| 408 |
|
This is the maximum number of diffuse bounces computed by the indirect |
| 409 |
|
calculation. A value of zero implies no indirect calculation. |
| 410 |
|
.IP |
| 411 |
< |
In photon mapping mode (see |
| 411 |
> |
This value defaults to 1 in photon mapping mode (see |
| 412 |
|
.I -ap |
| 413 |
< |
below), a positive value implies that global photon irradiance is |
| 414 |
< |
always computed via |
| 413 |
> |
below), implying that global photon irradiance is always computed via |
| 414 |
|
.I one |
| 415 |
< |
ambient bounce. A negative value enables a preview mode that directly |
| 416 |
< |
visualises the irradiance from the global photon map without any ambient |
| 417 |
< |
bounces. |
| 415 |
> |
ambient bounce; this behaviour applies to any positive number of ambient |
| 416 |
> |
bounces, regardless of the actual value specified. A negative value enables |
| 417 |
> |
a preview mode that directly visualises the irradiance from the global |
| 418 |
> |
photon map without any ambient bounces. |
| 419 |
|
.TP |
| 420 |
|
.BI -ar \ res |
| 421 |
|
Set the ambient resolution to |
| 560 |
|
for debugging and validation of photon emission. |
| 561 |
|
.TP |
| 562 |
|
.BI -am " frac" |
| 563 |
< |
Coefficient for maximum search radius for photon map lookups. The search |
| 564 |
< |
radius is automatically determined based on the average photon distance to the |
| 565 |
< |
distribution's centre of gravity, and scaled by this coefficient. Increase this |
| 566 |
< |
value if multiple warnings about short photon lookups are issued. |
| 563 |
> |
Maximum search radius for photon map lookups. Without this option, an |
| 564 |
> |
initial maximum search radius is estimated for each photon map from the |
| 565 |
> |
average photon distance to the distribution's centre of gravity. It is then |
| 566 |
> |
adapted to the photon density in subsequent lookups. This option imposes a |
| 567 |
> |
global fixed maximum search radius for |
| 568 |
> |
.I all |
| 569 |
> |
photon maps, thus defeating the automatic adaptation. It is useful when |
| 570 |
> |
multiple warnings about short photon lookups are issued. Note that this |
| 571 |
> |
option does not conflict with the bandwidth specified with the |
| 572 |
> |
.I \-ap |
| 573 |
> |
option; the number of photons found will not exceed the latter, but may be |
| 574 |
> |
lower if the maximum search radius contains fewer photons, thus resulting in |
| 575 |
> |
short lookups. Setting this radius too large, on the other hand, may |
| 576 |
> |
degrade performance. |
| 577 |
|
.TP |
| 578 |
|
.BI -me " rext gext bext" |
| 579 |
|
Set the global medium extinction coefficient to the indicated color, |
| 886 |
|
.SH "SEE ALSO" |
| 887 |
|
getinfo(1), lookamb(1), mkpmap(1), oconv(1), pdfblur(1), pfilt(1), |
| 888 |
|
pinterp(1), pmblur(1), printf(3), ra_rgbe(1), rad(1), rtrace(1), rvu(1) |
| 879 |
– |
|
