11 |
|
#include "face.h" |
12 |
|
#include "cone.h" |
13 |
|
#include "source.h" |
14 |
+ |
#include "paths.h" |
15 |
|
|
16 |
+ |
#ifndef NBSDFSAMPS |
17 |
+ |
#define NBSDFSAMPS 256 /* BSDF resampling count */ |
18 |
+ |
#endif |
19 |
|
|
20 |
|
COLORV * distarr = NULL; /* distribution array */ |
21 |
|
int distsiz = 0; |
22 |
|
COLORV * direct_discount = NULL; /* amount to take off direct */ |
23 |
|
|
24 |
+ |
|
25 |
|
void |
26 |
|
newdist( /* allocate & clear distribution array */ |
27 |
|
int siz |
29 |
|
{ |
30 |
|
if (siz <= 0) { |
31 |
|
if (distsiz > 0) |
32 |
< |
free((void *)distarr); |
32 |
> |
free(distarr); |
33 |
|
distarr = NULL; |
34 |
|
distsiz = 0; |
35 |
|
return; |
36 |
|
} |
37 |
|
if (distsiz < siz) { |
38 |
|
if (distsiz > 0) |
39 |
< |
free((void *)distarr); |
39 |
> |
free(distarr); |
40 |
|
distarr = (COLORV *)malloc(sizeof(COLOR)*siz); |
41 |
|
if (distarr == NULL) |
42 |
|
error(SYSTEM, "out of memory in newdist"); |
62 |
|
{ |
63 |
|
if (direct_discount == NULL) |
64 |
|
return; |
65 |
< |
free((void *)direct_discount); |
65 |
> |
free(direct_discount); |
66 |
|
direct_discount = NULL; |
67 |
|
} |
68 |
|
|
108 |
|
VCOPY(myRay.rorg, org); |
109 |
|
VCOPY(myRay.rdir, dir); |
110 |
|
myRay.rmax = .0; |
111 |
< |
rayorigin(&myRay, PRIMARY, NULL, NULL); |
111 |
> |
rayorigin(&myRay, PRIMARY|SPECULAR, NULL, NULL); |
112 |
|
myRay.rno = ndx; |
113 |
|
/* queue ray, check result */ |
114 |
|
process_ray(&myRay, ray_pqueue(&myRay)); |
249 |
|
dv[2] = sqrt(1. - alt); |
250 |
|
} |
251 |
|
|
252 |
+ |
|
253 |
|
int |
254 |
|
flatindex( /* compute index for hemispherical direction */ |
255 |
|
FVECT dv, |
271 |
|
|
272 |
|
|
273 |
|
int |
274 |
+ |
printgeom( /* print out detailed geometry for BSDF */ |
275 |
+ |
struct BSDF_data *sd, |
276 |
+ |
char *xfrot, |
277 |
+ |
FVECT ctr, |
278 |
+ |
double s1, |
279 |
+ |
double s2 |
280 |
+ |
) |
281 |
+ |
{ |
282 |
+ |
static char mgftemp[] = TEMPLATE; |
283 |
+ |
char cmdbuf[64]; |
284 |
+ |
FILE *fp; |
285 |
+ |
double sca; |
286 |
+ |
|
287 |
+ |
if (sd == NULL || sd->mgf == NULL) |
288 |
+ |
return(0); |
289 |
+ |
if (sd->dim[0] <= FTINY || sd->dim[1] <= FTINY) |
290 |
+ |
return(0); |
291 |
+ |
if ((s1 > s2) ^ (sd->dim[0] > sd->dim[1])) { |
292 |
+ |
sca = s1; s1 = s2; s2 = sca; |
293 |
+ |
} |
294 |
+ |
s1 /= sd->dim[0]; |
295 |
+ |
s2 /= sd->dim[1]; |
296 |
+ |
sca = s1 > s2 ? s1 : s2; |
297 |
+ |
strcpy(mgftemp, TEMPLATE); |
298 |
+ |
if ((fp = fopen(mktemp(mgftemp), "w")) == NULL) |
299 |
+ |
error(SYSTEM, "cannot create temporary file for MGF"); |
300 |
+ |
/* prepend our transform */ |
301 |
+ |
fprintf(fp, "xf%s -s %.5f -t %.5g %.5g %.5g\n", |
302 |
+ |
xfrot, sca, ctr[0], ctr[1], ctr[2]); |
303 |
+ |
/* output given MGF description */ |
304 |
+ |
fputs(sd->mgf, fp); |
305 |
+ |
fputs("\nxf\n", fp); |
306 |
+ |
if (fclose(fp) == EOF) |
307 |
+ |
error(SYSTEM, "error writing MGF temporary file"); |
308 |
+ |
/* execute mgf2rad to convert MGF */ |
309 |
+ |
strcpy(cmdbuf, "mgf2rad "); |
310 |
+ |
strcpy(cmdbuf+8, mgftemp); |
311 |
+ |
fflush(stdout); |
312 |
+ |
system(cmdbuf); |
313 |
+ |
unlink(mgftemp); /* clean up */ |
314 |
+ |
return(1); |
315 |
+ |
} |
316 |
+ |
|
317 |
+ |
|
318 |
+ |
int |
319 |
|
my_default( /* default illum action */ |
320 |
|
OBJREC *ob, |
321 |
|
struct illum_args *il, |
345 |
|
FVECT u, v; |
346 |
|
double ur[2], vr[2]; |
347 |
|
MAT4 xfm; |
348 |
+ |
char xfrot[64]; |
349 |
|
int nallow; |
350 |
|
FACE *fa; |
351 |
|
int i, j; |
357 |
|
} |
358 |
|
/* set up sampling */ |
359 |
|
if (il->sd != NULL) { |
360 |
< |
if (!getBSDF_xfm(xfm, fa->norm, il->udir)) { |
360 |
> |
if (!getBSDF_xfm(xfm, fa->norm, il->udir, xfrot)) { |
361 |
|
objerror(ob, WARNING, "illegal up direction"); |
362 |
|
freeface(ob); |
363 |
|
return(my_default(ob, il, nm)); |
399 |
|
if (r2 < vr[0]) vr[0] = r2; |
400 |
|
if (r2 > vr[1]) vr[1] = r2; |
401 |
|
} |
402 |
+ |
/* output detailed geometry? */ |
403 |
+ |
if (!(il->flags & IL_LIGHT) && il->sd != NULL && il->sd->mgf != NULL && |
404 |
+ |
il->thick <= FTINY) { |
405 |
+ |
for (j = 3; j--; ) |
406 |
+ |
org[j] = .5*(ur[0]+ur[1])*u[j] + |
407 |
+ |
.5*(vr[0]+vr[1])*v[j] + |
408 |
+ |
fa->offset*fa->norm[j]; |
409 |
+ |
printgeom(il->sd, xfrot, org, ur[1]-ur[0], vr[1]-vr[0]); |
410 |
+ |
} |
411 |
|
dim[0] = random(); |
412 |
|
/* sample polygon */ |
413 |
|
nallow = 5*n*il->nsamps; |
452 |
|
raysamp(dim[1], org, dir); |
453 |
|
} |
454 |
|
/* add in direct component? */ |
455 |
< |
if (!directvis && (il->flags & IL_LIGHT || il->sd != NULL)) { |
455 |
> |
if (il->flags & IL_LIGHT || il->sd != NULL) { |
456 |
|
MAT4 ixfm; |
457 |
|
if (il->sd == NULL) { |
458 |
|
for (i = 3; i--; ) { |
606 |
|
co = getcone(ob, 0); |
607 |
|
/* set up sampling */ |
608 |
|
if (il->sd != NULL) { |
609 |
< |
if (!getBSDF_xfm(xfm, co->ad, il->udir)) { |
609 |
> |
if (!getBSDF_xfm(xfm, co->ad, il->udir, NULL)) { |
610 |
|
objerror(ob, WARNING, "illegal up direction"); |
611 |
|
freecone(ob); |
612 |
|
return(my_default(ob, il, nm)); |
660 |
|
raysamp(dim[1], org, dir); |
661 |
|
} |
662 |
|
/* add in direct component? */ |
663 |
< |
if (!directvis && (il->flags & IL_LIGHT || il->sd != NULL)) { |
663 |
> |
if (il->flags & IL_LIGHT || il->sd != NULL) { |
664 |
|
MAT4 ixfm; |
665 |
|
if (il->sd == NULL) { |
666 |
|
for (i = 3; i--; ) { |
714 |
|
/* clean up */ |
715 |
|
freecone(ob); |
716 |
|
return(1); |
717 |
+ |
} |
718 |
+ |
|
719 |
+ |
|
720 |
+ |
void |
721 |
+ |
redistribute( /* pass distarr ray sums through BSDF */ |
722 |
+ |
struct BSDF_data *b, |
723 |
+ |
int nalt, |
724 |
+ |
int nazi, |
725 |
+ |
FVECT u, |
726 |
+ |
FVECT v, |
727 |
+ |
FVECT w, |
728 |
+ |
MAT4 xm |
729 |
+ |
) |
730 |
+ |
{ |
731 |
+ |
int nout = 0; |
732 |
+ |
MAT4 mymat, inmat; |
733 |
+ |
COLORV *idist; |
734 |
+ |
COLORV *cp; |
735 |
+ |
FVECT dv; |
736 |
+ |
double wt; |
737 |
+ |
int i, j, k, c, o; |
738 |
+ |
COLOR col, cinc; |
739 |
+ |
/* copy incoming distribution */ |
740 |
+ |
if (b->ninc > distsiz) |
741 |
+ |
error(INTERNAL, "error 1 in redistribute"); |
742 |
+ |
idist = (COLORV *)malloc(sizeof(COLOR)*b->ninc); |
743 |
+ |
if (idist == NULL) |
744 |
+ |
error(SYSTEM, "out of memory in redistribute"); |
745 |
+ |
memcpy(idist, distarr, sizeof(COLOR)*b->ninc); |
746 |
+ |
/* compose direction transform */ |
747 |
+ |
for (i = 3; i--; ) { |
748 |
+ |
mymat[i][0] = u[i]; |
749 |
+ |
mymat[i][1] = v[i]; |
750 |
+ |
mymat[i][2] = w[i]; |
751 |
+ |
mymat[i][3] = 0.; |
752 |
+ |
} |
753 |
+ |
mymat[3][0] = mymat[3][1] = mymat[3][2] = 0.; |
754 |
+ |
mymat[3][3] = 1.; |
755 |
+ |
if (xm != NULL) |
756 |
+ |
multmat4(mymat, xm, mymat); |
757 |
+ |
for (i = 3; i--; ) { /* make sure it's normalized */ |
758 |
+ |
wt = 1./sqrt( mymat[0][i]*mymat[0][i] + |
759 |
+ |
mymat[1][i]*mymat[1][i] + |
760 |
+ |
mymat[2][i]*mymat[2][i] ); |
761 |
+ |
for (j = 3; j--; ) |
762 |
+ |
mymat[j][i] *= wt; |
763 |
+ |
} |
764 |
+ |
if (!invmat4(inmat, mymat)) /* need inverse as well */ |
765 |
+ |
error(INTERNAL, "cannot invert BSDF transform"); |
766 |
+ |
newdist(nalt*nazi); /* resample distribution */ |
767 |
+ |
for (i = b->ninc; i--; ) { |
768 |
+ |
int direct_out = -1; |
769 |
+ |
COLOR cdir; |
770 |
+ |
getBSDF_incvec(dv, b, i); /* compute incident irrad. */ |
771 |
+ |
multv3(dv, dv, mymat); |
772 |
+ |
if (dv[2] < 0.0) { |
773 |
+ |
dv[0] = -dv[0]; dv[1] = -dv[1]; dv[2] = -dv[2]; |
774 |
+ |
direct_out += (direct_discount != NULL); |
775 |
+ |
} |
776 |
+ |
wt = getBSDF_incohm(b, i); |
777 |
+ |
wt *= dv[2]; /* solid_angle*cosine(theta) */ |
778 |
+ |
cp = &idist[3*i]; |
779 |
+ |
copycolor(cinc, cp); |
780 |
+ |
scalecolor(cinc, wt); |
781 |
+ |
if (!direct_out) { /* discount direct contr. */ |
782 |
+ |
cp = &direct_discount[3*i]; |
783 |
+ |
copycolor(cdir, cp); |
784 |
+ |
scalecolor(cdir, -wt); |
785 |
+ |
if (b->nout != b->ninc) |
786 |
+ |
direct_out = flatindex(dv, nalt, nazi); |
787 |
+ |
else |
788 |
+ |
direct_out = i; /* assumes dist. mirroring */ |
789 |
+ |
} |
790 |
+ |
for (k = nalt; k--; ) /* loop over distribution */ |
791 |
+ |
for (j = nazi; j--; ) { |
792 |
+ |
int rstart = random(); |
793 |
+ |
for (c = NBSDFSAMPS; c--; ) { |
794 |
+ |
double sp[2]; |
795 |
+ |
multisamp(sp, 2, urand(rstart+c)); |
796 |
+ |
flatdir(dv, (k + sp[0])/nalt, |
797 |
+ |
(j + .5 - sp[1])/nazi); |
798 |
+ |
multv3(dv, dv, inmat); |
799 |
+ |
/* evaluate BSDF @ outgoing */ |
800 |
+ |
o = getBSDF_outndx(b, dv); |
801 |
+ |
if (o < 0) { |
802 |
+ |
nout++; |
803 |
+ |
continue; |
804 |
+ |
} |
805 |
+ |
wt = BSDF_value(b, i, o) * (1./NBSDFSAMPS); |
806 |
+ |
copycolor(col, cinc); |
807 |
+ |
if (b->nout != b->ninc) |
808 |
+ |
o = k*nazi + j; |
809 |
+ |
if (o == direct_out) |
810 |
+ |
addcolor(col, cdir); /* minus direct */ |
811 |
+ |
scalecolor(col, wt); |
812 |
+ |
cp = &distarr[3*(k*nazi + j)]; |
813 |
+ |
addcolor(cp, col); /* sum into distribution */ |
814 |
+ |
} |
815 |
+ |
} |
816 |
+ |
} |
817 |
+ |
free(idist); /* free temp space */ |
818 |
+ |
if (nout) { |
819 |
+ |
sprintf(errmsg, "missing %.1f%% of BSDF directions", |
820 |
+ |
100.*nout/(b->ninc*nalt*nazi*NBSDFSAMPS)); |
821 |
+ |
error(WARNING, errmsg); |
822 |
+ |
} |
823 |
|
} |