ExtendedActivateSourceLayer Last update: 17.07.2025 Description Activates one source of an extended map. In case of error, returns -1 if: no source in the map iSource >= number of sources in the map iSource 0 Syntax object.ExtendedActivateSourceLayer(int iSource, bool bActive) As Short object: Virtual Photometric Lab or Human Vision Lab object iSource: index of the source to consider bActive: true to activate the source, false to deactivate it