| 178 |
|
This option is especially useful in |
| 179 |
|
conjunction with ximage(1) for computing illuminance at scene points. |
| 180 |
|
.TP |
| 181 |
+ |
.BR \-R |
| 182 |
+ |
Boolean switch to control random sampling. |
| 183 |
+ |
When "off", a low-discrepancy sequence is used, which reduces |
| 184 |
+ |
variance but can result in a brushed appearance in specular highlights. |
| 185 |
+ |
When "on", pure Monte Carlo sampling is used in all calculations. |
| 186 |
+ |
.TP |
| 187 |
|
.BR \-I |
| 188 |
|
Boolean switch to compute irradiance rather than radiance, |
| 189 |
|
with the input origin and direction interpreted instead |
