gistfile1.txt

#include <sourcemod>
#include <sdktools>

public void OnMapStart ( )
{
	int ent;
	static int FogIndex = -1;
	ent = FindEntityByClassname(-1, "light_environment");
	if (ent != -1)
	{
		FogIndex = ent;
	}
	else
	{
		FogIndex = CreateEntityByName("light_environment");
		DispatchSpawn(FogIndex);
	}
	AcceptEntityInput(FogIndex, "TurnOff");
}