50 |
|
|
51 |
|
typedef struct { |
52 |
|
COLOR v; /* hemisphere sample value */ |
53 |
+ |
float d; /* reciprocal distance (1/rt) */ |
54 |
|
FVECT p; /* intersection point */ |
55 |
|
} AMBSAMP; /* sample value */ |
56 |
|
|
105 |
|
case VDB_xY: return(db2==VDB_x ? VDB_y : VDB_X); |
106 |
|
case VDB_Xy: return(db2==VDB_y ? VDB_x : VDB_Y); |
107 |
|
} |
108 |
< |
error(INTERNAL, "forbidden diagonal in vdb_edge()"); |
108 |
> |
error(CONSISTENCY, "forbidden diagonal in vdb_edge()"); |
109 |
|
return(-1); |
110 |
|
} |
111 |
|
|
208 |
|
AMBSAMP *ap = &ambsam(hp,i,j); |
209 |
|
RAY ar; |
210 |
|
/* generate hemispherical sample */ |
211 |
< |
if (!getambsamp(&ar, hp, i, j, 0)) |
212 |
< |
goto badsample; |
213 |
< |
/* limit vertex distance */ |
211 |
> |
if (!getambsamp(&ar, hp, i, j, 0) || ar.rt <= FTINY) { |
212 |
> |
memset(ap, 0, sizeof(AMBSAMP)); |
213 |
> |
return(NULL); |
214 |
> |
} |
215 |
> |
ap->d = 1.0/ar.rt; /* limit vertex distance */ |
216 |
|
if (ar.rt > 10.0*thescene.cusize) |
217 |
|
ar.rt = 10.0*thescene.cusize; |
215 |
– |
else if (ar.rt <= FTINY) /* should never happen! */ |
216 |
– |
goto badsample; |
218 |
|
VSUM(ap->p, ar.rorg, ar.rdir, ar.rt); |
219 |
|
copycolor(ap->v, ar.rcol); |
220 |
|
return(ap); |
220 |
– |
badsample: |
221 |
– |
setcolor(ap->v, 0., 0., 0.); |
222 |
– |
VCOPY(ap->p, hp->rp->rop); |
223 |
– |
return(NULL); |
221 |
|
} |
222 |
|
|
223 |
|
|
272 |
|
ambsupersamp(double acol[3], AMBHEMI *hp, int cnt) |
273 |
|
{ |
274 |
|
float *earr = getambdiffs(hp); |
275 |
< |
double e2sum = 0; |
275 |
> |
double e2sum = 0.0; |
276 |
|
AMBSAMP *ap; |
277 |
|
RAY ar; |
278 |
< |
COLOR asum; |
278 |
> |
double asum[3]; |
279 |
|
float *ep; |
280 |
|
int i, j, n; |
281 |
|
|
288 |
|
for (ap = hp->sa, i = 0; i < hp->ns; i++) |
289 |
|
for (j = 0; j < hp->ns; j++, ap++) { |
290 |
|
int nss = *ep/e2sum*cnt + frandom(); |
291 |
< |
setcolor(asum, 0., 0., 0.); |
291 |
> |
asum[0] = asum[1] = asum[2] = 0.0; |
292 |
|
for (n = 1; n <= nss; n++) { |
293 |
|
if (!getambsamp(&ar, hp, i, j, n)) { |
294 |
|
nss = n-1; |
299 |
|
if (nss) { /* update returned ambient value */ |
300 |
|
const double ssf = 1./(nss + 1); |
301 |
|
for (n = 3; n--; ) |
302 |
< |
acol[n] += ssf*colval(asum,n) + |
302 |
> |
acol[n] += ssf*asum[n] + |
303 |
|
(ssf - 1.)*colval(ap->v,n); |
304 |
|
} |
305 |
|
e2sum -= *ep++; /* update remainders */ |
314 |
|
vertex_flags(AMBHEMI *hp) |
315 |
|
{ |
316 |
|
uby8 *vflags = (uby8 *)calloc(hp->ns*hp->ns, sizeof(uby8)); |
320 |
– |
double *dist2a = (double *)malloc(sizeof(double)*hp->ns); |
317 |
|
uby8 *vf; |
318 |
+ |
AMBSAMP *ap; |
319 |
|
int i, j; |
320 |
|
|
321 |
< |
if ((vflags == NULL) | (dist2a == NULL)) |
321 |
> |
if (vflags == NULL) |
322 |
|
error(SYSTEM, "out of memory in vertex_flags()"); |
323 |
< |
vf = vflags; /* compute distances along first row */ |
324 |
< |
for (j = 0; j < hp->ns; j++) { |
325 |
< |
dist2a[j] = dist2(ambsam(hp,0,j).p, hp->rp->rop); |
326 |
< |
++vf; |
327 |
< |
if (!j) continue; |
331 |
< |
if (dist2a[j] >= dist2a[j-1]) |
332 |
< |
vf[0] |= 1<<VDB_x; |
323 |
> |
vf = vflags; |
324 |
> |
ap = hp->sa; /* compute farthest along first row */ |
325 |
> |
for (j = 0; j < hp->ns-1; j++, vf++, ap++) |
326 |
> |
if (ap[0].d <= ap[1].d) |
327 |
> |
vf[0] |= 1<<VDB_X; |
328 |
|
else |
329 |
< |
vf[-1] |= 1<<VDB_X; |
330 |
< |
} |
329 |
> |
vf[1] |= 1<<VDB_x; |
330 |
> |
++vf; ++ap; |
331 |
|
/* flag subsequent rows */ |
332 |
|
for (i = 1; i < hp->ns; i++) { |
333 |
< |
double d2n = dist2(ambsam(hp,i,0).p, hp->rp->rop); |
334 |
< |
for (j = 0; j < hp->ns-1; j++) { |
340 |
< |
double d2 = d2n; |
341 |
< |
if (d2 >= dist2a[j]) /* row before */ |
333 |
> |
for (j = 0; j < hp->ns-1; j++, vf++, ap++) { |
334 |
> |
if (ap[0].d <= ap[-hp->ns].d) /* row before */ |
335 |
|
vf[0] |= 1<<VDB_y; |
336 |
|
else |
337 |
|
vf[-hp->ns] |= 1<<VDB_Y; |
338 |
< |
dist2a[j] = d2n; |
346 |
< |
if (d2 >= dist2a[j+1]) /* diagonal we care about */ |
338 |
> |
if (ap[0].d <= ap[1-hp->ns].d) /* diagonal we care about */ |
339 |
|
vf[0] |= 1<<VDB_Xy; |
340 |
|
else |
341 |
|
vf[1-hp->ns] |= 1<<VDB_xY; |
342 |
< |
d2n = dist2(ambsam(hp,i,j+1).p, hp->rp->rop); |
351 |
< |
if (d2 >= d2n) /* column after */ |
342 |
> |
if (ap[0].d <= ap[1].d) /* column after */ |
343 |
|
vf[0] |= 1<<VDB_X; |
344 |
|
else |
345 |
|
vf[1] |= 1<<VDB_x; |
355 |
– |
++vf; |
346 |
|
} |
347 |
< |
if (d2n >= dist2a[j]) /* final column edge */ |
347 |
> |
if (ap[0].d <= ap[-hp->ns].d) /* final column edge */ |
348 |
|
vf[0] |= 1<<VDB_y; |
349 |
|
else |
350 |
|
vf[-hp->ns] |= 1<<VDB_Y; |
351 |
< |
dist2a[j] = d2n; |
362 |
< |
++vf; |
351 |
> |
++vf; ++ap; |
352 |
|
} |
364 |
– |
free(dist2a); |
353 |
|
return(vflags); |
354 |
|
} |
355 |
|
|
537 |
|
|
538 |
|
|
539 |
|
/* Compute anisotropic radii and eigenvector directions */ |
540 |
< |
static int |
540 |
> |
static void |
541 |
|
eigenvectors(FVECT uv[2], float ra[2], FVECT hessian[3]) |
542 |
|
{ |
543 |
|
double hess2[2][2]; |
559 |
|
if (i == 1) /* double-root (circle) */ |
560 |
|
evalue[1] = evalue[0]; |
561 |
|
if (!i || ((evalue[0] = fabs(evalue[0])) <= FTINY*FTINY) | |
562 |
< |
((evalue[1] = fabs(evalue[1])) <= FTINY*FTINY) ) |
563 |
< |
error(INTERNAL, "bad eigenvalue calculation"); |
564 |
< |
|
562 |
> |
((evalue[1] = fabs(evalue[1])) <= FTINY*FTINY) ) { |
563 |
> |
ra[0] = ra[1] = maxarad; |
564 |
> |
return; |
565 |
> |
} |
566 |
|
if (evalue[0] > evalue[1]) { |
567 |
|
ra[0] = sqrt(sqrt(4.0/evalue[0])); |
568 |
|
ra[1] = sqrt(sqrt(4.0/evalue[1])); |
719 |
|
} |
720 |
|
|
721 |
|
|
722 |
+ |
/* Compute potential light leak direction flags for cache value */ |
723 |
+ |
static uint32 |
724 |
+ |
ambcorral(AMBHEMI *hp, FVECT uv[2], const double r0, const double r1) |
725 |
+ |
{ |
726 |
+ |
const double max_d = 1.0/(minarad*ambacc + 0.001); |
727 |
+ |
const double ang_res = 0.5*PI/(hp->ns-1); |
728 |
+ |
const double ang_step = ang_res/((int)(16/PI*ang_res) + (1+FTINY)); |
729 |
+ |
double avg_d = 0; |
730 |
+ |
uint32 flgs = 0; |
731 |
+ |
int i, j; |
732 |
+ |
/* don't bother for a few samples */ |
733 |
+ |
if (hp->ns < 12) |
734 |
+ |
return(0); |
735 |
+ |
/* check distances overhead */ |
736 |
+ |
for (i = hp->ns*3/4; i-- > hp->ns>>2; ) |
737 |
+ |
for (j = hp->ns*3/4; j-- > hp->ns>>2; ) |
738 |
+ |
avg_d += ambsam(hp,i,j).d; |
739 |
+ |
avg_d *= 4.0/(hp->ns*hp->ns); |
740 |
+ |
if (avg_d*r0 >= 1.0) /* ceiling too low for corral? */ |
741 |
+ |
return(0); |
742 |
+ |
if (avg_d >= max_d) /* insurance */ |
743 |
+ |
return(0); |
744 |
+ |
/* else circle around perimeter */ |
745 |
+ |
for (i = 0; i < hp->ns; i++) |
746 |
+ |
for (j = 0; j < hp->ns; j += !i|(i==hp->ns-1) ? 1 : hp->ns-1) { |
747 |
+ |
AMBSAMP *ap = &ambsam(hp,i,j); |
748 |
+ |
FVECT vec; |
749 |
+ |
double u, v; |
750 |
+ |
double ang, a1; |
751 |
+ |
int abp; |
752 |
+ |
if ((ap->d <= FTINY) | (ap->d >= max_d)) |
753 |
+ |
continue; /* too far or too near */ |
754 |
+ |
VSUB(vec, ap->p, hp->rp->rop); |
755 |
+ |
u = DOT(vec, uv[0]) * ap->d; |
756 |
+ |
v = DOT(vec, uv[1]) * ap->d; |
757 |
+ |
if ((r0*r0*u*u + r1*r1*v*v) * ap->d*ap->d <= 1.0) |
758 |
+ |
continue; /* occluder outside ellipse */ |
759 |
+ |
ang = atan2a(v, u); /* else set direction flags */ |
760 |
+ |
for (a1 = ang-.5*ang_res; a1 <= ang+.5*ang_res; a1 += ang_step) |
761 |
+ |
flgs |= 1L<<(int)(16/PI*(a1 + 2.*PI*(a1 < 0))); |
762 |
+ |
} |
763 |
+ |
return(flgs); |
764 |
+ |
} |
765 |
+ |
|
766 |
+ |
|
767 |
|
int |
768 |
|
doambient( /* compute ambient component */ |
769 |
|
COLOR rcol, /* input/output color */ |
772 |
|
FVECT uv[2], /* returned (optional) */ |
773 |
|
float ra[2], /* returned (optional) */ |
774 |
|
float pg[2], /* returned (optional) */ |
775 |
< |
float dg[2] /* returned (optional) */ |
775 |
> |
float dg[2], /* returned (optional) */ |
776 |
> |
uint32 *crlp /* returned (optional) */ |
777 |
|
) |
778 |
|
{ |
779 |
|
AMBHEMI *hp = inithemi(rcol, r, wt); |
793 |
|
pg[0] = pg[1] = 0.0; |
794 |
|
if (dg != NULL) |
795 |
|
dg[0] = dg[1] = 0.0; |
796 |
+ |
if (crlp != NULL) |
797 |
+ |
*crlp = 0; |
798 |
|
/* sample the hemisphere */ |
799 |
|
acol[0] = acol[1] = acol[2] = 0.0; |
800 |
|
cnt = 0; |
815 |
|
return(-1); /* return value w/o Hessian */ |
816 |
|
} |
817 |
|
cnt = ambssamp*wt + 0.5; /* perform super-sampling? */ |
818 |
< |
if (cnt > 0) |
818 |
> |
if (cnt > 8) |
819 |
|
ambsupersamp(acol, hp, cnt); |
820 |
|
copycolor(rcol, acol); /* final indirect irradiance/PI */ |
821 |
|
if ((ra == NULL) & (pg == NULL) & (dg == NULL)) { |
829 |
|
K = 1.0; |
830 |
|
pg = NULL; |
831 |
|
dg = NULL; |
832 |
+ |
crlp = NULL; |
833 |
|
} |
834 |
|
ap = hp->sa; /* relative Y channel from here on... */ |
835 |
|
for (i = hp->ns*hp->ns; i--; ap++) |
865 |
|
if (ra[0] > maxarad) |
866 |
|
ra[0] = maxarad; |
867 |
|
} |
868 |
+ |
/* flag encroached directions */ |
869 |
+ |
if ((wt >= 0.5-FTINY) & (crlp != NULL)) |
870 |
+ |
*crlp = ambcorral(hp, uv, ra[0]*ambacc, ra[1]*ambacc); |
871 |
|
if (pg != NULL) { /* cap gradient if necessary */ |
872 |
|
d = pg[0]*pg[0]*ra[0]*ra[0] + pg[1]*pg[1]*ra[1]*ra[1]; |
873 |
|
if (d > 1.0) { |