| 61 |
|
If the |
| 62 |
|
.I \-n |
| 63 |
|
option is specified with a value greater than 1, multiple |
| 64 |
– |
.I rtrace |
| 64 |
|
processes will be used to accelerate computation on a shared |
| 65 |
|
memory machine. |
| 66 |
|
Note that there is no benefit to using more processes |
| 128 |
|
systems, such as luminaires, light pipes, and shading devices. |
| 129 |
|
.PP |
| 130 |
|
.I Rcontrib |
| 131 |
< |
calls |
| 132 |
< |
.I rtrace(1) |
| 134 |
< |
with the \-oTW (or \-oTV) option to calculate the daughter ray |
| 135 |
< |
contributions for each input ray, and the output tallies |
| 136 |
< |
are sent to one or more destinations according to the given |
| 131 |
> |
sends the accumulated rays tallies |
| 132 |
> |
to one or more destinations according to the given |
| 133 |
|
.I \-o |
| 134 |
|
specification. |
| 135 |
|
If a destination begins with an exclamation mark ('!'), then |
| 158 |
|
specification if present. |
| 159 |
|
The actual bin number is computed at run time based on ray direction |
| 160 |
|
and surface intersection, as described below. |
| 161 |
< |
If the number of bins is known in advance, it should be specified with the |
| 161 |
> |
The number of bins must be specified in advance with the |
| 162 |
|
.I \-bn |
| 163 |
|
option, and this is critical for output files containing multiple values |
| 164 |
|
per record. |
| 192 |
|
.I \-b |
| 193 |
|
expression is defined for a particular modifier, |
| 194 |
|
the bin number will be evaluated at run time for each |
| 195 |
< |
ray contribution from |
| 200 |
< |
.I rtrace. |
| 195 |
> |
ray contribution. |
| 196 |
|
Specifically, each ray's world intersection point will be assigned to |
| 197 |
|
the variables Px, Py, and Pz, and the normalized ray direction |
| 198 |
|
will be assigned to Dx, Dy, and Dz. |
