1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: pabopto2bsdf.c,v 2.14 2014/02/20 09:21:32 greg Exp $"; |
3 |
#endif |
4 |
/* |
5 |
* Load measured BSDF data in PAB-Opto format. |
6 |
* |
7 |
* G. Ward |
8 |
*/ |
9 |
|
10 |
#include <stdio.h> |
11 |
#include <stdlib.h> |
12 |
#include <string.h> |
13 |
#include <ctype.h> |
14 |
#include <math.h> |
15 |
#include "platform.h" |
16 |
#include "bsdfrep.h" |
17 |
#include "resolu.h" |
18 |
/* global argv[0] */ |
19 |
char *progname; |
20 |
|
21 |
typedef struct { |
22 |
const char *fname; /* input file path */ |
23 |
double theta, phi; /* incident angles (in degrees) */ |
24 |
int isDSF; /* data is DSF (rather than BSDF)? */ |
25 |
long dstart; /* data start offset in file */ |
26 |
} PGINPUT; |
27 |
|
28 |
PGINPUT *inpfile; /* input files sorted by incidence */ |
29 |
int ninpfiles; /* number of input files */ |
30 |
|
31 |
/* Compare incident angles */ |
32 |
static int |
33 |
cmp_inang(const void *p1, const void *p2) |
34 |
{ |
35 |
const PGINPUT *inp1 = (const PGINPUT *)p1; |
36 |
const PGINPUT *inp2 = (const PGINPUT *)p2; |
37 |
|
38 |
if (inp1->theta > inp2->theta+FTINY) |
39 |
return(1); |
40 |
if (inp1->theta < inp2->theta-FTINY) |
41 |
return(-1); |
42 |
if (inp1->phi > inp2->phi+FTINY) |
43 |
return(1); |
44 |
if (inp1->phi < inp2->phi-FTINY) |
45 |
return(-1); |
46 |
return(0); |
47 |
} |
48 |
|
49 |
/* Prepare a PAB-Opto input file by reading its header */ |
50 |
static int |
51 |
init_pabopto_inp(const int i, const char *fname) |
52 |
{ |
53 |
FILE *fp = fopen(fname, "r"); |
54 |
char buf[2048]; |
55 |
int c; |
56 |
|
57 |
if (fp == NULL) { |
58 |
fputs(fname, stderr); |
59 |
fputs(": cannot open\n", stderr); |
60 |
return(0); |
61 |
} |
62 |
inpfile[i].fname = fname; |
63 |
inpfile[i].isDSF = -1; |
64 |
inpfile[i].theta = inpfile[i].phi = -10001.; |
65 |
/* read header information */ |
66 |
while ((c = getc(fp)) == '#' || c == EOF) { |
67 |
char typ[32]; |
68 |
if (fgets(buf, sizeof(buf), fp) == NULL) { |
69 |
fputs(fname, stderr); |
70 |
fputs(": unexpected EOF\n", stderr); |
71 |
fclose(fp); |
72 |
return(0); |
73 |
} |
74 |
if (sscanf(buf, "sample_name \"%[^\"]\"", bsdf_name) == 1) |
75 |
continue; |
76 |
if (sscanf(buf, "format: theta phi %s", typ) == 1) { |
77 |
if (!strcasecmp(typ, "DSF")) { |
78 |
inpfile[i].isDSF = 1; |
79 |
continue; |
80 |
} |
81 |
if (!strcasecmp(typ, "BSDF")) { |
82 |
inpfile[i].isDSF = 0; |
83 |
continue; |
84 |
} |
85 |
} |
86 |
if (sscanf(buf, "intheta %lf", &inpfile[i].theta) == 1) |
87 |
continue; |
88 |
if (sscanf(buf, "inphi %lf", &inpfile[i].phi) == 1) |
89 |
continue; |
90 |
if (sscanf(buf, "incident_angle %lf %lf", |
91 |
&inpfile[i].theta, &inpfile[i].phi) == 2) |
92 |
continue; |
93 |
} |
94 |
inpfile[i].dstart = ftell(fp) - 1; |
95 |
fclose(fp); |
96 |
if (inpfile[i].isDSF < 0) { |
97 |
fputs(fname, stderr); |
98 |
fputs(": unknown format\n", stderr); |
99 |
return(0); |
100 |
} |
101 |
if ((inpfile[i].theta < -10000.) | (inpfile[i].phi < -10000.)) { |
102 |
fputs(fname, stderr); |
103 |
fputs(": unknown incident angle\n", stderr); |
104 |
return(0); |
105 |
} |
106 |
while (inpfile[i].phi < 0) /* normalize phi direction */ |
107 |
inpfile[i].phi += 360.; |
108 |
return(1); |
109 |
} |
110 |
|
111 |
/* Load a set of measurements corresponding to a particular incident angle */ |
112 |
static int |
113 |
add_pabopto_inp(const int i) |
114 |
{ |
115 |
FILE *fp = fopen(inpfile[i].fname, "r"); |
116 |
double theta_out, phi_out, val; |
117 |
int n, c; |
118 |
|
119 |
if (fp == NULL || fseek(fp, inpfile[i].dstart, 0) == EOF) { |
120 |
fputs(inpfile[i].fname, stderr); |
121 |
fputs(": cannot open\n", stderr); |
122 |
return(0); |
123 |
} |
124 |
/* prepare input grid */ |
125 |
if (!i || cmp_inang(&inpfile[i-1], &inpfile[i])) { |
126 |
if (i) /* need to process previous incidence */ |
127 |
make_rbfrep(); |
128 |
#ifdef DEBUG |
129 |
fprintf(stderr, "New incident (theta,phi)=(%f,%f)\n", |
130 |
inpfile[i].theta, inpfile[i].phi); |
131 |
#endif |
132 |
new_bsdf_data(inpfile[i].theta, inpfile[i].phi); |
133 |
} |
134 |
#ifdef DEBUG |
135 |
fprintf(stderr, "Loading measurements from '%s'...\n", inpfile[i].fname); |
136 |
#endif |
137 |
/* read scattering data */ |
138 |
while (fscanf(fp, "%lf %lf %lf\n", &theta_out, &phi_out, &val) == 3) |
139 |
add_bsdf_data(theta_out, phi_out, val, inpfile[i].isDSF); |
140 |
n = 0; |
141 |
while ((c = getc(fp)) != EOF) |
142 |
n += !isspace(c); |
143 |
if (n) |
144 |
fprintf(stderr, |
145 |
"%s: warning: %d unexpected characters past EOD\n", |
146 |
inpfile[i].fname, n); |
147 |
fclose(fp); |
148 |
return(1); |
149 |
} |
150 |
|
151 |
#ifndef TEST_MAIN |
152 |
/* Read in PAB-Opto BSDF files and output RBF interpolant */ |
153 |
int |
154 |
main(int argc, char *argv[]) |
155 |
{ |
156 |
extern int nprocs; |
157 |
int i; |
158 |
/* start header */ |
159 |
SET_FILE_BINARY(stdout); |
160 |
newheader("RADIANCE", stdout); |
161 |
printargs(argc, argv, stdout); |
162 |
fputnow(stdout); |
163 |
progname = argv[0]; /* get options */ |
164 |
while (argc > 2 && argv[1][0] == '-') { |
165 |
switch (argv[1][1]) { |
166 |
case 'n': |
167 |
nprocs = atoi(argv[2]); |
168 |
break; |
169 |
default: |
170 |
goto userr; |
171 |
} |
172 |
argv += 2; argc -= 2; |
173 |
} |
174 |
/* initialize & sort inputs */ |
175 |
ninpfiles = argc - 1; |
176 |
if (ninpfiles < 2) |
177 |
goto userr; |
178 |
inpfile = (PGINPUT *)malloc(sizeof(PGINPUT)*ninpfiles); |
179 |
if (inpfile == NULL) |
180 |
return(1); |
181 |
for (i = 0; i < ninpfiles; i++) |
182 |
if (!init_pabopto_inp(i, argv[i+1])) |
183 |
return(1); |
184 |
qsort(inpfile, ninpfiles, sizeof(PGINPUT), &cmp_inang); |
185 |
/* compile measurements */ |
186 |
for (i = 0; i < ninpfiles; i++) |
187 |
if (!add_pabopto_inp(i)) |
188 |
return(1); |
189 |
make_rbfrep(); /* process last data set */ |
190 |
build_mesh(); /* create interpolation */ |
191 |
save_bsdf_rep(stdout); /* write it out */ |
192 |
return(0); |
193 |
userr: |
194 |
fprintf(stderr, "Usage: %s [-n nproc] meas1.dat meas2.dat .. > bsdf.sir\n", |
195 |
progname); |
196 |
return(1); |
197 |
} |
198 |
#else |
199 |
/* Test main produces a Radiance model from the given input file */ |
200 |
int |
201 |
main(int argc, char *argv[]) |
202 |
{ |
203 |
PGINPUT pginp; |
204 |
char buf[128]; |
205 |
FILE *pfp; |
206 |
double bsdf, min_log; |
207 |
FVECT dir; |
208 |
int i, j, n; |
209 |
|
210 |
if (argc != 2) { |
211 |
fprintf(stderr, "Usage: %s input.dat > output.rad\n", argv[0]); |
212 |
return(1); |
213 |
} |
214 |
ninpfiles = 1; |
215 |
inpfile = &pginp; |
216 |
if (!init_pabopto_inp(0, argv[1]) || !add_pabopto_inp(0)) |
217 |
return(1); |
218 |
/* reduce data set */ |
219 |
make_rbfrep(); |
220 |
#ifdef DEBUG |
221 |
fprintf(stderr, "Minimum BSDF = %.4f\n", bsdf_min); |
222 |
#endif |
223 |
min_log = log(bsdf_min*.5 + 1e-5); |
224 |
#if 1 /* produce spheres at meas. */ |
225 |
puts("void plastic yellow\n0\n0\n5 .6 .4 .01 .04 .08\n"); |
226 |
n = 0; |
227 |
for (i = 0; i < GRIDRES; i++) |
228 |
for (j = 0; j < GRIDRES; j++) |
229 |
if (dsf_grid[i][j].nval > 0) { |
230 |
ovec_from_pos(dir, i, j); |
231 |
bsdf = dsf_grid[i][j].vsum / |
232 |
(dsf_grid[i][j].nval*output_orient*dir[2]); |
233 |
if (bsdf <= bsdf_min*.6) |
234 |
continue; |
235 |
bsdf = log(bsdf + 1e-5) - min_log; |
236 |
ovec_from_pos(dir, i, j); |
237 |
printf("yellow sphere s%04d\n0\n0\n", ++n); |
238 |
printf("4 %.6g %.6g %.6g %.6g\n\n", |
239 |
dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf, |
240 |
.007*bsdf); |
241 |
} |
242 |
#endif |
243 |
#if 1 /* spheres at RBF peaks */ |
244 |
puts("void plastic red\n0\n0\n5 .8 .01 .01 .04 .08\n"); |
245 |
for (n = 0; n < dsf_list->nrbf; n++) { |
246 |
RBFVAL *rbf = &dsf_list->rbfa[n]; |
247 |
ovec_from_pos(dir, rbf->gx, rbf->gy); |
248 |
bsdf = eval_rbfrep(dsf_list, dir) / (output_orient*dir[2]); |
249 |
bsdf = log(bsdf + 1e-5) - min_log; |
250 |
printf("red sphere p%04d\n0\n0\n", ++n); |
251 |
printf("4 %.6g %.6g %.6g %.6g\n\n", |
252 |
dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf, |
253 |
.011*bsdf); |
254 |
} |
255 |
#endif |
256 |
#if 1 /* output continuous surface */ |
257 |
puts("void trans tgreen\n0\n0\n7 .7 1 .7 .04 .04 .9 1\n"); |
258 |
fflush(stdout); |
259 |
sprintf(buf, "gensurf tgreen bsdf - - - %d %d", GRIDRES-1, GRIDRES-1); |
260 |
pfp = popen(buf, "w"); |
261 |
if (pfp == NULL) { |
262 |
fprintf(stderr, "%s: cannot open '| %s'\n", argv[0], buf); |
263 |
return(1); |
264 |
} |
265 |
for (i = 0; i < GRIDRES; i++) |
266 |
for (j = 0; j < GRIDRES; j++) { |
267 |
ovec_from_pos(dir, i, j); |
268 |
bsdf = eval_rbfrep(dsf_list, dir) / (output_orient*dir[2]); |
269 |
bsdf = log(bsdf + 1e-5) - min_log; |
270 |
fprintf(pfp, "%.8e %.8e %.8e\n", |
271 |
dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf); |
272 |
} |
273 |
if (pclose(pfp) != 0) |
274 |
return(1); |
275 |
#endif |
276 |
return(0); |
277 |
} |
278 |
#endif |