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DarkLordax, the entire script consists of one function, and it seems to be written correctly. Is the 'TombYard' lighting definitely added to Map Properties Tree -> GroundAmbientLight?
I did it as shown in the screenshots, and after that, the function works normally:
SetAmbientLight(GROUND, ‘my_ambient’);
I did it as shown in the screenshots, and after that, the function works normally:
SetAmbientLight(GROUND, ‘my_ambient’);