| # | Line 54 | Line 54 | option may be given. | |
|---|---|---|
| 54 | To turn off backward components, use the | |
| 55 | .I \-backward | |
| 56 | option. | |
| 57 | < | Computing both components takes about twice as long as one component. |
| 57 | > | Computing both components takes about twice as long as one component, but |
| 58 | > | is recommended when rays will be impinging from either side. |
| 59 | .PP | |
| 60 | The geometry must fit a rectangular profile, whose width is along the X-axis, | |
| 61 | height is in the Y-axis, and depth is in the Z-axis. | |
| – | Removed lines |
| + | Added lines |
| < | Changed lines |
| > | Changed lines |