The modify_variable action modifies the value of one of the logic variables.

Each group comes with a set of 4 variables with IDs ranging from 0 to 3. Variables are floating point values.

Local variables are the variables of the current group, and they are expressed with a 'v' followed by the variable ID (0-3), for example: v0.

Note that foreign variables are accessible only if the group name is unique in the manager or in the world. They are expressed with the group name followed by a colon ':' and then followed by a local variable identifier (v), for example: group_1:v2.

Constant values are floating-point numerical expressions in base 10.

<local_variable | foreign_variable> < = | + | - | * | / > <local_variable | foreign_variable | constant_value>

• <local_variable | foreign_variable>: Name of the local or foreign variable to modify.
• <= | + | - | * | />: Operator to apply to the variable. The + operator acts like += in C.
• <local_variable | foreign_variable | constant_value>: Name of the local or foreign variable, or constant value to use in the operation.

This example modifies variable 3 of my_npc_group, incrementing it by 1.

my_npc_group:v3 + 1

• Condition If: A similar action that performs a conditional test on group variables and executes a sub-action if the condition is met. This action can be used in conjunction with modify_variable.
• Code: An action that executes a block of AI script code. This action can be used for more advanced variable manipulation that cannot be achieved with modify_variable.
• Random Select: An action that executes one of its child actions at random. This action can be useful in combination with modify_variable to create randomized behavior.