Click Visualize tabLights panelLights In Model. Find
In the Lights in Model palette, select the distant light and right-click. Choose Properties.
In the Properties palette, under Geometry, use one of the following methods to change a value after you click the property to modify:
Enter a value in the field.
Click the Calculator button to use the QuickCalc dialog box.
Click the Select in Drawing button and specify a new point. The line displayed in the drawing area represents the vector.
When you change one of the 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.