| 30 |
|
If the direction vector is (0,0,0), a bogus record |
| 31 |
|
is printed and the output is flushed if the |
| 32 |
|
.I -x |
| 33 |
< |
value is unset or zero. |
| 33 |
> |
value is one or zero. |
| 34 |
|
(See the notes on this option below.)\0 |
| 35 |
|
This may be useful for programs that run |
| 36 |
|
.I rtrace |
| 199 |
|
.I res. |
| 200 |
|
The output will be flushed after every |
| 201 |
|
.I res |
| 202 |
< |
input rays. |
| 202 |
> |
input rays if |
| 203 |
> |
.I \-y |
| 204 |
> |
is set to zero. |
| 205 |
> |
A value of one means that every ray will be flushed, whatever |
| 206 |
> |
the setting of |
| 207 |
> |
.I \-y. |
| 208 |
|
A value of zero means that no output flushing will take place. |
| 209 |
|
.TP |
| 210 |
|
.BI -y \ res |
| 239 |
|
Execute in parallel on |
| 240 |
|
.I nproc |
| 241 |
|
local processes. |
| 242 |
< |
This option is incompatible with |
| 242 |
> |
This option is incompatible with the |
| 243 |
|
.I \-P |
| 244 |
|
and |
| 245 |
|
.I \-PP, |
| 246 |
< |
and is not currently supported with the |
| 242 |
< |
.I \-I |
| 243 |
< |
option. |
| 246 |
> |
options. |
| 247 |
|
Multiple processes also do not work properly with ray tree output |
| 248 |
|
using any of the |
| 249 |
|
.I \-o*t* |
| 335 |
|
.I \-i |
| 336 |
|
option. |
| 337 |
|
.TP |
| 338 |
< |
.BI -sj \ frac |
| 339 |
< |
Set the specular sampling jitter to |
| 340 |
< |
.I frac. |
| 341 |
< |
This is the degree to which the highlights are sampled |
| 342 |
< |
for rough specular materials. |
| 343 |
< |
A value of one means that all highlights will be fully sampled |
| 344 |
< |
using distributed ray tracing. |
| 338 |
> |
.BI -ss \ samp |
| 339 |
> |
Set the specular sampling to |
| 340 |
> |
.I samp. |
| 341 |
> |
For values less than 1, this is the degree to which the highlights |
| 342 |
> |
are sampled for rough specular materials. |
| 343 |
> |
A value greater than one causes multiple ray samples to be sent |
| 344 |
> |
to reduce noise at a commmesurate cost. |
| 345 |
|
A value of zero means that no jittering will take place, and all |
| 346 |
|
reflections will appear sharp even when they should be diffuse. |
| 347 |
|
.TP |
| 361 |
|
.TP |
| 362 |
|
.BR -bv |
| 363 |
|
Boolean switch for back face visibility. |
| 364 |
< |
With this switch off, back faces of opaque objects will be invisible |
| 365 |
< |
to all rays. |
| 364 |
> |
With this switch off, back faces of all objects will be invisible |
| 365 |
> |
to view rays. |
| 366 |
|
This is dangerous unless the model was constructed such that |
| 367 |
< |
all surface normals on opaque objects face outward. |
| 367 |
> |
all surface normals face outward. |
| 368 |
|
Although turning off back face visibility does not save much |
| 369 |
|
computation time under most circumstances, it may be useful as a |
| 370 |
|
tool for scene debugging, or for seeing through one-sided walls from |
| 371 |
|
the outside. |
| 369 |
– |
This option has no effect on transparent or translucent materials. |
| 372 |
|
.TP |
| 373 |
|
.BI -av " red grn blu" |
| 374 |
|
Set the ambient value to a radiance of |
| 547 |
|
.TP |
| 548 |
|
.BI -lr \ N |
| 549 |
|
Limit reflections to a maximum of |
| 550 |
< |
.I N. |
| 550 |
> |
.I N, |
| 551 |
> |
if N is a positive integer. |
| 552 |
|
If |
| 553 |
|
.I N |
| 554 |
|
is zero or negative, then Russian roulette is used for ray |
| 556 |
|
.I -lw |
| 557 |
|
setting (below) must be positive. |
| 558 |
|
If N is a negative integer, then this sets the upper limit |
| 559 |
< |
of reflections past which Russian roulette will not be used. |
| 559 |
> |
of reflections past which Russian roulette will be used. |
| 560 |
|
In scenes with dielectrics and total internal reflection, |
| 561 |
|
a setting of 0 (no limit) may cause a stack overflow. |
| 562 |
|
.TP |
| 669 |
|
Greg Ward |
| 670 |
|
.SH "SEE ALSO" |
| 671 |
|
getinfo(1), lookamb(1), oconv(1), pfilt(1), pinterp(1), |
| 672 |
< |
pvalue(1), rpict(1), rtcontrib(1), rvu(1), vwrays(1), ximage(1) |
| 672 |
> |
pvalue(1), rpict(1), rcontrib(1), rvu(1), vwrays(1), ximage(1) |
