| 78 |
|
hlist[1] = j; |
| 79 |
|
hlist[2] = i; |
| 80 |
|
multisamp(spt, 2, urand(ilhash(hlist,3)+n)); |
| 81 |
< |
if (!n) { /* avoid border samples for n==0 */ |
| 81 |
> |
/* avoid coincident samples */ |
| 82 |
> |
if (!n && (0 < i) & (i < hp->ns-1) && |
| 83 |
> |
(0 < j) & (j < hp->ns-1)) { |
| 84 |
|
if ((spt[0] < 0.1) | (spt[0] >= 0.9)) |
| 85 |
|
spt[0] = 0.1 + 0.8*frandom(); |
| 86 |
|
if ((spt[1] < 0.1) | (spt[1] >= 0.9)) |
| 180 |
|
float *earr = getambdiffs(hp); |
| 181 |
|
double e2rem = 0; |
| 182 |
|
AMBSAMP *ap; |
| 181 |
– |
RAY ar; |
| 183 |
|
float *ep; |
| 184 |
|
int i, j, n, nss; |
| 185 |
|
|
| 235 |
|
d = 1.0/(n*n); |
| 236 |
|
scalecolor(hp->acoef, d); |
| 237 |
|
/* make tangent plane axes */ |
| 238 |
< |
hp->uy[0] = 0.5 - frandom(); |
| 238 |
< |
hp->uy[1] = 0.5 - frandom(); |
| 239 |
< |
hp->uy[2] = 0.5 - frandom(); |
| 240 |
< |
for (i = 3; i--; ) |
| 241 |
< |
if ((-0.6 < r->ron[i]) & (r->ron[i] < 0.6)) |
| 242 |
< |
break; |
| 243 |
< |
if (i < 0) |
| 238 |
> |
if (!getperpendicular(hp->ux, r->ron)) |
| 239 |
|
error(CONSISTENCY, "bad ray direction in samp_hemi"); |
| 245 |
– |
hp->uy[i] = 1.0; |
| 246 |
– |
VCROSS(hp->ux, hp->uy, r->ron); |
| 247 |
– |
normalize(hp->ux); |
| 240 |
|
VCROSS(hp->uy, r->ron, hp->ux); |
| 241 |
|
/* sample divisions */ |
| 242 |
|
for (i = hp->ns; i--; ) |
| 600 |
|
ambcorral(AMBHEMI *hp, FVECT uv[2], const double r0, const double r1) |
| 601 |
|
{ |
| 602 |
|
const double max_d = 1.0/(minarad*ambacc + 0.001); |
| 603 |
< |
const double ang_res = 0.5*PI/(hp->ns-1); |
| 604 |
< |
const double ang_step = ang_res/((int)(16/PI*ang_res) + (1+FTINY)); |
| 603 |
> |
const double ang_res = 0.5*PI/hp->ns; |
| 604 |
> |
const double ang_step = ang_res/((int)(16/PI*ang_res) + 1.01); |
| 605 |
|
double avg_d = 0; |
| 606 |
|
uint32 flgs = 0; |
| 607 |
|
FVECT vec; |
| 632 |
|
if ((r0*r0*u*u + r1*r1*v*v) * ap->d*ap->d <= u*u + v*v) |
| 633 |
|
continue; /* occluder outside ellipse */ |
| 634 |
|
ang = atan2a(v, u); /* else set direction flags */ |
| 635 |
< |
for (a1 = ang-.5*ang_res; a1 <= ang+.5*ang_res; a1 += ang_step) |
| 635 |
> |
for (a1 = ang-ang_res; a1 <= ang+ang_res; a1 += ang_step) |
| 636 |
|
flgs |= 1L<<(int)(16/PI*(a1 + 2.*PI*(a1 < 0))); |
| 637 |
|
} |
| 638 |
|
/* add low-angle incident (< 20deg) */ |
| 685 |
|
return(0); |
| 686 |
|
|
| 687 |
|
if ((ra == NULL) & (pg == NULL) & (dg == NULL) || |
| 688 |
< |
(hp->sampOK < 0) | (hp->ns < 4)) { |
| 688 |
> |
(hp->sampOK < 0) | (hp->ns < 6)) { |
| 689 |
|
free(hp); /* Hessian not requested/possible */ |
| 690 |
|
return(-1); /* value-only return value */ |
| 691 |
|
} |
