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 # 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