| 1422 |
|
|
| 1423 |
|
Added -oM option to rtrace to report material (rather than modifier) |
| 1424 |
|
for cases where actual material is aliased or further up modifier chain. |
| 1425 |
+ |
|
| 1426 |
+ |
Rearranged the way ray contributions are computed so that it might be |
| 1427 |
+ |
possible to use rtrace to derive daylight coefficients and optical |
| 1428 |
+ |
transfer functions. The new -oTW option of rtrace produces color |
| 1429 |
+ |
contribution weights for each ray, which combined with the -ti (or -tI) |
| 1430 |
+ |
option permits the contribution of selected surfaces or sources to |
| 1431 |
+ |
be determined. Using the -oTW option, one should also specify |
| 1432 |
+ |
options "-dt 0 -aa 0 -as 0" for optimal results. In particular, |
| 1433 |
+ |
one cannot expect reasonable tallies with -ab >= 1 and irradiance |
| 1434 |
+ |
caching on (-aa > 0). |
| 1435 |
+ |
|
| 1436 |
+ |
The same code modifications included a change to the indirect computation |
| 1437 |
+ |
with caching switched off (-aa 0). Whereas before, the number of secondary |
| 1438 |
+ |
rays after the first bounce were half of the previous generation, they are |
| 1439 |
+ |
now determined by the surface reflectance, making for a better and faster |
| 1440 |
+ |
calculation. It should now be possible to compute many bounces with -aa 0, |
| 1441 |
+ |
which used to be prohibitively expensive. |
