| 57 |
|
illumination and is intended for debugging and validation of photon emission |
| 58 |
|
from the light sources, as the quality is too low for actual rendering. |
| 59 |
|
|
| 60 |
< |
.IP "\fB\-apC \fIfile nphotons \fB(EXPERIMENTAL)\fR" |
| 60 |
> |
.IP "\fB\-apC \fIfile nphotons\fR" |
| 61 |
|
Generate a contribution photon map containing approximately |
| 62 |
|
\fInphotons\fR photons, and output to file \fIfile\fR. This may then be |
| 63 |
|
used by \fIrcontrib(1)\fR to compute light source contributions. |
| 148 |
|
surface therefore does not affect the light transport and simply acts as an |
| 149 |
|
invisible photon receiver. This is useful when photon irradiance is to be |
| 150 |
|
evaluated at points which do not lie on regular geometry, e.g. at workplane |
| 151 |
< |
height with \firtrace\fR's \fB-I\fR option. Without this workaround, |
| 151 |
> |
height with \fIrtrace\fR's \fB-I\fR option. Without this workaround, |
| 152 |
|
photons would be collected from parallel but distant planes, leading to |
| 153 |
|
underestimation. Note that photons are only deposited when incident from |
| 154 |
|
the front side of the sensor surface, i.e. when entering the |
| 190 |
|
inadvertently destroying the results of potentially lengthy photon |
| 191 |
|
mapping runs. |
| 192 |
|
|
| 193 |
– |
.IP "\fB\-i \fIinc\fR" |
| 194 |
– |
Photon heap size increment; the photon heap is enlarged by this amount |
| 195 |
– |
when storage overflows during photon distribution. No need to fiddle |
| 196 |
– |
with this under ordinary circumstances. |
| 197 |
– |
|
| 193 |
|
.IP "\fB\-ma \fIralb galb balb\fR" |
| 194 |
|
Set the global scattering albedo for participating media in conjunction |
| 195 |
|
with the \fB\-apv\fR option. See \fIrpict(1)\fR for details. |
| 205 |
|
.IP "\fB\-n \fInproc\fR" |
| 206 |
|
Use \fInproc\fR processes for parallel photon distribution. There is no |
| 207 |
|
benefit in specifying more than the number of physical CPU cores available. |
| 208 |
+ |
This option is currently not available on Windows. |
| 209 |
|
|
| 210 |
|
.IP "\fB\-t \fIinterval\fR" |
| 211 |
|
Output a progress report every \fIinterval\fR seconds. This includes |
| 281 |
|
Generate a contribution photon map containing 200000 photons suitable for |
| 282 |
|
obtaining light source contributions with \fIrcontrib(1)\fR: |
| 283 |
|
.IP |
| 284 |
< |
mkpmap \-apl bonzo-contrib.gpm 200k bonzo.oct |
| 284 |
> |
mkpmap \-apC bonzo-contrib.gpm 200k bonzo.oct |
| 285 |
|
|
| 286 |
|
.SH BUGS |
| 287 |
|
The focus of a spotlight source, as defined by the length of its direction |
