| 365 |
|
.TP |
| 366 |
|
.BR -bv |
| 367 |
|
Boolean switch for back face visibility. |
| 368 |
< |
With this switch off, back faces of opaque objects will be invisible |
| 369 |
< |
to all rays. |
| 368 |
> |
With this switch off, back faces of all objects will be invisible |
| 369 |
> |
to view rays. |
| 370 |
|
This is dangerous unless the model was constructed such that |
| 371 |
< |
all surface normals on opaque objects face outward. |
| 371 |
> |
all surface normals face outward. |
| 372 |
|
Although turning off back face visibility does not save much |
| 373 |
|
computation time under most circumstances, it may be useful as a |
| 374 |
|
tool for scene debugging, or for seeing through one-sided walls from |
| 375 |
|
the outside. |
| 376 |
– |
This option has no effect on transparent or translucent materials. |
| 376 |
|
.TP |
| 377 |
|
.BI -av " red grn blu" |
| 378 |
|
Set the ambient value to a radiance of |
