Issues with Global Lighting Mask (hard to shape it)

[Jesternario]

Is it possible to use free shaping of the masking for global lights? I can only put down square masks to block off building from sunlight and similar, and this becomes a problem if a building is diagonal.

[LordEntrails]

Yes it's possible. Just like with pointers, you can get different functions with the modifier keys; ALT, CTRL, SHIFT. (What you want is done using the ALT key)
See the wiki for details: Working with Images as the GM - Fantasy Grounds Customer Portal - Fantasy Grounds (https://fantasygroundsunity.atlassian.net/wiki/spaces/FGCP/pages/996640166/Working+with+Images+as+the+GM#[mediaInline]-Global-LOS)