1 |
greg |
2.1 |
#ifndef lint |
2 |
greg |
2.16 |
static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.15 2013/05/15 03:22:31 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 |
|
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#include "platform.h" |
15 |
greg |
2.11 |
#include "calcomp.h" |
16 |
greg |
2.1 |
#include "bsdfrep.h" |
17 |
|
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/* global argv[0] */ |
18 |
|
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char *progname; |
19 |
|
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/* percentage to cull (<0 to turn off) */ |
20 |
greg |
2.7 |
double pctcull = 90.; |
21 |
greg |
2.1 |
/* sampling order */ |
22 |
|
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int samp_order = 6; |
23 |
greg |
2.15 |
/* super-sampling threshold */ |
24 |
|
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const double ssamp_thresh = 0.35; |
25 |
|
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/* number of super-samples */ |
26 |
|
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const int nssamp = 100; |
27 |
greg |
2.1 |
|
28 |
greg |
2.11 |
/* Output XML prologue to stdout */ |
29 |
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static void |
30 |
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xml_prologue(int ac, char *av[]) |
31 |
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{ |
32 |
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puts("<?xml version=\"1.0\" encoding=\"UTF-8\"?>"); |
33 |
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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\">"); |
34 |
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fputs("<!-- File produced by:", stdout); |
35 |
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while (ac-- > 0) { |
36 |
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fputc(' ', stdout); |
37 |
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fputs(*av++, stdout); |
38 |
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} |
39 |
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puts(" -->"); |
40 |
|
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puts("<WindowElementType>System</WindowElementType>"); |
41 |
|
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puts("<FileType>BSDF</FileType>"); |
42 |
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puts("<Optical>"); |
43 |
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puts("<Layer>"); |
44 |
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puts("\t<Material>"); |
45 |
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puts("\t\t<Name>Name</Name>"); |
46 |
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puts("\t\t<Manufacturer>Manufacturer</Manufacturer>"); |
47 |
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puts("\t\t<DeviceType>Other</DeviceType>"); |
48 |
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puts("\t</Material>"); |
49 |
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puts("\t<DataDefinition>"); |
50 |
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printf("\t\t<IncidentDataStructure>TensorTree%c</IncidentDataStructure>\n", |
51 |
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single_plane_incident ? '3' : '4'); |
52 |
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puts("\t</DataDefinition>"); |
53 |
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} |
54 |
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|
55 |
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/* Output XML data prologue to stdout */ |
56 |
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static void |
57 |
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data_prologue() |
58 |
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{ |
59 |
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static const char *bsdf_type[4] = { |
60 |
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"Reflection Front", |
61 |
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"Transmission Front", |
62 |
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"Transmission Back", |
63 |
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"Reflection Back" |
64 |
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}; |
65 |
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|
66 |
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puts("\t<WavelengthData>"); |
67 |
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puts("\t\t<LayerNumber>System</LayerNumber>"); |
68 |
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puts("\t\t<Wavelength unit=\"Integral\">Visible</Wavelength>"); |
69 |
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puts("\t\t<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum>"); |
70 |
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puts("\t\t<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum>"); |
71 |
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puts("\t\t<WavelengthDataBlock>"); |
72 |
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printf("\t\t\t<WavelengthDataDirection>%s</WavelengthDataDirection>\n", |
73 |
|
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bsdf_type[(input_orient>0)<<1 | (output_orient>0)]); |
74 |
|
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puts("\t\t\t<AngleBasis>LBNL/Shirley-Chiu</AngleBasis>"); |
75 |
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puts("\t\t\t<ScatteringDataType>BTDF</ScatteringDataType>"); |
76 |
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puts("\t\t\t<ScatteringData>"); |
77 |
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} |
78 |
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|
79 |
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/* Output XML data epilogue to stdout */ |
80 |
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static void |
81 |
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data_epilogue(void) |
82 |
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{ |
83 |
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puts("\t\t\t</ScatteringData>"); |
84 |
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puts("\t\t</WavelengthDataBlock>"); |
85 |
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puts("\t</WavelengthData>"); |
86 |
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} |
87 |
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|
88 |
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/* Output XML epilogue to stdout */ |
89 |
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static void |
90 |
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xml_epilogue(void) |
91 |
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{ |
92 |
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puts("</Layer>"); |
93 |
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puts("</Optical>"); |
94 |
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puts("</WindowElement>"); |
95 |
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} |
96 |
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|
97 |
greg |
2.15 |
/* Compute absolute relative difference */ |
98 |
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static double |
99 |
|
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abs_diff(double v1, double v0) |
100 |
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{ |
101 |
|
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if ((v0 < 0) | (v1 < 0)) |
102 |
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return(.0); |
103 |
|
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v1 = (v1-v0)*2./(v0+v1+.0001); |
104 |
|
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if (v1 < 0) |
105 |
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return(-v1); |
106 |
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return(v1); |
107 |
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} |
108 |
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|
109 |
greg |
2.1 |
/* Interpolate and output isotropic BSDF data */ |
110 |
|
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static void |
111 |
greg |
2.11 |
eval_isotropic(char *funame) |
112 |
greg |
2.1 |
{ |
113 |
|
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const int sqres = 1<<samp_order; |
114 |
|
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FILE *ofp = NULL; |
115 |
|
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char cmd[128]; |
116 |
|
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int ix, ox, oy; |
117 |
greg |
2.11 |
double iovec[6]; |
118 |
greg |
2.4 |
float bsdf; |
119 |
greg |
2.15 |
|
120 |
greg |
2.11 |
data_prologue(); /* begin output */ |
121 |
|
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if (pctcull >= 0) { |
122 |
greg |
2.7 |
sprintf(cmd, "rttree_reduce -h -a -ff -r 3 -t %f -g %d", |
123 |
greg |
2.1 |
pctcull, samp_order); |
124 |
|
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fflush(stdout); |
125 |
|
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ofp = popen(cmd, "w"); |
126 |
|
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if (ofp == NULL) { |
127 |
|
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fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n", |
128 |
|
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progname); |
129 |
|
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exit(1); |
130 |
|
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} |
131 |
|
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SET_FILE_BINARY(ofp); |
132 |
|
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} else |
133 |
|
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fputs("{\n", stdout); |
134 |
|
|
/* run through directions */ |
135 |
|
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for (ix = 0; ix < sqres/2; ix++) { |
136 |
greg |
2.11 |
RBFNODE *rbf = NULL; |
137 |
greg |
2.14 |
iovec[0] = 2.*(ix+.5)/sqres - 1.; |
138 |
greg |
2.11 |
iovec[1] = .0; |
139 |
|
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iovec[2] = input_orient * sqrt(1. - iovec[0]*iovec[0]); |
140 |
|
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if (funame == NULL) |
141 |
|
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rbf = advect_rbf(iovec); |
142 |
greg |
2.15 |
for (ox = 0; ox < sqres; ox++) { |
143 |
|
|
float last_bsdf = -1; |
144 |
greg |
2.1 |
for (oy = 0; oy < sqres; oy++) { |
145 |
greg |
2.11 |
SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres); |
146 |
|
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iovec[5] = output_orient * |
147 |
|
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sqrt(1. - iovec[3]*iovec[3] - iovec[4]*iovec[4]); |
148 |
|
|
if (funame == NULL) |
149 |
greg |
2.15 |
bsdf = eval_rbfrep(rbf, iovec+3) * |
150 |
greg |
2.11 |
output_orient/iovec[5]; |
151 |
greg |
2.15 |
else { |
152 |
greg |
2.16 |
double ssa[3], ssvec[6], sum; |
153 |
greg |
2.15 |
int ssi; |
154 |
|
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bsdf = funvalue(funame, 6, iovec); |
155 |
|
|
if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) { |
156 |
greg |
2.16 |
sum = 0; /* super-sample voxel */ |
157 |
greg |
2.15 |
for (ssi = nssamp; ssi--; ) { |
158 |
|
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SDmultiSamp(ssa, 3, (ssi+drand48())/nssamp); |
159 |
|
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ssvec[0] = 2.*(ix+ssa[0])/sqres - 1.; |
160 |
|
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ssvec[1] = .0; |
161 |
|
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ssvec[2] = input_orient * |
162 |
|
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sqrt(1. - ssvec[0]*ssvec[0]); |
163 |
|
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SDsquare2disk(ssvec+3, (ox+ssa[1])/sqres, |
164 |
|
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(oy+ssa[2])/sqres); |
165 |
|
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ssvec[5] = output_orient * |
166 |
|
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sqrt(1. - ssvec[3]*ssvec[3] - |
167 |
|
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ssvec[4]*ssvec[4]); |
168 |
greg |
2.16 |
sum += funvalue(funame, 6, ssvec); |
169 |
greg |
2.15 |
} |
170 |
greg |
2.16 |
bsdf = sum/nssamp; |
171 |
greg |
2.15 |
} |
172 |
|
|
} |
173 |
greg |
2.1 |
if (pctcull >= 0) |
174 |
|
|
fwrite(&bsdf, sizeof(bsdf), 1, ofp); |
175 |
|
|
else |
176 |
|
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printf("\t%.3e\n", bsdf); |
177 |
greg |
2.15 |
last_bsdf = bsdf; |
178 |
greg |
2.1 |
} |
179 |
greg |
2.15 |
} |
180 |
greg |
2.3 |
if (rbf != NULL) |
181 |
|
|
free(rbf); |
182 |
greg |
2.1 |
} |
183 |
|
|
if (pctcull >= 0) { /* finish output */ |
184 |
|
|
if (pclose(ofp)) { |
185 |
|
|
fprintf(stderr, "%s: error running '%s'\n", |
186 |
|
|
progname, cmd); |
187 |
|
|
exit(1); |
188 |
|
|
} |
189 |
|
|
} else { |
190 |
|
|
for (ix = sqres*sqres*sqres/2; ix--; ) |
191 |
|
|
fputs("\t0\n", stdout); |
192 |
|
|
fputs("}\n", stdout); |
193 |
|
|
} |
194 |
greg |
2.11 |
data_epilogue(); |
195 |
greg |
2.1 |
} |
196 |
|
|
|
197 |
|
|
/* Interpolate and output anisotropic BSDF data */ |
198 |
|
|
static void |
199 |
greg |
2.11 |
eval_anisotropic(char *funame) |
200 |
greg |
2.1 |
{ |
201 |
|
|
const int sqres = 1<<samp_order; |
202 |
|
|
FILE *ofp = NULL; |
203 |
|
|
char cmd[128]; |
204 |
|
|
int ix, iy, ox, oy; |
205 |
greg |
2.11 |
double iovec[6]; |
206 |
greg |
2.4 |
float bsdf; |
207 |
greg |
2.15 |
|
208 |
greg |
2.11 |
data_prologue(); /* begin output */ |
209 |
|
|
if (pctcull >= 0) { |
210 |
greg |
2.7 |
sprintf(cmd, "rttree_reduce -h -a -ff -r 4 -t %f -g %d", |
211 |
greg |
2.1 |
pctcull, samp_order); |
212 |
|
|
fflush(stdout); |
213 |
|
|
ofp = popen(cmd, "w"); |
214 |
|
|
if (ofp == NULL) { |
215 |
|
|
fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n", |
216 |
|
|
progname); |
217 |
|
|
exit(1); |
218 |
|
|
} |
219 |
|
|
} else |
220 |
|
|
fputs("{\n", stdout); |
221 |
|
|
/* run through directions */ |
222 |
|
|
for (ix = 0; ix < sqres; ix++) |
223 |
|
|
for (iy = 0; iy < sqres; iy++) { |
224 |
greg |
2.11 |
RBFNODE *rbf = NULL; /* Klems reversal */ |
225 |
greg |
2.15 |
SDsquare2disk(iovec, 1.-(ix+.5)/sqres, 1.-(iy+.5)/sqres); |
226 |
greg |
2.11 |
iovec[2] = input_orient * |
227 |
|
|
sqrt(1. - iovec[0]*iovec[0] - iovec[1]*iovec[1]); |
228 |
|
|
if (funame == NULL) |
229 |
|
|
rbf = advect_rbf(iovec); |
230 |
greg |
2.15 |
for (ox = 0; ox < sqres; ox++) { |
231 |
|
|
float last_bsdf = -1; |
232 |
greg |
2.1 |
for (oy = 0; oy < sqres; oy++) { |
233 |
greg |
2.11 |
SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres); |
234 |
|
|
iovec[5] = output_orient * |
235 |
|
|
sqrt(1. - iovec[3]*iovec[3] - iovec[4]*iovec[4]); |
236 |
|
|
if (funame == NULL) |
237 |
greg |
2.15 |
bsdf = eval_rbfrep(rbf, iovec+3) * |
238 |
greg |
2.11 |
output_orient/iovec[5]; |
239 |
greg |
2.15 |
else { |
240 |
greg |
2.16 |
double ssa[4], ssvec[6], sum; |
241 |
greg |
2.15 |
int ssi; |
242 |
|
|
bsdf = funvalue(funame, 6, iovec); |
243 |
|
|
if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) { |
244 |
greg |
2.16 |
sum = 0; /* super-sample voxel */ |
245 |
greg |
2.15 |
for (ssi = nssamp; ssi--; ) { |
246 |
|
|
SDmultiSamp(ssa, 4, (ssi+drand48())/nssamp); |
247 |
|
|
SDsquare2disk(ssvec, 1.-(ix+ssa[0])/sqres, |
248 |
|
|
1.-(iy+ssa[1])/sqres); |
249 |
|
|
ssvec[2] = output_orient * |
250 |
|
|
sqrt(1. - ssvec[0]*ssvec[0] - |
251 |
|
|
ssvec[1]*ssvec[1]); |
252 |
|
|
SDsquare2disk(ssvec+3, (ox+ssa[2])/sqres, |
253 |
|
|
(oy+ssa[3])/sqres); |
254 |
|
|
ssvec[5] = output_orient * |
255 |
|
|
sqrt(1. - ssvec[3]*ssvec[3] - |
256 |
|
|
ssvec[4]*ssvec[4]); |
257 |
greg |
2.16 |
sum += funvalue(funame, 6, ssvec); |
258 |
greg |
2.15 |
} |
259 |
greg |
2.16 |
bsdf = sum/nssamp; |
260 |
greg |
2.15 |
} |
261 |
|
|
} |
262 |
greg |
2.1 |
if (pctcull >= 0) |
263 |
|
|
fwrite(&bsdf, sizeof(bsdf), 1, ofp); |
264 |
|
|
else |
265 |
|
|
printf("\t%.3e\n", bsdf); |
266 |
greg |
2.15 |
last_bsdf = bsdf; |
267 |
greg |
2.1 |
} |
268 |
greg |
2.15 |
} |
269 |
greg |
2.3 |
if (rbf != NULL) |
270 |
|
|
free(rbf); |
271 |
greg |
2.1 |
} |
272 |
|
|
if (pctcull >= 0) { /* finish output */ |
273 |
|
|
if (pclose(ofp)) { |
274 |
|
|
fprintf(stderr, "%s: error running '%s'\n", |
275 |
|
|
progname, cmd); |
276 |
|
|
exit(1); |
277 |
|
|
} |
278 |
|
|
} else |
279 |
|
|
fputs("}\n", stdout); |
280 |
greg |
2.11 |
data_epilogue(); |
281 |
greg |
2.5 |
} |
282 |
|
|
|
283 |
greg |
2.1 |
/* Read in BSDF and interpolate as tensor tree representation */ |
284 |
|
|
int |
285 |
|
|
main(int argc, char *argv[]) |
286 |
|
|
{ |
287 |
greg |
2.11 |
int dofwd = 0, dobwd = 1; |
288 |
|
|
int i, na; |
289 |
greg |
2.1 |
|
290 |
greg |
2.5 |
progname = argv[0]; |
291 |
greg |
2.11 |
esupport |= E_VARIABLE|E_FUNCTION|E_RCONST; |
292 |
|
|
esupport &= ~(E_INCHAN|E_OUTCHAN); |
293 |
|
|
scompile("PI:3.14159265358979323846", NULL, 0); |
294 |
|
|
biggerlib(); |
295 |
|
|
for (i = 1; i < argc-1 && (argv[i][0] == '-') | (argv[i][0] == '+'); i++) |
296 |
|
|
switch (argv[i][1]) { /* get options */ |
297 |
|
|
case 'e': |
298 |
|
|
scompile(argv[++i], NULL, 0); |
299 |
|
|
break; |
300 |
|
|
case 'f': |
301 |
|
|
if (!argv[i][2]) |
302 |
|
|
fcompile(argv[++i]); |
303 |
|
|
else |
304 |
|
|
dofwd = (argv[i][0] == '+'); |
305 |
|
|
break; |
306 |
|
|
case 'b': |
307 |
|
|
dobwd = (argv[i][0] == '+'); |
308 |
|
|
break; |
309 |
greg |
2.1 |
case 't': |
310 |
greg |
2.11 |
switch (argv[i][2]) { |
311 |
|
|
case '3': |
312 |
greg |
2.13 |
single_plane_incident = 1; |
313 |
greg |
2.11 |
break; |
314 |
|
|
case '4': |
315 |
greg |
2.13 |
single_plane_incident = 0; |
316 |
greg |
2.11 |
break; |
317 |
|
|
case '\0': |
318 |
|
|
pctcull = atof(argv[++i]); |
319 |
|
|
break; |
320 |
|
|
default: |
321 |
|
|
goto userr; |
322 |
|
|
} |
323 |
greg |
2.1 |
break; |
324 |
|
|
case 'g': |
325 |
greg |
2.5 |
samp_order = atoi(argv[++i]); |
326 |
greg |
2.1 |
break; |
327 |
|
|
default: |
328 |
|
|
goto userr; |
329 |
|
|
} |
330 |
greg |
2.11 |
if (single_plane_incident >= 0) { /* function-based BSDF? */ |
331 |
|
|
void (*evf)(char *s) = single_plane_incident ? |
332 |
|
|
&eval_isotropic : &eval_anisotropic; |
333 |
greg |
2.12 |
if (i != argc-1 || fundefined(argv[i]) != 6) { |
334 |
|
|
fprintf(stderr, |
335 |
|
|
"%s: need single function with 6 arguments: bsdf(ix,iy,iz,ox,oy,oz)\n", |
336 |
|
|
progname); |
337 |
greg |
2.11 |
goto userr; |
338 |
greg |
2.12 |
} |
339 |
greg |
2.11 |
xml_prologue(argc, argv); /* start XML output */ |
340 |
|
|
if (dofwd) { |
341 |
|
|
input_orient = -1; |
342 |
|
|
output_orient = -1; |
343 |
|
|
(*evf)(argv[i]); /* outside reflectance */ |
344 |
|
|
output_orient = 1; |
345 |
|
|
(*evf)(argv[i]); /* outside -> inside */ |
346 |
|
|
} |
347 |
|
|
if (dobwd) { |
348 |
|
|
input_orient = 1; |
349 |
|
|
output_orient = 1; |
350 |
|
|
(*evf)(argv[i]); /* inside reflectance */ |
351 |
|
|
output_orient = -1; |
352 |
|
|
(*evf)(argv[i]); /* inside -> outside */ |
353 |
|
|
} |
354 |
|
|
xml_epilogue(); /* finish XML output & exit */ |
355 |
|
|
return(0); |
356 |
|
|
} |
357 |
|
|
if (i < argc) { /* open input files if given */ |
358 |
greg |
2.12 |
int nbsdf = 0; |
359 |
greg |
2.11 |
for ( ; i < argc; i++) { /* interpolate each component */ |
360 |
|
|
FILE *fpin = fopen(argv[i], "rb"); |
361 |
|
|
if (fpin == NULL) { |
362 |
|
|
fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n", |
363 |
|
|
progname, argv[i]); |
364 |
|
|
return(1); |
365 |
|
|
} |
366 |
|
|
if (!load_bsdf_rep(fpin)) |
367 |
|
|
return(1); |
368 |
|
|
fclose(fpin); |
369 |
greg |
2.12 |
if (!nbsdf++) /* start XML on first dist. */ |
370 |
|
|
xml_prologue(argc, argv); |
371 |
greg |
2.11 |
if (single_plane_incident) |
372 |
|
|
eval_isotropic(NULL); |
373 |
|
|
else |
374 |
|
|
eval_anisotropic(NULL); |
375 |
|
|
} |
376 |
|
|
xml_epilogue(); /* finish XML output & exit */ |
377 |
|
|
return(0); |
378 |
|
|
} |
379 |
|
|
SET_FILE_BINARY(stdin); /* load from stdin */ |
380 |
|
|
if (!load_bsdf_rep(stdin)) |
381 |
greg |
2.1 |
return(1); |
382 |
greg |
2.5 |
xml_prologue(argc, argv); /* start XML output */ |
383 |
greg |
2.1 |
if (single_plane_incident) /* resample dist. */ |
384 |
greg |
2.11 |
eval_isotropic(NULL); |
385 |
greg |
2.1 |
else |
386 |
greg |
2.11 |
eval_anisotropic(NULL); |
387 |
|
|
xml_epilogue(); /* finish XML output & exit */ |
388 |
greg |
2.1 |
return(0); |
389 |
|
|
userr: |
390 |
|
|
fprintf(stderr, |
391 |
greg |
2.11 |
"Usage: %s [-g Nlog2][-t pctcull] [bsdf.sir ..] > bsdf.xml\n", |
392 |
|
|
progname); |
393 |
|
|
fprintf(stderr, |
394 |
|
|
" or: %s -t{3|4} [-g Nlog2][-t pctcull][{+|-}for[ward]][{+|-}b[ackward]][-e expr][-f file] bsdf_func > bsdf.xml\n", |
395 |
greg |
2.1 |
progname); |
396 |
|
|
return(1); |
397 |
|
|
} |