Movement Systems¶

This controls how zombies move around on the virtual map. You can make different groups of zombies behave in different ways.

How Groups Work¶

The mod automatically creates groups of zombies based on your settings:

Number of groups = (Total zombies) ÷ (GroupSize)

For example:

If you have 100 zombies total
And GroupSize is 20
You get 5 groups (numbered 0, 1, 2, 3, 4)

How Systems Get Assigned to Groups¶

Each movement system has a Weight value that determines how many groups it controls. Groups are distributed proportionally based on weight.

For example, with 5 groups and two systems:

System A with Weight="2" gets ~67% of groups → groups 0, 1, 2
System B with Weight="1" gets ~33% of groups → groups 3, 4

If you only have one system, it controls all groups regardless of its weight value.

Every system is guaranteed at least one group.

System Settings¶

Each system can have these settings:

Weight¶

How many groups this system controls, relative to other systems.

Weight="1" is the default
Higher values mean more groups are assigned to this system
The actual number of groups depends on the total group count and other systems' weights

SpeedScale¶

How fast zombies move on the virtual map (not in the game).

1.0 = normal speed
2.0 = twice as fast
0.5 = half speed

This only affects the simulation, not how fast zombies move when they spawn in your game.

PostSpawnBehavior¶

What zombies do after they appear in your game:

Wander: Zombies just walk around randomly
ChaseActivator: Zombies chase whatever made them spawn (usually you)

PostSpawnWanderSpeed¶

How fast zombies walk when they're just wandering (not chasing you):

NoOverride: Use the game's normal setting
Walk: Slow walking
Jog: Faster walking
Run: Running
Sprint: Fast running
Nightmare: Very fast

This only matters when zombies are wandering. When they see you or attack, they use the game's normal speed.

Color¶

What color to show this group in the Editor tool. This is just for viewing and doesn't affect the game.

Use colors like: #FF0000 (red), #00FF00 (green), #0000FF (blue)

Processors¶

You can add different processors to each system. Each processor has two settings:

Power: How strong the behavior is (higher = stronger)
Distance: How far away the behavior works (only some behaviors use this)

See the Processors page for all the different types you can use.

Simple Example¶

Here's a basic setup with one system that controls all groups:

<Systems>
  <System Weight="1" SpeedScale="1.0" PostSpawnBehavior="Wander" Color="#FF0000">
    <Processor Type="FlockSameGroup" Distance="15.0" Power="0.6" />
    <Processor Type="WorldEvents" Power="0.8" />
  </System>
</Systems>

This makes all zombie groups stick together and react to loud noises.

Multiple Systems with Weights¶

You can define multiple systems with different weights to create diverse behavior:

<Systems>
  <System Weight="2" SpeedScale="1.0" PostSpawnBehavior="Wander" Color="#FF0000">
    <Processor Type="FlockSameGroup" Distance="15.0" Power="0.6" />
  </System>
  <System Weight="1" SpeedScale="1.5" PostSpawnBehavior="ChaseActivator" Color="#00FF00">
    <Processor Type="WorldEvents" Power="0.8" />
  </System>
</Systems>

With 6 groups total:

Groups 0–3: Use the first system (weight 2 → gets twice as many groups). Zombies stick together and wander randomly (red in Editor).
Groups 4–5: Use the second system (weight 1). Zombies move faster, chase loud noises, and chase you when they spawn (green in Editor).

Equal Weights¶

If all systems have the same weight, groups are split evenly:

<Systems>
  <System Weight="1" SpeedScale="0.8" PostSpawnBehavior="Wander" Color="#44AA44">
    <Processor Type="Wind" Power="0.7" />
  </System>
  <System Weight="1" SpeedScale="0.8" PostSpawnBehavior="Wander" Color="#9E4244">
    <Processor Type="WindInverted" Power="0.7" />
  </System>
  <System Weight="1" SpeedScale="0.8" PostSpawnBehavior="Wander" Color="#57A8BF">
    <Processor Type="StickToRoads" Power="1.0" />
  </System>
</Systems>

With 9 groups, each system gets 3 groups.