| 310 |
|
specification will be calculated. |
| 311 |
|
.TP |
| 312 |
|
.BI -dr \ N |
| 313 |
< |
Set the number of relays for secondary sources to |
| 313 |
> |
Set the number of relays for virtual sources to |
| 314 |
|
.I N. |
| 315 |
< |
A value of 0 means that secondary sources will be ignored. |
| 315 |
> |
A value of 0 means that virtual sources will be ignored. |
| 316 |
|
A value of 1 means that sources will be made into first generation |
| 317 |
< |
secondary sources; a value of 2 means that first generation |
| 318 |
< |
secondary sources will also be made into second generation secondary |
| 317 |
> |
virtual sources; a value of 2 means that first generation |
| 318 |
> |
virtual sources will also be made into second generation virtual |
| 319 |
|
sources, and so on. |
| 320 |
|
.TP |
| 321 |
|
.BI -dp \ D |
| 322 |
< |
Set the secondary source presampling density to D. |
| 322 |
> |
Set the virtual source presampling density to D. |
| 323 |
|
This is the number of samples per steradian |
| 324 |
|
that will be used to determine ahead of time whether or not |
| 325 |
|
it is worth following shadow rays through all the reflections and/or |
| 326 |
< |
transmissions associated with a secondary source path. |
| 327 |
< |
A value of 0 means that the full secondary source path will always |
| 326 |
> |
transmissions associated with a virtual source path. |
| 327 |
> |
A value of 0 means that the full virtual source path will always |
| 328 |
|
be tested for shadows if it is tested at all. |
| 329 |
|
.TP |
| 330 |
|
.BR \-dv |
| 439 |
|
Set the ambient accuracy to |
| 440 |
|
.I acc. |
| 441 |
|
This value will approximately equal the error |
| 442 |
< |
from indirect illuminance interpolation. |
| 442 |
> |
from indirect irradiance interpolation. |
| 443 |
|
A value of zero implies no interpolation. |
| 444 |
|
.TP |
| 445 |
|
.BI -ad \ N |
| 446 |
|
Set the number of ambient divisions to |
| 447 |
|
.I N. |
| 448 |
|
The error in the Monte Carlo calculation of indirect |
| 449 |
< |
illuminance will be inversely proportional to the square |
| 449 |
> |
irradiance will be inversely proportional to the square |
| 450 |
|
root of this number. |
| 451 |
|
A value of zero implies no indirect calculation. |
| 452 |
|
.TP |
| 459 |
|
.BI -af \ fname |
| 460 |
|
Set the ambient file to |
| 461 |
|
.I fname. |
| 462 |
< |
This is where indirect illuminance will be stored and retrieved. |
| 463 |
< |
Normally, indirect illuminance values are kept in memory and |
| 462 |
> |
This is where indirect irradiance will be stored and retrieved. |
| 463 |
> |
Normally, indirect irradiance values are kept in memory and |
| 464 |
|
lost when the program finishes or dies. |
| 465 |
< |
By using a file, different invocations can share illuminance |
| 465 |
> |
By using a file, different invocations can share irradiance |
| 466 |
|
values, saving time in the computation. |
| 467 |
|
Also, by creating an ambient file during a low-resolution rendering, |
| 468 |
|
better results can be obtained in a second high-resolution pass. |
| 886 |
|
.PP |
| 887 |
|
rpict \-S 1 \-o frame%02d.hdr scene.oct < keyframes.vf |
| 888 |
|
.PP |
| 889 |
< |
To render ambient illuminance in photon mapping mode from a global photon |
| 889 |
> |
To render ambient irradiance in photon mapping mode from a global photon |
| 890 |
|
map global.pm via one ambient bounce, and from a caustic photon map |
| 891 |
|
caustic.pm: |
| 892 |
|
.IP "" .2i |
