The AFSM format controls AI behavior; it stands for AI Finite State Machine. AI-controlled creatures have a limited number of possible states they can be in. The AFSM file defines those states, and what triggers can cause it to transition to another state.
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This file format is almost completely documented
We should have a list of possible states and triggers and a short explanation of what they generally do on this page somewhere. Also, the float settings on conditions is unknown.
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Format
The format first defines a list of states, then defines the triggers for each transition attached to each state. There are no state/trigger type IDs; rather, the name string itself is used as an identifier to fetch the corresponding AI function. It starts with a short header listing each state and then providing a trigger count. Note that the trigger count isn't actually used to parse the file; it's present merely because the game uses it to allocate space for each trigger ahead of time.
| Type
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Count
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Description
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| long
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1
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State count (SC)
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| string
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SC
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State names (each zero-terminated)
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| long
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1
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Trigger count
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State Transitions
Following that, it iterates through each state, defining the transitions associated with each one. Transitions are composed of a target state index and a number of triggers; when all the triggers associated with a transition are satisfied, it advances to the targeted state. The state transitions are structured like this:
| Type
|
Count
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Description
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| long
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1
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Transition count (TC)
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| Transition
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TC
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Transitions
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Transitions
| Type
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Count
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Description
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| long
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1
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Trigger count (TC)
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| Trigger
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TC
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Triggers
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Trigger
| Type
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Count
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Description
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| string
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1
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Trigger name (zero-terminated)
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| float
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1
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Unknown (possibly AI function parameter)
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| long
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1
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Target state index (note: this is ONLY present on the first trigger for each transition!)
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