1 |
greg |
2.1 |
#ifndef lint |
2 |
greg |
2.24 |
static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.23 2013/11/26 17:35:59 greg Exp $"; |
3 |
greg |
2.1 |
#endif |
4 |
|
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/* |
5 |
|
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* Load measured BSDF interpolant and write out as XML file with tensor tree. |
6 |
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* |
7 |
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* G. Ward |
8 |
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*/ |
9 |
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10 |
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#define _USE_MATH_DEFINES |
11 |
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#include <stdio.h> |
12 |
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#include <stdlib.h> |
13 |
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#include <math.h> |
14 |
greg |
2.23 |
#include "random.h" |
15 |
greg |
2.1 |
#include "platform.h" |
16 |
greg |
2.22 |
#include "rtprocess.h" |
17 |
greg |
2.11 |
#include "calcomp.h" |
18 |
greg |
2.1 |
#include "bsdfrep.h" |
19 |
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/* global argv[0] */ |
20 |
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char *progname; |
21 |
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/* percentage to cull (<0 to turn off) */ |
22 |
greg |
2.7 |
double pctcull = 90.; |
23 |
greg |
2.1 |
/* sampling order */ |
24 |
|
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int samp_order = 6; |
25 |
greg |
2.15 |
/* super-sampling threshold */ |
26 |
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const double ssamp_thresh = 0.35; |
27 |
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/* number of super-samples */ |
28 |
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const int nssamp = 100; |
29 |
greg |
2.18 |
/* limit on number of RBF lobes */ |
30 |
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static int lobe_lim = 15000; |
31 |
greg |
2.1 |
|
32 |
greg |
2.11 |
/* Output XML prologue to stdout */ |
33 |
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static void |
34 |
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xml_prologue(int ac, char *av[]) |
35 |
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{ |
36 |
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puts("<?xml version=\"1.0\" encoding=\"UTF-8\"?>"); |
37 |
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puts("<WindowElement xmlns=\"http://windows.lbl.gov\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://windows.lbl.gov/BSDF-v1.4.xsd\">"); |
38 |
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fputs("<!-- File produced by:", stdout); |
39 |
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while (ac-- > 0) { |
40 |
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fputc(' ', stdout); |
41 |
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fputs(*av++, stdout); |
42 |
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} |
43 |
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puts(" -->"); |
44 |
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puts("<WindowElementType>System</WindowElementType>"); |
45 |
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puts("<FileType>BSDF</FileType>"); |
46 |
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puts("<Optical>"); |
47 |
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puts("<Layer>"); |
48 |
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puts("\t<Material>"); |
49 |
greg |
2.21 |
printf("\t\t<Name>%s</Name>\n", bsdf_name[0] ? bsdf_name : "Unknown"); |
50 |
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printf("\t\t<Manufacturer>%s</Manufacturer>\n", |
51 |
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bsdf_manuf[0] ? bsdf_manuf : "Unknown"); |
52 |
greg |
2.11 |
puts("\t\t<DeviceType>Other</DeviceType>"); |
53 |
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puts("\t</Material>"); |
54 |
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puts("\t<DataDefinition>"); |
55 |
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printf("\t\t<IncidentDataStructure>TensorTree%c</IncidentDataStructure>\n", |
56 |
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single_plane_incident ? '3' : '4'); |
57 |
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puts("\t</DataDefinition>"); |
58 |
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} |
59 |
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60 |
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/* Output XML data prologue to stdout */ |
61 |
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static void |
62 |
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data_prologue() |
63 |
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{ |
64 |
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static const char *bsdf_type[4] = { |
65 |
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"Reflection Front", |
66 |
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"Transmission Front", |
67 |
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"Transmission Back", |
68 |
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"Reflection Back" |
69 |
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}; |
70 |
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71 |
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puts("\t<WavelengthData>"); |
72 |
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puts("\t\t<LayerNumber>System</LayerNumber>"); |
73 |
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puts("\t\t<Wavelength unit=\"Integral\">Visible</Wavelength>"); |
74 |
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puts("\t\t<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum>"); |
75 |
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puts("\t\t<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum>"); |
76 |
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puts("\t\t<WavelengthDataBlock>"); |
77 |
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printf("\t\t\t<WavelengthDataDirection>%s</WavelengthDataDirection>\n", |
78 |
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bsdf_type[(input_orient>0)<<1 | (output_orient>0)]); |
79 |
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puts("\t\t\t<AngleBasis>LBNL/Shirley-Chiu</AngleBasis>"); |
80 |
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puts("\t\t\t<ScatteringDataType>BTDF</ScatteringDataType>"); |
81 |
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puts("\t\t\t<ScatteringData>"); |
82 |
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} |
83 |
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84 |
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/* Output XML data epilogue to stdout */ |
85 |
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static void |
86 |
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data_epilogue(void) |
87 |
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{ |
88 |
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puts("\t\t\t</ScatteringData>"); |
89 |
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puts("\t\t</WavelengthDataBlock>"); |
90 |
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puts("\t</WavelengthData>"); |
91 |
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} |
92 |
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93 |
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/* Output XML epilogue to stdout */ |
94 |
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static void |
95 |
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xml_epilogue(void) |
96 |
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{ |
97 |
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puts("</Layer>"); |
98 |
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puts("</Optical>"); |
99 |
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puts("</WindowElement>"); |
100 |
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} |
101 |
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102 |
greg |
2.15 |
/* Compute absolute relative difference */ |
103 |
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static double |
104 |
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abs_diff(double v1, double v0) |
105 |
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{ |
106 |
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if ((v0 < 0) | (v1 < 0)) |
107 |
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return(.0); |
108 |
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v1 = (v1-v0)*2./(v0+v1+.0001); |
109 |
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if (v1 < 0) |
110 |
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return(-v1); |
111 |
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return(v1); |
112 |
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} |
113 |
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|
114 |
greg |
2.1 |
/* Interpolate and output isotropic BSDF data */ |
115 |
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static void |
116 |
greg |
2.11 |
eval_isotropic(char *funame) |
117 |
greg |
2.1 |
{ |
118 |
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const int sqres = 1<<samp_order; |
119 |
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FILE *ofp = NULL; |
120 |
greg |
2.17 |
int assignD = 0; |
121 |
greg |
2.1 |
char cmd[128]; |
122 |
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int ix, ox, oy; |
123 |
greg |
2.11 |
double iovec[6]; |
124 |
greg |
2.4 |
float bsdf; |
125 |
greg |
2.15 |
|
126 |
greg |
2.11 |
data_prologue(); /* begin output */ |
127 |
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if (pctcull >= 0) { |
128 |
greg |
2.20 |
sprintf(cmd, "rttree_reduce -a -h -ff -r 3 -t %f -g %d", |
129 |
greg |
2.1 |
pctcull, samp_order); |
130 |
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fflush(stdout); |
131 |
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ofp = popen(cmd, "w"); |
132 |
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if (ofp == NULL) { |
133 |
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fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n", |
134 |
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progname); |
135 |
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exit(1); |
136 |
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} |
137 |
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SET_FILE_BINARY(ofp); |
138 |
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} else |
139 |
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fputs("{\n", stdout); |
140 |
greg |
2.17 |
/* need to assign Dx, Dy, Dz? */ |
141 |
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if (funame != NULL) |
142 |
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assignD = (fundefined(funame) < 6); |
143 |
greg |
2.1 |
/* run through directions */ |
144 |
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for (ix = 0; ix < sqres/2; ix++) { |
145 |
greg |
2.11 |
RBFNODE *rbf = NULL; |
146 |
greg |
2.14 |
iovec[0] = 2.*(ix+.5)/sqres - 1.; |
147 |
greg |
2.11 |
iovec[1] = .0; |
148 |
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iovec[2] = input_orient * sqrt(1. - iovec[0]*iovec[0]); |
149 |
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if (funame == NULL) |
150 |
greg |
2.18 |
rbf = advect_rbf(iovec, lobe_lim); |
151 |
greg |
2.15 |
for (ox = 0; ox < sqres; ox++) { |
152 |
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float last_bsdf = -1; |
153 |
greg |
2.1 |
for (oy = 0; oy < sqres; oy++) { |
154 |
greg |
2.11 |
SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres); |
155 |
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iovec[5] = output_orient * |
156 |
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sqrt(1. - iovec[3]*iovec[3] - iovec[4]*iovec[4]); |
157 |
|
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if (funame == NULL) |
158 |
greg |
2.15 |
bsdf = eval_rbfrep(rbf, iovec+3) * |
159 |
greg |
2.11 |
output_orient/iovec[5]; |
160 |
greg |
2.15 |
else { |
161 |
greg |
2.16 |
double ssa[3], ssvec[6], sum; |
162 |
greg |
2.15 |
int ssi; |
163 |
greg |
2.17 |
if (assignD) { |
164 |
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varset("Dx", '=', -iovec[3]); |
165 |
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varset("Dy", '=', -iovec[4]); |
166 |
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varset("Dz", '=', -iovec[5]); |
167 |
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++eclock; |
168 |
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} |
169 |
greg |
2.15 |
bsdf = funvalue(funame, 6, iovec); |
170 |
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if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) { |
171 |
greg |
2.16 |
sum = 0; /* super-sample voxel */ |
172 |
greg |
2.15 |
for (ssi = nssamp; ssi--; ) { |
173 |
greg |
2.23 |
SDmultiSamp(ssa, 3, (ssi+frandom())/nssamp); |
174 |
greg |
2.15 |
ssvec[0] = 2.*(ix+ssa[0])/sqres - 1.; |
175 |
|
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ssvec[1] = .0; |
176 |
|
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ssvec[2] = input_orient * |
177 |
|
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sqrt(1. - ssvec[0]*ssvec[0]); |
178 |
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SDsquare2disk(ssvec+3, (ox+ssa[1])/sqres, |
179 |
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(oy+ssa[2])/sqres); |
180 |
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ssvec[5] = output_orient * |
181 |
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sqrt(1. - ssvec[3]*ssvec[3] - |
182 |
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ssvec[4]*ssvec[4]); |
183 |
greg |
2.17 |
if (assignD) { |
184 |
|
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varset("Dx", '=', -iovec[3]); |
185 |
|
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varset("Dy", '=', -iovec[4]); |
186 |
|
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varset("Dz", '=', -iovec[5]); |
187 |
|
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++eclock; |
188 |
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} |
189 |
greg |
2.16 |
sum += funvalue(funame, 6, ssvec); |
190 |
greg |
2.15 |
} |
191 |
greg |
2.16 |
bsdf = sum/nssamp; |
192 |
greg |
2.15 |
} |
193 |
|
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} |
194 |
greg |
2.1 |
if (pctcull >= 0) |
195 |
|
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fwrite(&bsdf, sizeof(bsdf), 1, ofp); |
196 |
|
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else |
197 |
|
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printf("\t%.3e\n", bsdf); |
198 |
greg |
2.15 |
last_bsdf = bsdf; |
199 |
greg |
2.1 |
} |
200 |
greg |
2.15 |
} |
201 |
greg |
2.3 |
if (rbf != NULL) |
202 |
|
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free(rbf); |
203 |
greg |
2.1 |
} |
204 |
|
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if (pctcull >= 0) { /* finish output */ |
205 |
|
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if (pclose(ofp)) { |
206 |
|
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fprintf(stderr, "%s: error running '%s'\n", |
207 |
|
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progname, cmd); |
208 |
|
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exit(1); |
209 |
|
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} |
210 |
|
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} else { |
211 |
|
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for (ix = sqres*sqres*sqres/2; ix--; ) |
212 |
|
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fputs("\t0\n", stdout); |
213 |
|
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fputs("}\n", stdout); |
214 |
|
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} |
215 |
greg |
2.11 |
data_epilogue(); |
216 |
greg |
2.1 |
} |
217 |
|
|
|
218 |
|
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/* Interpolate and output anisotropic BSDF data */ |
219 |
|
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static void |
220 |
greg |
2.11 |
eval_anisotropic(char *funame) |
221 |
greg |
2.1 |
{ |
222 |
|
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const int sqres = 1<<samp_order; |
223 |
|
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FILE *ofp = NULL; |
224 |
greg |
2.17 |
int assignD = 0; |
225 |
greg |
2.1 |
char cmd[128]; |
226 |
|
|
int ix, iy, ox, oy; |
227 |
greg |
2.11 |
double iovec[6]; |
228 |
greg |
2.4 |
float bsdf; |
229 |
greg |
2.15 |
|
230 |
greg |
2.11 |
data_prologue(); /* begin output */ |
231 |
|
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if (pctcull >= 0) { |
232 |
greg |
2.19 |
sprintf(cmd, "rttree_reduce%s -h -ff -r 4 -t %f -g %d", |
233 |
|
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(input_orient>0 ^ output_orient>0) ? "" : " -a", |
234 |
greg |
2.1 |
pctcull, samp_order); |
235 |
|
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fflush(stdout); |
236 |
|
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ofp = popen(cmd, "w"); |
237 |
|
|
if (ofp == NULL) { |
238 |
|
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fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n", |
239 |
|
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progname); |
240 |
|
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exit(1); |
241 |
|
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} |
242 |
|
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} else |
243 |
|
|
fputs("{\n", stdout); |
244 |
greg |
2.17 |
/* need to assign Dx, Dy, Dz? */ |
245 |
|
|
if (funame != NULL) |
246 |
|
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assignD = (fundefined(funame) < 6); |
247 |
greg |
2.1 |
/* run through directions */ |
248 |
|
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for (ix = 0; ix < sqres; ix++) |
249 |
|
|
for (iy = 0; iy < sqres; iy++) { |
250 |
greg |
2.11 |
RBFNODE *rbf = NULL; /* Klems reversal */ |
251 |
greg |
2.15 |
SDsquare2disk(iovec, 1.-(ix+.5)/sqres, 1.-(iy+.5)/sqres); |
252 |
greg |
2.11 |
iovec[2] = input_orient * |
253 |
|
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sqrt(1. - iovec[0]*iovec[0] - iovec[1]*iovec[1]); |
254 |
|
|
if (funame == NULL) |
255 |
greg |
2.18 |
rbf = advect_rbf(iovec, lobe_lim); |
256 |
greg |
2.15 |
for (ox = 0; ox < sqres; ox++) { |
257 |
|
|
float last_bsdf = -1; |
258 |
greg |
2.1 |
for (oy = 0; oy < sqres; oy++) { |
259 |
greg |
2.11 |
SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres); |
260 |
|
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iovec[5] = output_orient * |
261 |
|
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sqrt(1. - iovec[3]*iovec[3] - iovec[4]*iovec[4]); |
262 |
|
|
if (funame == NULL) |
263 |
greg |
2.15 |
bsdf = eval_rbfrep(rbf, iovec+3) * |
264 |
greg |
2.11 |
output_orient/iovec[5]; |
265 |
greg |
2.15 |
else { |
266 |
greg |
2.16 |
double ssa[4], ssvec[6], sum; |
267 |
greg |
2.15 |
int ssi; |
268 |
greg |
2.17 |
if (assignD) { |
269 |
|
|
varset("Dx", '=', -iovec[3]); |
270 |
|
|
varset("Dy", '=', -iovec[4]); |
271 |
|
|
varset("Dz", '=', -iovec[5]); |
272 |
|
|
++eclock; |
273 |
|
|
} |
274 |
greg |
2.15 |
bsdf = funvalue(funame, 6, iovec); |
275 |
|
|
if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) { |
276 |
greg |
2.16 |
sum = 0; /* super-sample voxel */ |
277 |
greg |
2.15 |
for (ssi = nssamp; ssi--; ) { |
278 |
greg |
2.23 |
SDmultiSamp(ssa, 4, (ssi+frandom())/nssamp); |
279 |
greg |
2.15 |
SDsquare2disk(ssvec, 1.-(ix+ssa[0])/sqres, |
280 |
|
|
1.-(iy+ssa[1])/sqres); |
281 |
|
|
ssvec[2] = output_orient * |
282 |
|
|
sqrt(1. - ssvec[0]*ssvec[0] - |
283 |
|
|
ssvec[1]*ssvec[1]); |
284 |
|
|
SDsquare2disk(ssvec+3, (ox+ssa[2])/sqres, |
285 |
|
|
(oy+ssa[3])/sqres); |
286 |
|
|
ssvec[5] = output_orient * |
287 |
|
|
sqrt(1. - ssvec[3]*ssvec[3] - |
288 |
|
|
ssvec[4]*ssvec[4]); |
289 |
greg |
2.17 |
if (assignD) { |
290 |
|
|
varset("Dx", '=', -iovec[3]); |
291 |
|
|
varset("Dy", '=', -iovec[4]); |
292 |
|
|
varset("Dz", '=', -iovec[5]); |
293 |
|
|
++eclock; |
294 |
|
|
} |
295 |
greg |
2.16 |
sum += funvalue(funame, 6, ssvec); |
296 |
greg |
2.15 |
} |
297 |
greg |
2.16 |
bsdf = sum/nssamp; |
298 |
greg |
2.15 |
} |
299 |
|
|
} |
300 |
greg |
2.1 |
if (pctcull >= 0) |
301 |
|
|
fwrite(&bsdf, sizeof(bsdf), 1, ofp); |
302 |
|
|
else |
303 |
|
|
printf("\t%.3e\n", bsdf); |
304 |
greg |
2.15 |
last_bsdf = bsdf; |
305 |
greg |
2.1 |
} |
306 |
greg |
2.15 |
} |
307 |
greg |
2.3 |
if (rbf != NULL) |
308 |
|
|
free(rbf); |
309 |
greg |
2.1 |
} |
310 |
|
|
if (pctcull >= 0) { /* finish output */ |
311 |
|
|
if (pclose(ofp)) { |
312 |
|
|
fprintf(stderr, "%s: error running '%s'\n", |
313 |
|
|
progname, cmd); |
314 |
|
|
exit(1); |
315 |
|
|
} |
316 |
|
|
} else |
317 |
|
|
fputs("}\n", stdout); |
318 |
greg |
2.11 |
data_epilogue(); |
319 |
greg |
2.5 |
} |
320 |
|
|
|
321 |
greg |
2.1 |
/* Read in BSDF and interpolate as tensor tree representation */ |
322 |
|
|
int |
323 |
|
|
main(int argc, char *argv[]) |
324 |
|
|
{ |
325 |
greg |
2.11 |
int dofwd = 0, dobwd = 1; |
326 |
|
|
int i, na; |
327 |
greg |
2.1 |
|
328 |
greg |
2.5 |
progname = argv[0]; |
329 |
greg |
2.11 |
esupport |= E_VARIABLE|E_FUNCTION|E_RCONST; |
330 |
|
|
esupport &= ~(E_INCHAN|E_OUTCHAN); |
331 |
|
|
scompile("PI:3.14159265358979323846", NULL, 0); |
332 |
|
|
biggerlib(); |
333 |
|
|
for (i = 1; i < argc-1 && (argv[i][0] == '-') | (argv[i][0] == '+'); i++) |
334 |
|
|
switch (argv[i][1]) { /* get options */ |
335 |
|
|
case 'e': |
336 |
|
|
scompile(argv[++i], NULL, 0); |
337 |
|
|
break; |
338 |
|
|
case 'f': |
339 |
|
|
if (!argv[i][2]) |
340 |
|
|
fcompile(argv[++i]); |
341 |
|
|
else |
342 |
|
|
dofwd = (argv[i][0] == '+'); |
343 |
|
|
break; |
344 |
|
|
case 'b': |
345 |
|
|
dobwd = (argv[i][0] == '+'); |
346 |
|
|
break; |
347 |
greg |
2.1 |
case 't': |
348 |
greg |
2.11 |
switch (argv[i][2]) { |
349 |
|
|
case '3': |
350 |
greg |
2.13 |
single_plane_incident = 1; |
351 |
greg |
2.11 |
break; |
352 |
|
|
case '4': |
353 |
greg |
2.13 |
single_plane_incident = 0; |
354 |
greg |
2.11 |
break; |
355 |
|
|
case '\0': |
356 |
|
|
pctcull = atof(argv[++i]); |
357 |
|
|
break; |
358 |
|
|
default: |
359 |
|
|
goto userr; |
360 |
|
|
} |
361 |
greg |
2.1 |
break; |
362 |
|
|
case 'g': |
363 |
greg |
2.5 |
samp_order = atoi(argv[++i]); |
364 |
greg |
2.1 |
break; |
365 |
greg |
2.18 |
case 'l': |
366 |
|
|
lobe_lim = atoi(argv[++i]); |
367 |
|
|
break; |
368 |
greg |
2.1 |
default: |
369 |
|
|
goto userr; |
370 |
|
|
} |
371 |
greg |
2.11 |
if (single_plane_incident >= 0) { /* function-based BSDF? */ |
372 |
|
|
void (*evf)(char *s) = single_plane_incident ? |
373 |
|
|
&eval_isotropic : &eval_anisotropic; |
374 |
greg |
2.17 |
if (i != argc-1 || fundefined(argv[i]) < 3) { |
375 |
greg |
2.12 |
fprintf(stderr, |
376 |
|
|
"%s: need single function with 6 arguments: bsdf(ix,iy,iz,ox,oy,oz)\n", |
377 |
|
|
progname); |
378 |
greg |
2.24 |
fprintf(stderr, "\tor 3 arguments using Dx,Dy,Dz: bsdf(ix,iy,iz)\n"); |
379 |
greg |
2.11 |
goto userr; |
380 |
greg |
2.12 |
} |
381 |
greg |
2.17 |
++eclock; |
382 |
greg |
2.11 |
xml_prologue(argc, argv); /* start XML output */ |
383 |
|
|
if (dofwd) { |
384 |
|
|
input_orient = -1; |
385 |
|
|
output_orient = -1; |
386 |
|
|
(*evf)(argv[i]); /* outside reflectance */ |
387 |
|
|
output_orient = 1; |
388 |
|
|
(*evf)(argv[i]); /* outside -> inside */ |
389 |
|
|
} |
390 |
|
|
if (dobwd) { |
391 |
|
|
input_orient = 1; |
392 |
|
|
output_orient = 1; |
393 |
|
|
(*evf)(argv[i]); /* inside reflectance */ |
394 |
|
|
output_orient = -1; |
395 |
|
|
(*evf)(argv[i]); /* inside -> outside */ |
396 |
|
|
} |
397 |
|
|
xml_epilogue(); /* finish XML output & exit */ |
398 |
|
|
return(0); |
399 |
|
|
} |
400 |
|
|
if (i < argc) { /* open input files if given */ |
401 |
greg |
2.12 |
int nbsdf = 0; |
402 |
greg |
2.11 |
for ( ; i < argc; i++) { /* interpolate each component */ |
403 |
|
|
FILE *fpin = fopen(argv[i], "rb"); |
404 |
|
|
if (fpin == NULL) { |
405 |
|
|
fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n", |
406 |
|
|
progname, argv[i]); |
407 |
|
|
return(1); |
408 |
|
|
} |
409 |
|
|
if (!load_bsdf_rep(fpin)) |
410 |
|
|
return(1); |
411 |
|
|
fclose(fpin); |
412 |
greg |
2.12 |
if (!nbsdf++) /* start XML on first dist. */ |
413 |
|
|
xml_prologue(argc, argv); |
414 |
greg |
2.11 |
if (single_plane_incident) |
415 |
|
|
eval_isotropic(NULL); |
416 |
|
|
else |
417 |
|
|
eval_anisotropic(NULL); |
418 |
|
|
} |
419 |
|
|
xml_epilogue(); /* finish XML output & exit */ |
420 |
|
|
return(0); |
421 |
|
|
} |
422 |
|
|
SET_FILE_BINARY(stdin); /* load from stdin */ |
423 |
|
|
if (!load_bsdf_rep(stdin)) |
424 |
greg |
2.1 |
return(1); |
425 |
greg |
2.5 |
xml_prologue(argc, argv); /* start XML output */ |
426 |
greg |
2.1 |
if (single_plane_incident) /* resample dist. */ |
427 |
greg |
2.11 |
eval_isotropic(NULL); |
428 |
greg |
2.1 |
else |
429 |
greg |
2.11 |
eval_anisotropic(NULL); |
430 |
|
|
xml_epilogue(); /* finish XML output & exit */ |
431 |
greg |
2.1 |
return(0); |
432 |
|
|
userr: |
433 |
|
|
fprintf(stderr, |
434 |
greg |
2.18 |
"Usage: %s [-g Nlog2][-t pctcull][-l maxlobes] [bsdf.sir ..] > bsdf.xml\n", |
435 |
greg |
2.11 |
progname); |
436 |
|
|
fprintf(stderr, |
437 |
|
|
" or: %s -t{3|4} [-g Nlog2][-t pctcull][{+|-}for[ward]][{+|-}b[ackward]][-e expr][-f file] bsdf_func > bsdf.xml\n", |
438 |
greg |
2.1 |
progname); |
439 |
|
|
return(1); |
440 |
|
|
} |