Place a dynamic light somewhere in the level and assign this script to it's AI Main.
;AI script
;Header
desc = maintain ambience
;Triggers
::ambiencered=20,ambiencegreen=20,ambienceblue=20,ambience=20
;end of script
Adjust the ambience values to suite. I think you can also add theses values to the setup.ini file.
Another way to
limit the amount of change the player can make, is to set the ambience settings as follows:
In File - Build Game - Level Settings - Global Script, set the ambience level to 20 and the Red, Green and Blue values to 20. Now the player can adjust the ambience between 0 and 20 only.
Brian.