| 278 |
|
/* compute foreground and background */ |
| 279 |
|
foremat = backmat = 0; |
| 280 |
|
/* foreground */ |
| 281 |
< |
copystruct(&fr, r); |
| 281 |
> |
fr = *r; |
| 282 |
|
if (coef > FTINY) |
| 283 |
|
foremat = rayshade(&fr, fore); |
| 284 |
|
/* background */ |
| 285 |
< |
copystruct(&br, r); |
| 285 |
> |
br = *r; |
| 286 |
|
if (coef < 1.0-FTINY) |
| 287 |
|
backmat = rayshade(&br, back); |
| 288 |
|
/* check for transparency */ |
| 289 |
< |
if (backmat ^ foremat) |
| 289 |
> |
if (backmat ^ foremat) { |
| 290 |
|
if (backmat && coef > FTINY) |
| 291 |
|
raytrans(&fr); |
| 292 |
|
else if (foremat && coef < 1.0-FTINY) |
| 293 |
|
raytrans(&br); |
| 294 |
+ |
} |
| 295 |
|
/* mix perturbations */ |
| 296 |
|
for (i = 0; i < 3; i++) |
| 297 |
|
r->pert[i] = coef*fr.pert[i] + (1.0-coef)*br.pert[i]; |
