| 47 |
|
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
| 48 |
|
|
| 49 |
|
|
| 50 |
+ |
setambres(ar) /* set ambient resolution */ |
| 51 |
+ |
int ar; |
| 52 |
+ |
{ |
| 53 |
+ |
/* set min & max radii */ |
| 54 |
+ |
if (ar <= 0) { |
| 55 |
+ |
minarad = 0.0; |
| 56 |
+ |
maxarad = thescene.cusize / 2.0; |
| 57 |
+ |
} else { |
| 58 |
+ |
minarad = thescene.cusize / ar; |
| 59 |
+ |
maxarad = 16.0 * minarad; /* heuristic */ |
| 60 |
+ |
if (maxarad > thescene.cusize / 2.0) |
| 61 |
+ |
maxarad = thescene.cusize / 2.0; |
| 62 |
+ |
} |
| 63 |
+ |
if (maxarad <= FTINY) |
| 64 |
+ |
maxarad = .001; |
| 65 |
+ |
} |
| 66 |
+ |
|
| 67 |
+ |
|
| 68 |
|
setambient(afile) /* initialize calculation */ |
| 69 |
|
char *afile; |
| 70 |
|
{ |
| 71 |
|
long ftell(); |
| 72 |
|
AMBVAL amb; |
| 73 |
< |
|
| 74 |
< |
maxarad = thescene.cusize / 2.0; /* maximum radius */ |
| 75 |
< |
/* minimum radius */ |
| 58 |
< |
minarad = ambres > 0 ? thescene.cusize/ambres : 0.0; |
| 59 |
< |
|
| 60 |
< |
/* open ambient file */ |
| 73 |
> |
/* init ambient limits */ |
| 74 |
> |
setambres(ambres); |
| 75 |
> |
/* open ambient file */ |
| 76 |
|
if (afile != NULL) |
| 77 |
|
if ((ambfp = fopen(afile, "r+")) != NULL) { |
| 78 |
|
while (fread((char *)&amb,sizeof(AMBVAL),1,ambfp) == 1) |
| 207 |
|
* Jittering final test reduces image artifacts. |
| 208 |
|
*/ |
| 209 |
|
wt = sqrt(e1) + sqrt(e2); |
| 210 |
< |
wt *= .9 + .2*frandom(); |
| 210 |
> |
wt *= .9 + .2*urand(9015+samplendx); |
| 211 |
|
if (wt > ambacc) |
| 212 |
|
continue; |
| 213 |
|
if (wt <= 1e-3) |
