Raid/zh-hans

Raid（突袭） 是 军团要塞 2 中的一种实验性模式。该模式中，玩家们将作为5名蓝队的人类角色，于可能从四面八方出现的红队机器人大军中杀出重围，类似于求生之路系列的玩法。该模式的开发从2009年11月，也正是 求生之路2 发布的日子便早已开始，于2009年11月17日完成。开发正是由求生之路系列、TFBots 和 MvM模式背后的开发者 - Mike Booth 完成的。

该模式目前已知的主要目标并不清晰，但由游戏中可找到的一些代码可知，游戏将会检查未被占领的控制点，并使机器人对该区域的大门是否被封锁产生反应（大概是AI路径）。

敌人种类

玩家在该模式中遇到的敌人种类并不是太多，某些与求生之路中的敌人相似，大概有：

• Wanderers
• Mobs (or Hordes)
• Squads
• Specials
• Sentry Guns
• Defenders

值得一提的是，九种职业在该模式中的处理方式并不相同，大部分兵种的出现会被限制在特殊事件的触发中。

Wanderers（游荡者）

游荡者，与求生之路中的敌人类型相似，通常会重生在玩家前方将要探索的视野外区域。在突袭模式中，机器侦察兵将作为游荡者的唯一职业。游荡者只能使用近战武器，随机使用语音回应，部分会出现与其他游荡者个体进行打斗的行为。只有当玩家过于靠近或杀死附近的游荡者时才会被惊扰，在后一种情况中，玩家离杀死的敌人越近，游荡者的反应速度也会随之越快。

当游荡者在带有AGGRESSIVE效果状态下重生时，他们将会取消挂机行为并直接冲向玩家位置进行攻击。在求生之路中通常只会在尸潮倒计时到点或触发特殊事件时发生。

Mobs

Mobs, one of the prominent enemy types in Left 4 Dead, consists of a group of enemies that rush down to wherever players are and attack them, instead of the usual Wanderer's passive-aggressive behavior. By default, Mobs have a spawn time of 60 - 90 seconds, and have a total count of 15. The interval for Mobs to respawn becomes lower and players progress through the campaign. Mobs also respawn faster when players are capturing a point, having only a 20 second respawn time. The same is also done for the Left 4 Dead series's finales, where survivors have to fend themselves to wait for rescue, or to collect gas cans and fill up their objective to escape.

Classes that robots in Mobs spawn as is pre-defined. Only 4 classes are possible for Mobs to spawn as: Scouts, Pyros, Heavies and Spies. However, Squads will join in Mob fights, which consist of different classes to deal with. Squads's spawning are based on several commands, and they seem to imply a random chance of Mob spawning, but all of them are set to 100 which may be for debugging reasons. More about Squads later.

One thing is absent from Left 4 Dead though, which is "Mega Mobs", these are periods where a horde of Infecteds have a much higher spawn count than Mobs, always leading to them lasting for a while and forcing survivors to find a good defendable spot, but can allow for the game session to have intensity peaks. Presumably this wasn't kept because unlike the Infected, robots have ranged weaponry to fight back the players.

Boss Battle Submode

The gamemode would've also had boss battles.

Leftover Content

Content Creation Related

Hammer Editor

In the default entity list for the Source Engine Mapping software, Hammer, three entities can be seen that point to this gamemode: base_boss, tf_logic_raid and tf_logic_boss_battle. With the latter two not working, as their code is not loaded.

Navigation Meshes

For Navigation Meshes, or nav, which are used by bots to determine where they can go, where players can walk on and whatnot. The command tf_mark has two leftover flags which are meant for Raid mode. Which are RESCUE_CLOSET and NO_SPAWNING.

The first flag is clearly referring to these Rescue Closets in Left 4 Dead, which are areas where a previously dead survivor may spawn in, then shout for someone to get them out of the closet (which revives them). In Raid mode, the game uses this to exclude players from being counted as "alive", or use this to make the Director start certain voicelines.

The second flag is used to manually set what areas should the Director not spawn any robots. In L4D, Flags with a similar function are the flags NO_MOBS, EMPTY (No Wanderers) and NOTHREAT (which the function it does is unclear, but only speculation is to disallow special spawning.)

Population Files

Population files, or pop files, are what MvM reads to create a playable MvM mission. These files have several Raid mode leftovers, two Populators and two Spawners. They can still be used to spawn bots, but are really dated and janky. They do however, point to a time when Population files may have filled a much different role, where they could been instead to exist for an option to modify the director options for a campaign, much like Vscripts.

In Population files, there are two types of keys for managing bot spawning, Spawners and Populators. Spawners are responsible for applying anything on the bot itself like giving them crits or hats, while Populators are to setup the bot before it spawns with things like where to spawn or the total amount of them. The keys in question are: PeriodicSpawn, RandomPlacement, Mob and SentryGun, the latter two being Spawners while the others are Populators.

PeriodicSpawn only has three keys:

• When
• MinInterval
• MaxInterval

When is used to determine the respawn times, but both MinInterval and MaxInterval are used to specify random respawn times. The last two keys are only used if When is not specified. For unknown reasons, bots that are spawned using this always drops cash and mess up the game's logic regarding cash. This could however been the Bounty mode having code that may have conflicted it unintentionally.

RandomPlacement appears to be lacking with what it wanted to accomplish. It has the keys:

• Count
• MinimumSeparation
• NavAreaFilter
  • Accepts the following:
  • SENTRY_SPOT
  • SNIPER_SPOT

Based on others's experiences with this Populator, it appears that it only works with the SentryGun spawner, unusually. Another thing to note is that SENTRY_SPOT or SNIPER_SPOT isn't actually used by TFBots at all! And only SNIPER_SPOT is actually automatically added to navigation meshes when a Mapper puts a Sniper hint over a navigation mesh, which tells Snipers that its a spot they should consider sniping at.