1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: dctimestep.c,v 2.13 2010/07/01 22:44:25 greg Exp $"; |
3 |
#endif |
4 |
/* |
5 |
* Compute time-step result using Daylight Coefficient method. |
6 |
* |
7 |
* G. Ward |
8 |
*/ |
9 |
|
10 |
#include <ctype.h> |
11 |
#include "standard.h" |
12 |
#include "platform.h" |
13 |
#include "color.h" |
14 |
#include "resolu.h" |
15 |
#include "bsdf.h" |
16 |
|
17 |
char *progname; /* global argv[0] */ |
18 |
|
19 |
/* Data types for file loading */ |
20 |
enum {DTfromHeader, DTascii, DTfloat, DTdouble, DTrgbe, DTxyze}; |
21 |
|
22 |
/* A color coefficient matrix -- vectors have ncols==1 */ |
23 |
typedef struct { |
24 |
int nrows, ncols; |
25 |
COLORV cmem[3]; /* extends struct */ |
26 |
} CMATRIX; |
27 |
|
28 |
#define COLSPEC (sizeof(COLORV)==sizeof(float) ? "%f %f %f" : "%lf %lf %lf") |
29 |
|
30 |
#define cm_lval(cm,r,c) ((cm)->cmem + 3*((r)*(cm)->ncols + (c))) |
31 |
|
32 |
#define cv_lval(cm,i) ((cm)->cmem + 3*(i)) |
33 |
|
34 |
/* Allocate a color coefficient matrix */ |
35 |
static CMATRIX * |
36 |
cm_alloc(int nrows, int ncols) |
37 |
{ |
38 |
CMATRIX *cm; |
39 |
|
40 |
if ((nrows <= 0) | (ncols <= 0)) |
41 |
error(USER, "attempt to create empty matrix"); |
42 |
cm = (CMATRIX *)malloc(sizeof(CMATRIX) + |
43 |
3*sizeof(COLORV)*(nrows*ncols - 1)); |
44 |
if (cm == NULL) |
45 |
error(SYSTEM, "out of memory in cm_alloc()"); |
46 |
cm->nrows = nrows; |
47 |
cm->ncols = ncols; |
48 |
return(cm); |
49 |
} |
50 |
|
51 |
#define cm_free(cm) free(cm) |
52 |
|
53 |
/* Resize color coefficient matrix */ |
54 |
static CMATRIX * |
55 |
cm_resize(CMATRIX *cm, int nrows) |
56 |
{ |
57 |
if (nrows == cm->nrows) |
58 |
return(cm); |
59 |
if (nrows <= 0) { |
60 |
cm_free(cm); |
61 |
return(NULL); |
62 |
} |
63 |
cm = (CMATRIX *)realloc(cm, sizeof(CMATRIX) + |
64 |
3*sizeof(COLORV)*(nrows*cm->ncols - 1)); |
65 |
if (cm == NULL) |
66 |
error(SYSTEM, "out of memory in cm_resize()"); |
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cm->nrows = nrows; |
68 |
return(cm); |
69 |
} |
70 |
|
71 |
/* Load header to obtain data type */ |
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static int |
73 |
getDT(char *s, void *p) |
74 |
{ |
75 |
char fmt[32]; |
76 |
|
77 |
if (formatval(fmt, s)) { |
78 |
if (!strcmp(fmt, "ascii")) |
79 |
*((int *)p) = DTascii; |
80 |
else if (!strcmp(fmt, "float")) |
81 |
*((int *)p) = DTfloat; |
82 |
else if (!strcmp(fmt, "double")) |
83 |
*((int *)p) = DTdouble; |
84 |
else if (!strcmp(fmt, COLRFMT)) |
85 |
*((int *)p) = DTrgbe; |
86 |
else if (!strcmp(fmt, CIEFMT)) |
87 |
*((int *)p) = DTxyze; |
88 |
} |
89 |
return(0); |
90 |
} |
91 |
|
92 |
static int |
93 |
getDTfromHeader(FILE *fp) |
94 |
{ |
95 |
int dt = DTfromHeader; |
96 |
|
97 |
if (getheader(fp, getDT, &dt) < 0) |
98 |
error(SYSTEM, "header read error"); |
99 |
if (dt == DTfromHeader) |
100 |
error(USER, "missing data format in header"); |
101 |
return(dt); |
102 |
} |
103 |
|
104 |
/* Allocate and load a matrix from the given file (or stdin if NULL) */ |
105 |
static CMATRIX * |
106 |
cm_load(const char *fname, int nrows, int ncols, int dtype) |
107 |
{ |
108 |
CMATRIX *cm; |
109 |
FILE *fp = stdin; |
110 |
|
111 |
if (ncols <= 0) |
112 |
error(USER, "Non-positive number of columns"); |
113 |
if (fname == NULL) |
114 |
fname = "<stdin>"; |
115 |
else if ((fp = fopen(fname, "r")) == NULL) { |
116 |
sprintf(errmsg, "cannot open file '%s'", fname); |
117 |
error(SYSTEM, errmsg); |
118 |
} |
119 |
if (dtype != DTascii) |
120 |
SET_FILE_BINARY(fp); |
121 |
if (dtype == DTfromHeader) |
122 |
dtype = getDTfromHeader(fp); |
123 |
switch (dtype) { |
124 |
case DTascii: |
125 |
case DTfloat: |
126 |
case DTdouble: |
127 |
break; |
128 |
default: |
129 |
error(USER, "unexpected data type in cm_load()"); |
130 |
} |
131 |
if (nrows <= 0) { /* don't know length? */ |
132 |
int guessrows = 147; /* usually big enough */ |
133 |
if ((dtype != DTascii) & (fp != stdin)) { |
134 |
long startpos = ftell(fp); |
135 |
if (fseek(fp, 0L, SEEK_END) == 0) { |
136 |
long endpos = ftell(fp); |
137 |
long elemsiz = 3*(dtype==DTfloat ? |
138 |
sizeof(float) : sizeof(double)); |
139 |
|
140 |
if ((endpos - startpos) % (ncols*elemsiz)) { |
141 |
sprintf(errmsg, |
142 |
"improper length for binary file '%s'", |
143 |
fname); |
144 |
error(USER, errmsg); |
145 |
} |
146 |
guessrows = (endpos - startpos)/(ncols*elemsiz); |
147 |
if (fseek(fp, startpos, SEEK_SET) < 0) { |
148 |
sprintf(errmsg, |
149 |
"fseek() error on file '%s'", |
150 |
fname); |
151 |
error(SYSTEM, errmsg); |
152 |
} |
153 |
nrows = guessrows; /* we're confident */ |
154 |
} |
155 |
} |
156 |
cm = cm_alloc(guessrows, ncols); |
157 |
} else |
158 |
cm = cm_alloc(nrows, ncols); |
159 |
if (cm == NULL) |
160 |
return(NULL); |
161 |
if (dtype == DTascii) { /* read text file */ |
162 |
int maxrow = (nrows > 0 ? nrows : 32000); |
163 |
int r, c; |
164 |
for (r = 0; r < maxrow; r++) { |
165 |
if (r >= cm->nrows) /* need more space? */ |
166 |
cm = cm_resize(cm, 2*cm->nrows); |
167 |
for (c = 0; c < ncols; c++) { |
168 |
COLORV *cv = cm_lval(cm,r,c); |
169 |
if (fscanf(fp, COLSPEC, cv, cv+1, cv+2) != 3) |
170 |
if ((nrows <= 0) & (r > 0) & !c) { |
171 |
cm = cm_resize(cm, maxrow=r); |
172 |
break; |
173 |
} else |
174 |
goto EOFerror; |
175 |
} |
176 |
} |
177 |
while ((c = getc(fp)) != EOF) |
178 |
if (!isspace(c)) { |
179 |
sprintf(errmsg, |
180 |
"unexpected data at end of ascii file %s", |
181 |
fname); |
182 |
error(WARNING, errmsg); |
183 |
break; |
184 |
} |
185 |
} else { /* read binary file */ |
186 |
if (sizeof(COLORV) == (dtype==DTfloat ? sizeof(float) : |
187 |
sizeof(double))) { |
188 |
int nread = 0; |
189 |
do { /* read all we can */ |
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nread += fread(cm->cmem + 3*nread, |
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3*sizeof(COLORV), |
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cm->nrows*cm->ncols - nread, |
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fp); |
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if (nrows <= 0) { /* unknown length */ |
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if (nread == cm->nrows*cm->ncols) |
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/* need more space? */ |
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cm = cm_resize(cm, 2*cm->nrows); |
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else if (nread && !(nread % cm->ncols)) |
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/* seem to be done */ |
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cm = cm_resize(cm, nread/cm->ncols); |
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else /* ended mid-row */ |
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goto EOFerror; |
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} else if (nread < cm->nrows*cm->ncols) |
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goto EOFerror; |
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} while (nread < cm->nrows*cm->ncols); |
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|
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} else if (dtype == DTdouble) { |
208 |
double dc[3]; /* load from double */ |
209 |
COLORV *cvp = cm->cmem; |
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int n = nrows*ncols; |
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|
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if (n <= 0) |
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goto not_handled; |
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while (n--) { |
215 |
if (fread(dc, sizeof(double), 3, fp) != 3) |
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goto EOFerror; |
217 |
copycolor(cvp, dc); |
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cvp += 3; |
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} |
220 |
} else /* dtype == DTfloat */ { |
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float fc[3]; /* load from float */ |
222 |
COLORV *cvp = cm->cmem; |
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int n = nrows*ncols; |
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|
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if (n <= 0) |
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goto not_handled; |
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while (n--) { |
228 |
if (fread(fc, sizeof(float), 3, fp) != 3) |
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goto EOFerror; |
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copycolor(cvp, fc); |
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cvp += 3; |
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} |
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} |
234 |
if (getc(fp) != EOF) { |
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sprintf(errmsg, |
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"unexpected data at end of binary file %s", |
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fname); |
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error(WARNING, errmsg); |
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} |
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} |
241 |
if (fp != stdin) |
242 |
fclose(fp); |
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return(cm); |
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EOFerror: |
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sprintf(errmsg, "unexpected EOF reading %s", |
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fname); |
247 |
error(USER, errmsg); |
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not_handled: |
249 |
error(INTERNAL, "unhandled data size or length in cm_load()"); |
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return(NULL); /* gratis return */ |
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} |
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|
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/* Multiply two matrices (or a matrix and a vector) and allocate the result*/ |
254 |
static CMATRIX * |
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cm_multiply(const CMATRIX *cm1, const CMATRIX *cm2) |
256 |
{ |
257 |
CMATRIX *cmr; |
258 |
int dr, dc, i; |
259 |
|
260 |
if ((cm1->ncols <= 0) | (cm1->ncols != cm2->nrows)) |
261 |
error(INTERNAL, "matrix dimension mismatch in cm_multiply()"); |
262 |
cmr = cm_alloc(cm1->nrows, cm2->ncols); |
263 |
if (cmr == NULL) |
264 |
return(NULL); |
265 |
for (dr = 0; dr < cmr->nrows; dr++) |
266 |
for (dc = 0; dc < cmr->ncols; dc++) { |
267 |
COLORV *dp = cm_lval(cmr,dr,dc); |
268 |
dp[0] = dp[1] = dp[2] = 0; |
269 |
for (i = 0; i < cm1->ncols; i++) { |
270 |
const COLORV *cp1 = cm_lval(cm1,dr,i); |
271 |
const COLORV *cp2 = cm_lval(cm2,i,dc); |
272 |
dp[0] += cp1[0] * cp2[0]; |
273 |
dp[1] += cp1[1] * cp2[1]; |
274 |
dp[2] += cp1[2] * cp2[2]; |
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} |
276 |
} |
277 |
return(cmr); |
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} |
279 |
|
280 |
/* print out matrix as ASCII text -- no header */ |
281 |
static void |
282 |
cm_print(const CMATRIX *cm, FILE *fp) |
283 |
{ |
284 |
int r, c; |
285 |
const COLORV *mp = cm->cmem; |
286 |
|
287 |
for (r = 0; r < cm->nrows; r++) { |
288 |
for (c = 0; c < cm->ncols; c++, mp += 3) |
289 |
fprintf(fp, "\t%.6e %.6e %.6e", mp[0], mp[1], mp[2]); |
290 |
fputc('\n', fp); |
291 |
} |
292 |
} |
293 |
|
294 |
/* convert a BSDF to our matrix representation */ |
295 |
static CMATRIX * |
296 |
cm_bsdf(const struct BSDF_data *bsdf) |
297 |
{ |
298 |
CMATRIX *cm = cm_alloc(bsdf->nout, bsdf->ninc); |
299 |
int nbadohm = 0; |
300 |
int nneg = 0; |
301 |
int r, c; |
302 |
|
303 |
for (c = 0; c < cm->ncols; c++) { |
304 |
float dom = getBSDF_incohm(bsdf,c); |
305 |
FVECT v; |
306 |
|
307 |
if (dom <= .0) { |
308 |
nbadohm++; |
309 |
continue; |
310 |
} |
311 |
if (!getBSDF_incvec(v,bsdf,c) || v[2] > FTINY) |
312 |
error(USER, "illegal incoming BTDF direction"); |
313 |
dom *= -v[2]; |
314 |
|
315 |
for (r = 0; r < cm->nrows; r++) { |
316 |
float f = BSDF_value(bsdf,c,r); |
317 |
COLORV *mp = cm_lval(cm,r,c); |
318 |
|
319 |
if (f <= .0) { |
320 |
nneg += (f < -FTINY); |
321 |
f = .0f; |
322 |
} |
323 |
mp[0] = mp[1] = mp[2] = f * dom; |
324 |
} |
325 |
} |
326 |
if (nneg || nbadohm) { |
327 |
sprintf(errmsg, |
328 |
"BTDF has %d negatives and %d bad incoming solid angles", |
329 |
nneg, nbadohm); |
330 |
error(WARNING, errmsg); |
331 |
} |
332 |
return(cm); |
333 |
} |
334 |
|
335 |
/* Sum together a set of images and write result to stdout */ |
336 |
static int |
337 |
sum_images(const char *fspec, const CMATRIX *cv, FILE *fout) |
338 |
{ |
339 |
int myDT = DTfromHeader; |
340 |
CMATRIX *pmat; |
341 |
COLOR *scanline; |
342 |
int myXR, myYR; |
343 |
int i, y; |
344 |
|
345 |
if (cv->ncols != 1) |
346 |
error(INTERNAL, "expected vector in sum_images()"); |
347 |
for (i = 0; i < cv->nrows; i++) { |
348 |
const COLORV *scv = cv_lval(cv,i); |
349 |
char fname[1024]; |
350 |
FILE *fp; |
351 |
int dt, xr, yr; |
352 |
COLORV *psp; |
353 |
/* check for zero */ |
354 |
if ((scv[RED] == .0) & (scv[GRN] == .0) & (scv[BLU] == .0)) |
355 |
continue; |
356 |
/* open next picture */ |
357 |
sprintf(fname, fspec, i); |
358 |
if ((fp = fopen(fname, "r")) == NULL) { |
359 |
sprintf(errmsg, "cannot open picture '%s'", fname); |
360 |
error(SYSTEM, errmsg); |
361 |
} |
362 |
SET_FILE_BINARY(fp); |
363 |
dt = getDTfromHeader(fp); |
364 |
if ((dt != DTrgbe) & (dt != DTxyze) || |
365 |
!fscnresolu(&xr, &yr, fp)) { |
366 |
sprintf(errmsg, "file '%s' not a picture", fname); |
367 |
error(USER, errmsg); |
368 |
} |
369 |
if (myDT == DTfromHeader) { /* on first one */ |
370 |
myDT = dt; |
371 |
myXR = xr; myYR = yr; |
372 |
scanline = (COLOR *)malloc(sizeof(COLOR)*myXR); |
373 |
if (scanline == NULL) |
374 |
error(SYSTEM, "out of memory in sum_images()"); |
375 |
pmat = cm_alloc(myYR, myXR); |
376 |
memset(pmat->cmem, 0, sizeof(COLOR)*myXR*myYR); |
377 |
/* finish header */ |
378 |
fputformat(myDT==DTrgbe ? COLRFMT : CIEFMT, fout); |
379 |
fputc('\n', fout); |
380 |
fprtresolu(myXR, myYR, fout); |
381 |
fflush(fout); |
382 |
} else if ((dt != myDT) | (xr != myXR) | (yr != myYR)) { |
383 |
sprintf(errmsg, "picture '%s' format/size mismatch", |
384 |
fname); |
385 |
error(USER, errmsg); |
386 |
} |
387 |
psp = pmat->cmem; |
388 |
for (y = 0; y < yr; y++) { /* read it in */ |
389 |
int x; |
390 |
if (freadscan(scanline, xr, fp) < 0) { |
391 |
sprintf(errmsg, "error reading picture '%s'", |
392 |
fname); |
393 |
error(SYSTEM, errmsg); |
394 |
} |
395 |
/* sum in scanline */ |
396 |
for (x = 0; x < xr; x++, psp += 3) { |
397 |
multcolor(scanline[x], scv); |
398 |
addcolor(psp, scanline[x]); |
399 |
} |
400 |
} |
401 |
fclose(fp); /* done this picture */ |
402 |
} |
403 |
free(scanline); |
404 |
/* write scanlines */ |
405 |
for (y = 0; y < myYR; y++) |
406 |
if (fwritescan((COLOR *)cm_lval(pmat, y, 0), myXR, fout) < 0) |
407 |
return(0); |
408 |
cm_free(pmat); /* all done */ |
409 |
return(fflush(fout) == 0); |
410 |
} |
411 |
|
412 |
/* check to see if a string contains a %d or %o specification */ |
413 |
static int |
414 |
hasNumberFormat(const char *s) |
415 |
{ |
416 |
while (*s && *s != '%') |
417 |
s++; |
418 |
if (!*s) |
419 |
return(0); |
420 |
do |
421 |
++s; |
422 |
while (isdigit(*s)); |
423 |
|
424 |
return(*s == 'd' | *s == 'i' | *s == 'o' | *s == 'x' | *s == 'X'); |
425 |
} |
426 |
|
427 |
int |
428 |
main(int argc, char *argv[]) |
429 |
{ |
430 |
CMATRIX *cvec; |
431 |
|
432 |
progname = argv[0]; |
433 |
|
434 |
if ((argc < 2) | (argc > 5)) { |
435 |
fprintf(stderr, "Usage: %s DCspec [tregvec]\n", progname); |
436 |
fprintf(stderr, " or: %s Vspec Tbsdf.xml Dmat.dat [tregvec]\n", |
437 |
progname); |
438 |
return(1); |
439 |
} |
440 |
|
441 |
if (argc > 3) { /* VTDs expression */ |
442 |
CMATRIX *svec, *Dmat, *Tmat, *ivec; |
443 |
struct BSDF_data *btdf; |
444 |
/* get sky vector */ |
445 |
svec = cm_load(argv[4], 0, 1, DTascii); |
446 |
/* load BSDF */ |
447 |
btdf = load_BSDF(argv[2]); |
448 |
if (btdf == NULL) |
449 |
return(1); |
450 |
/* load Daylight matrix */ |
451 |
Dmat = cm_load(argv[3], btdf->ninc, svec->nrows, DTfromHeader); |
452 |
/* multiply vector through */ |
453 |
ivec = cm_multiply(Dmat, svec); |
454 |
cm_free(Dmat); cm_free(svec); |
455 |
Tmat = cm_bsdf(btdf); /* convert BTDF to matrix */ |
456 |
free_BSDF(btdf); |
457 |
cvec = cm_multiply(Tmat, ivec); /* cvec = component vector */ |
458 |
cm_free(Tmat); cm_free(ivec); |
459 |
} else { /* else just use sky vector */ |
460 |
cvec = cm_load(argv[2], 0, 1, DTascii); |
461 |
} |
462 |
|
463 |
if (hasNumberFormat(argv[1])) { /* generating image */ |
464 |
SET_FILE_BINARY(stdout); |
465 |
newheader("RADIANCE", stdout); |
466 |
printargs(argc, argv, stdout); |
467 |
fputnow(stdout); |
468 |
if (!sum_images(argv[1], cvec, stdout)) |
469 |
return(1); |
470 |
} else { /* generating vector */ |
471 |
CMATRIX *Vmat = cm_load(argv[1], 0, cvec->nrows, DTfromHeader); |
472 |
CMATRIX *rvec = cm_multiply(Vmat, cvec); |
473 |
cm_free(Vmat); |
474 |
cm_print(rvec, stdout); |
475 |
cm_free(rvec); |
476 |
} |
477 |
cm_free(cvec); /* final clean-up */ |
478 |
return(0); |
479 |
} |