Determines if the sky illumination is computed at render time.
| Type: | Integer | 
| Saved in: | Drawing | 
| Initial value: | 0 | 
This has no impact on the viewport illumination or the background. It only makes the sky available as a gathered light source for rendering.
| 
 0  | 
Sky off | 
| 
 1  | 
 Sky background  | 
| 
 2  | 
 Sky background and illumination  |