- Click Render tab
Lights panel Lighting Units drop-down Generic Lighting Units. 
No lighting units are used and standard (generic) lighting is enabled.
- Click Render tab Lights panel Lights In Model.At the Command prompt, enter lightlist
- In the Lights in Model palette, select the distant light.
- Click View tab Palettes panel Properties.
- In the Properties palette, under Geometry, use one of the following methods to change a value:
- Enter a value in a cell.
- Click the Calculator button to use QuickCalc.
- Click the Select in Drawing button and specify From and To points. The line displayed in the drawing represents the vector.
When you change From Vector and To Vector values, the Source Vector values are updated. When you change Source Vector values directly, the From Vector and To Vector values are updated.