.*PI/ab->lat[li].nphis; |
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return(tdia*pdia); |
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} |
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|
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|
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static int |
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ab_getvecR( /* get reverse vector for this angle basis index */ |
135 |
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FVECT v, |
136 |
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int ndx, |
137 |
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void *p |
138 |
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) |
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{ |
140 |
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if (!ab_getvec(v, ndx, p)) |
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return(0); |
142 |
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|
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v[0] = -v[0]; |
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v[1] = -v[1]; |
145 |
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|
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return(1); |
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} |
148 |
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|
149 |
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|
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static int |
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ab_getndxR( /* get index corresponding to the reverse vector */ |
152 |
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FVECT v, |
153 |
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void *p |
154 |
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) |
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{ |
156 |
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FVECT v2; |
157 |
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|
158 |
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v2[0] = -v[0]; |
159 |
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v2[1] = -v[1]; |
160 |
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v2[2] = v[2]; |
161 |
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|
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return ab_getndx(v2, p); |
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} |
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|
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static void |
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load_bsdf_data( /* load BSDF distribution for this wavelength */ |
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struct BSDF_data *dp, |
168 |
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ezxml_t wdb |
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) |
170 |
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{ |
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const char *cbasis = ezxml_txt(ezxml_child(wdb,"ColumnAngleBasis")); |
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const char *rbasis = ezxml_txt(ezxml_child(wdb,"RowAngleBasis")); |
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int i; |
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|
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for (i = NABASES; i--; ) |
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if (!strcmp(cbasis, abase_list[i].name)) { |
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dp->ninc = abase_list[i].nangles; |
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dp->ib_priv = (void *)&abase_list[i]; |
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dp->ib_vec = ab_getvec; |
180 |
+ |
dp->ib_ndx = ab_getndx; |
181 |
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dp->ib_ohm = ab_getohm; |
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break; |
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} |
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if (i < 0) { |
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sprintf(errmsg, "unsupported incident basis '%s'", cbasis); |
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error(INTERNAL, errmsg); |
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} |
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for (i = NABASES; i--; ) |
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if (!strcmp(rbasis, abase_list[i].name)) { |
190 |
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dp->nout = abase_list[i].nangles; |
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dp->ob_priv = (void *)&abase_list[i]; |
192 |
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dp->ob_vec = ab_getvecR; |
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dp->ob_ndx = ab_getndxR; |
194 |
+ |
dp->ob_ohm = ab_getohm; |
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+ |
break; |
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+ |
} |
197 |
+ |
if (i < 0) { |
198 |
+ |
sprintf(errmsg, "unsupported exitant basis '%s'", cbasis); |
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+ |
error(INTERNAL, errmsg); |
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+ |
} |
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} |
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+ |
|
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+ |
|
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struct BSDF_data * |
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load_BSDF( /* load BSDF data from file */ |
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char *fname |
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|
error(WARNING, errmsg); |
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return(NULL); |
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} |
225 |
+ |
if (ezxml_error(fl)[0]) { |
226 |
+ |
sprintf(errmsg, "BSDF \"%s\": %s", path, ezxml_error(fl)); |
227 |
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error(WARNING, errmsg); |
228 |
+ |
ezxml_free(fl); |
229 |
+ |
return(NULL); |
230 |
+ |
} |
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dp = (struct BSDF_data *)calloc(1, sizeof(struct BSDF_data)); |
36 |
– |
if (dp == NULL) |
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goto memerr; |
232 |
|
for (wld = ezxml_child(fl, "WavelengthData"); |
233 |
|
fl != NULL; fl = fl->next) { |
234 |
< |
if (strcmp(ezxml_child(wld, "Wavelength")->txt, "Visible")) |
234 |
> |
if (strcmp(ezxml_txt(ezxml_child(wld,"Wavelength")), "Visible")) |
235 |
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continue; |
236 |
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wdb = ezxml_child(wld, "WavelengthDataBlock"); |
237 |
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if (wdb == NULL) continue; |
238 |
< |
if (strcmp(ezxml_child(wdb, "WavelengthDataDirection")->txt, |
238 |
> |
if (strcmp(ezxml_txt(ezxml_child(wdb,"WavelengthDataDirection")), |
239 |
|
"Transmission Front")) |
240 |
|
continue; |
241 |
+ |
load_bsdf_data(dp, wdb); /* load front BTDF */ |
242 |
+ |
break; /* ignore the rest */ |
243 |
|
} |
244 |
< |
/* etc... */ |
245 |
< |
ezxml_free(fl); |
244 |
> |
ezxml_free(fl); /* done with XML file */ |
245 |
> |
if (dp->bsdf == NULL) { |
246 |
> |
sprintf(errmsg, "bad/missing BTDF data in \"%s\"", path); |
247 |
> |
error(WARNING, errmsg); |
248 |
> |
free_BSDF(dp); |
249 |
> |
dp = NULL; |
250 |
> |
} |
251 |
|
return(dp); |
51 |
– |
memerr: |
52 |
– |
error(SYSTEM, "out of memory in load_BSDF"); |
53 |
– |
return NULL; /* pro forma return */ |
252 |
|
} |
253 |
|
|
254 |
|
|
259 |
|
{ |
260 |
|
if (b == NULL) |
261 |
|
return; |
262 |
< |
free(b->bsdf); |
262 |
> |
if (b->bsdf != NULL) |
263 |
> |
free(b->bsdf); |
264 |
|
free(b); |
265 |
|
} |
266 |
|
|
267 |
|
|
268 |
< |
void |
268 |
> |
int |
269 |
|
r_BSDF_incvec( /* compute random input vector at given location */ |
270 |
|
FVECT v, |
271 |
|
struct BSDF_data *b, |
278 |
|
double rad; |
279 |
|
int j; |
280 |
|
|
281 |
< |
getBSDF_incvec(v, b, i); |
282 |
< |
rad = getBSDF_incrad(b, i); |
281 |
> |
if (!getBSDF_incvec(v, b, i)) |
282 |
> |
return(0); |
283 |
> |
rad = sqrt(getBSDF_incohm(b, i) / PI); |
284 |
|
multisamp(pert, 3, rv); |
285 |
|
for (j = 0; j < 3; j++) |
286 |
|
v[j] += rad*(2.*pert[j] - 1.); |
287 |
|
if (xm != NULL) |
288 |
|
multv3(v, v, xm); |
289 |
|
normalize(v); |
290 |
+ |
return(1); |
291 |
|
} |
292 |
|
|
293 |
|
|
294 |
< |
void |
294 |
> |
int |
295 |
|
r_BSDF_outvec( /* compute random output vector at given location */ |
296 |
|
FVECT v, |
297 |
|
struct BSDF_data *b, |
304 |
|
double rad; |
305 |
|
int j; |
306 |
|
|
307 |
< |
getBSDF_outvec(v, b, o); |
308 |
< |
rad = getBSDF_outrad(b, o); |
307 |
> |
if (!getBSDF_outvec(v, b, o)) |
308 |
> |
return(0); |
309 |
> |
rad = sqrt(getBSDF_outohm(b, o) / PI); |
310 |
|
multisamp(pert, 3, rv); |
311 |
|
for (j = 0; j < 3; j++) |
312 |
|
v[j] += rad*(2.*pert[j] - 1.); |
313 |
|
if (xm != NULL) |
314 |
|
multv3(v, v, xm); |
315 |
|
normalize(v); |
316 |
+ |
return(1); |
317 |
|
} |
318 |
|
|
319 |
|
|
356 |
|
|
357 |
|
|
358 |
|
int |
359 |
< |
getBSDF_xfm( /* compute transform for the given surface */ |
359 |
> |
getBSDF_xfm( /* compute BSDF orient. -> world orient. transform */ |
360 |
|
MAT4 xm, |
361 |
|
FVECT nrm, |
362 |
|
UpDir ud |
411 |
|
MAT4 xm |
412 |
|
) |
413 |
|
{ |
414 |
+ |
int nout = 0; |
415 |
|
MAT4 mymat, inmat; |
416 |
|
COLORV *idist; |
417 |
|
COLORV *cp, *csum; |
418 |
|
FVECT dv; |
419 |
|
double wt; |
420 |
< |
int i, j, k, h; |
420 |
> |
int i, j, k, o; |
421 |
|
COLOR col, cinc; |
422 |
|
/* copy incoming distribution */ |
423 |
|
if (b->ninc != distsiz) |
451 |
|
getBSDF_incvec(dv, b, i); /* compute incident irrad. */ |
452 |
|
multv3(dv, dv, mymat); |
453 |
|
if (dv[2] < 0.0) dv[2] = -dv[2]; |
454 |
< |
wt = getBSDF_incrad(b, i); |
455 |
< |
wt *= wt*PI * dv[2]; /* solid_angle*cosine(theta) */ |
454 |
> |
wt = getBSDF_incohm(b, i); |
455 |
> |
wt *= dv[2]; /* solid_angle*cosine(theta) */ |
456 |
|
cp = &idist[3*i]; |
457 |
|
copycolor(cinc, cp); |
458 |
|
scalecolor(cinc, wt); |
461 |
|
flatdir(dv, (k + .5)/nalt, (double)j/nazi); |
462 |
|
multv3(dv, dv, inmat); |
463 |
|
/* evaluate BSDF @ outgoing */ |
464 |
< |
wt = BSDF_visible(b, i, getBSDF_outndx(b, dv)); |
464 |
> |
o = getBSDF_outndx(b, dv); |
465 |
> |
if (o < 0) { |
466 |
> |
nout++; |
467 |
> |
continue; |
468 |
> |
} |
469 |
> |
wt = BSDF_visible(b, i, o); |
470 |
|
copycolor(col, cinc); |
471 |
|
scalecolor(col, wt); |
472 |
|
csum = &distarr[3*(k*nazi + j)]; |
474 |
|
} |
475 |
|
} |
476 |
|
free(idist); /* free temp space */ |
477 |
+ |
if (nout) { |
478 |
+ |
sprintf(errmsg, "missing %.1f%% of BSDF directions", |
479 |
+ |
100.*nout/(b->ninc*nalt*nazi)); |
480 |
+ |
error(WARNING, errmsg); |
481 |
+ |
} |
482 |
|
} |