252 |
|
return(NULL); /* gratis return */ |
253 |
|
} |
254 |
|
|
255 |
< |
/* Multiply two matrices (or a matrix and a vector) and allocate the result*/ |
255 |
> |
/* Scale a matrix by a single value */ |
256 |
|
static CMATRIX * |
257 |
+ |
cm_scale(const CMATRIX *cm1, const COLOR sca) |
258 |
+ |
{ |
259 |
+ |
CMATRIX *cmr; |
260 |
+ |
int dr, dc; |
261 |
+ |
|
262 |
+ |
cmr = cm_alloc(cm1->nrows, cm1->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 |
+ |
const COLORV *sp = cm_lval(cm1,dr,dc); |
268 |
+ |
COLORV *dp = cm_lval(cmr,dr,dc); |
269 |
+ |
dp[0] = sp[0] * sca[0]; |
270 |
+ |
dp[1] = sp[1] * sca[1]; |
271 |
+ |
dp[2] = sp[2] * sca[2]; |
272 |
+ |
} |
273 |
+ |
return(cmr); |
274 |
+ |
} |
275 |
+ |
|
276 |
+ |
/* Multiply two matrices (or a matrix and a vector) and allocate the result */ |
277 |
+ |
static CMATRIX * |
278 |
|
cm_multiply(const CMATRIX *cm1, const CMATRIX *cm2) |
279 |
|
{ |
280 |
|
CMATRIX *cmr; |
353 |
|
|
354 |
|
/* Load and convert a matrix BSDF from the given XML file */ |
355 |
|
static CMATRIX * |
356 |
< |
cm_loadBSDF(char *fname) |
356 |
> |
cm_loadBSDF(char *fname, COLOR cLamb) |
357 |
|
{ |
358 |
< |
CMATRIX *Tmat; |
359 |
< |
char *fpath; |
360 |
< |
SDError ec; |
361 |
< |
SDData myBSDF; |
362 |
< |
COLOR bsdfLamb, specCol; |
358 |
> |
CMATRIX *Tmat; |
359 |
> |
char *fpath; |
360 |
> |
SDError ec; |
361 |
> |
SDData myBSDF; |
362 |
> |
SDSpectralDF *tdf; |
363 |
> |
COLOR bsdfLamb, specCol; |
364 |
|
/* find path to BSDF file */ |
365 |
|
fpath = getpath(fname, getrlibpath(), R_OK); |
366 |
|
if (fpath == NULL) { |
371 |
|
ec = SDloadFile(&myBSDF, fpath); |
372 |
|
if (ec) |
373 |
|
error(USER, transSDError(ec)); |
374 |
< |
if (myBSDF.tf == NULL || myBSDF.tf->ncomp != 1 || |
375 |
< |
myBSDF.tf->comp[0].func != &SDhandleMtx) { |
374 |
> |
ccy2rgb(&myBSDF.tLamb.spec, myBSDF.tLamb.cieY/PI, bsdfLamb); |
375 |
> |
tdf = (myBSDF.tf != NULL) ? myBSDF.tf : myBSDF.tb; |
376 |
> |
if (tdf == NULL) { /* no non-Lambertian transmission? */ |
377 |
> |
if (cLamb != NULL) |
378 |
> |
copycolor(cLamb, bsdfLamb); |
379 |
> |
SDfreeBSDF(&myBSDF); |
380 |
> |
return(NULL); |
381 |
> |
} |
382 |
> |
if (tdf->ncomp != 1 || tdf->comp[0].func != &SDhandleMtx) { |
383 |
|
sprintf(errmsg, "unsupported BSDF '%s'", fpath); |
384 |
|
error(USER, errmsg); |
385 |
|
} |
386 |
|
/* convert BTDF to matrix */ |
387 |
< |
ccy2rgb(&myBSDF.tLamb.spec, myBSDF.tLamb.cieY/PI, bsdfLamb); |
388 |
< |
ccy2rgb(&myBSDF.tf->comp[0].cspec[0], 1., specCol); |
389 |
< |
Tmat = cm_bsdf(bsdfLamb, specCol, (SDMat *)myBSDF.tf->comp[0].dist); |
387 |
> |
ccy2rgb(&tdf->comp[0].cspec[0], 1., specCol); |
388 |
> |
Tmat = cm_bsdf(bsdfLamb, specCol, (SDMat *)tdf->comp[0].dist); |
389 |
> |
if (cLamb != NULL) /* Lambertian is included */ |
390 |
> |
setcolor(cLamb, .0, .0, .0); |
391 |
|
/* free BSDF and return */ |
392 |
|
SDfreeBSDF(&myBSDF); |
393 |
|
return(Tmat); |
496 |
|
int |
497 |
|
main(int argc, char *argv[]) |
498 |
|
{ |
499 |
< |
CMATRIX *cvec; |
499 |
> |
CMATRIX *cvec; /* component vector result */ |
500 |
|
|
501 |
|
progname = argv[0]; |
502 |
|
|
509 |
|
|
510 |
|
if (argc > 3) { /* VTDs expression */ |
511 |
|
CMATRIX *svec, *Dmat, *Tmat, *ivec; |
512 |
+ |
COLOR tLamb; |
513 |
|
/* get sky vector */ |
514 |
|
svec = cm_load(argv[4], 0, 1, DTascii); |
515 |
|
/* load BSDF */ |
516 |
< |
Tmat = cm_loadBSDF(argv[2]); |
516 |
> |
Tmat = cm_loadBSDF(argv[2], tLamb); |
517 |
|
/* load Daylight matrix */ |
518 |
< |
Dmat = cm_load(argv[3], Tmat->ncols, svec->nrows, DTfromHeader); |
518 |
> |
Dmat = cm_load(argv[3], Tmat==NULL ? 0 : Tmat->ncols, |
519 |
> |
svec->nrows, DTfromHeader); |
520 |
|
/* multiply vector through */ |
521 |
|
ivec = cm_multiply(Dmat, svec); |
522 |
|
cm_free(Dmat); cm_free(svec); |
523 |
< |
cvec = cm_multiply(Tmat, ivec); /* cvec = component vector */ |
524 |
< |
cm_free(Tmat); cm_free(ivec); |
523 |
> |
if (Tmat == NULL) { /* diffuse only */ |
524 |
> |
cvec = cm_scale(ivec, tLamb); |
525 |
> |
} else { /* else apply BTDF matrix */ |
526 |
> |
cvec = cm_multiply(Tmat, ivec); |
527 |
> |
cm_free(Tmat); |
528 |
> |
} |
529 |
> |
cm_free(ivec); |
530 |
|
} else { /* else just use sky vector */ |
531 |
|
cvec = cm_load(argv[2], 0, 1, DTascii); |
532 |
|
} |