L4D2 Level Design/Boss Prohibition

There are multiple ways to prohibit or control the occurrence of boss infected in Left 4 Dead 2, which include mission.txt and vscripts.

Mission.txt

"coop_boss_spawning" and "versus_boss_spawning" was introduced in The Sacrifice update. Known variables include:

coop_boss_spawning and versus_boss_spawning

Variable	Type	Range | Notes
spawn_pos_min	float	0..1	Percentage flow cleared by survivors?
spawn_pos_max	float	0..1
tank_chance	float	0..1
witch_chance	float	0..1
witch_and_tank	int	1

Please see List of L4D2 Missions Files (using browser text search) for full examples of their use.

Vscript

Vscripts appear to be more flexible. This is now done with a script file that you should place in your left4dead2/scripts/vscripts folder (you may need to add the vscripts subfolder yourself). Add the following to a text file:

DirectorOptions <-
{
   ProhibitBosses = true
}

Save the textfile with the extention .nut in the vscripts folder. In your map, place a logic_auto entity and add an output. The output should target the AI Director entity and make it fire the script by using the BeginScript action. In the parameter field, you set the name of your script (without the .nut extention)

See also

• L4D2 Vscripts
• Left 4 Dead 2 Level Creation

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