Calculate Lights
To calculate scene lights and shadows, select the Tools>Calculate
Lights menu. The Light Settings dialog
will allow you to adjust various parameters before performing the
operation.
Press the OK button to perform the operation. If no scene lights are present, the entire
scene will be colored the ambient lighting color. Caution should be taken when using a smaller lightmap
size. If a surface in the scene is
larger than the lightmap area, the surface may only be partially lit.