$RCWAsourceposition

$RCWAsourceposition required setting tag the layers you want to put the light sources. This number needs to be set in the beginning of input file. It relates to $RCWAsourcelength.

Example

$RCWAsourceposition 

3 - layer3
2 - region2 at layer3

The $RCWAsourceposition setting in GUI interface is here
1. Press Set up the multiple light sources.
2. Fill in the field for Layer and Region as needed!

$RCWAsourcelength