| 45 |
|
.B octree |
| 46 |
|
.br |
| 47 |
|
.B "rcontrib [ options ] \-defaults" |
| 48 |
+ |
.br |
| 49 |
+ |
.B "rcontrib \-features [feat1 ..]" |
| 50 |
|
.SH DESCRIPTION |
| 51 |
|
.I Rcontrib |
| 52 |
|
computes ray coefficients |
| 123 |
|
.I \-c |
| 124 |
|
set to zero. |
| 125 |
|
.PP |
| 126 |
+ |
Output flushing at fixed intervals may be enabled with the |
| 127 |
+ |
.I \-x |
| 128 |
+ |
option, which specifies the number of records |
| 129 |
+ |
(-c accumulations) before each flush. |
| 130 |
+ |
If the |
| 131 |
+ |
.I \-y |
| 132 |
+ |
option is also set, then periodic flushing is disabled and the |
| 133 |
+ |
output size for an RGB image is the taken from the x and y dimensions. |
| 134 |
+ |
In lieu of periodic flushing, a flush may be forced as mentioned above |
| 135 |
+ |
by sending a sample with a zero direction vector, although you |
| 136 |
+ |
must still send a full record of rays before output occurs. |
| 137 |
+ |
.PP |
| 138 |
|
If progress reports are desired, the |
| 139 |
|
.I \-t |
| 140 |
|
option specifies a time interval in seconds for reports sent to |
| 141 |
|
standard error. |
| 142 |
+ |
This requires that the number of input samples is known, meaning a |
| 143 |
+ |
.I \-y |
| 144 |
+ |
parameter has been specified. |
| 145 |
|
.PP |
| 146 |
|
The output of |
| 147 |
|
.I rcontrib |
| 326 |
|
is clamped accordingly and a warning is issued. |
| 327 |
|
.SH EXAMPLES |
| 328 |
|
To compute the proportional contributions from sources modified |
| 329 |
< |
by "light1" vs. "light2" on a set of illuminance values: |
| 329 |
> |
by "light1" vs. "light2" on a set of irradiance values: |
| 330 |
|
.IP "" .2i |
| 331 |
|
rcontrib \-I+ @render.opt \-o c_%s.dat \-m light1 \-m light2 scene.oct < test.dat |
| 332 |
|
.PP |
| 342 |
|
.IP "" .2i |
| 343 |
|
pcomb \-c 100 90 75 c_light1.hdr \-c 50 55 57 c_light2.hdr > combined.hdr |
| 344 |
|
.PP |
| 345 |
< |
To compute an array of illuminance contributions according to a Tregenza sky: |
| 345 |
> |
To compute an array of irradiance contributions according to a Tregenza sky: |
| 346 |
|
.IP "" .2i |
| 347 |
|
rcontrib \-I+ \-f tregenza.cal \-b tbin \-bn Ntbins \-o sky.dat \-m skyglow |
| 348 |
|
\-b 0 \-o ground.dat \-m groundglow @render.opt scene.oct < test.dat |
