| 158 |
|
option may be used to further define |
| 159 |
|
a "bin number" within each object if finer resolution is needed, and |
| 160 |
|
this will be applied to a "%d" format in the output file |
| 161 |
< |
specification if present. |
| 161 |
> |
specification if present. |
| 162 |
> |
(The final integer will be offset incrementally |
| 163 |
> |
if the output is a RADIANCE picture and more than one modifier has |
| 164 |
> |
the same format specification.)\0 |
| 165 |
|
The actual bin number is computed at run time based on ray direction |
| 166 |
|
and surface intersection, as described below. |
| 167 |
|
The number of bins must be specified in advance with the |
| 211 |
|
with a |
| 212 |
|
.I \-p |
| 213 |
|
option, which contains a list of variable names and assigned values, separated |
| 214 |
< |
by commas or semicolons. |
| 214 |
> |
by commas, colons, or semicolons. |
| 215 |
|
The computed bin value will be |
| 216 |
|
rounded to the nearest whole number. |
| 217 |
|
(Negative bin values will be silently ignored.)\0 |
| 281 |
|
replaced by the contents of the given environment variable. |
| 282 |
|
A command argument beginning with an at sign ('@') is immediately |
| 283 |
|
replaced by the contents of the given file. |
| 284 |
+ |
.PP |
| 285 |
+ |
.I Rcontrib |
| 286 |
+ |
supports light source contributions from photon maps generated by |
| 287 |
+ |
.I mkpmap(1) |
| 288 |
+ |
with its |
| 289 |
+ |
.I -apC |
| 290 |
+ |
option. Enabling photon mapping is described in the |
| 291 |
+ |
.I rtrace |
| 292 |
+ |
man page along with its relevant settings. In photon mapping mode, |
| 293 |
+ |
.I rcontrib |
| 294 |
+ |
only supports contributions from light sources, not arbitrary modifiers. |
| 295 |
+ |
The |
| 296 |
+ |
.I -b |
| 297 |
+ |
option is supported along with its associated ray variables, as |
| 298 |
+ |
discussed above. Ray coefficients are also supported via the |
| 299 |
+ |
.I \-V- |
| 300 |
+ |
option. Using fewer photons than there are light sources for the photon |
| 301 |
+ |
density estimates results in omitted contributions, thus the bandwidth |
| 302 |
+ |
is clamped accordingly and a warning is issued. |
| 303 |
|
.SH EXAMPLES |
| 304 |
|
To compute the proportional contributions from sources modified |
| 305 |
|
by "light1" vs. "light2" on a set of illuminance values: |
| 322 |
|
.IP "" .2i |
| 323 |
|
rcontrib \-I+ \-f tregenza.cal \-b tbin \-bn Ntbins \-o sky.dat \-m skyglow |
| 324 |
|
\-b 0 \-o ground.dat \-m groundglow @render.opt scene.oct < test.dat |
| 325 |
+ |
.PP |
| 326 |
+ |
To perform an annual simulation of 365 daily sun positions in photon mapping |
| 327 |
+ |
mode: |
| 328 |
+ |
.IP "" .2i |
| 329 |
+ |
rcontrib \-I+ \-h \-V \-fo \-o c_%s.dat \-M lights \-ap contrib.pm 365 |
| 330 |
+ |
scene.oct < test.dat, |
| 331 |
|
.SH ENVIRONMENT |
| 332 |
|
RAYPATH path to search for \-f and \-M files |
| 333 |
+ |
.SH BUGS |
| 334 |
+ |
We do not currently compute contributions or coefficients properly |
| 335 |
+ |
in scenes with participating media. |
| 336 |
+ |
A single warning will be issued if a scattering or absorbing medium |
| 337 |
+ |
is detected. |
| 338 |
|
.SH AUTHOR |
| 339 |
|
Greg Ward |
| 340 |
|
.SH "SEE ALSO" |
| 341 |
< |
cnt(1), genklemsamp(1), getinfo(1), pcomb(1), pfilt(1), ra_rgbe(1), |
| 342 |
< |
rcalc(1), rpict(1), rsensor(1), rtrace(1), total(1), vwrays(1), ximage(1) |
| 341 |
> |
cnt(1), genklemsamp(1), getinfo(1), mkpmap(1), pcomb(1), pfilt(1), |
| 342 |
> |
ra_rgbe(1), rcalc(1), rfluxmtx(1), rmtxop(1), rpict(1), rsensor(1), |
| 343 |
> |
rtrace(1), total(1), vwrays(1), ximage(1) |
| 344 |
> |
|
