Response System

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Introduction

Response System controls what a NPC talks on a certain situation. e.g. It makes Alyx say "Excuse me" when the player pushes her, Citizens greet when they see the player, Vortigaunts tell stories on USE button, etc.

/scripts/talker/response_rules.txt is the base script file for the global Response System that controls Expressive NPCs.

Also an env_speaker entity can specify its own Context rule script. See scripts/talker/terminal_pa.txt for terminal announcement example.

These scripts contain criterion/rule/response definitions. The Response system checks each rule against the set, give it a numeric score based on the rule's set of criteria. Then the system picks one rule with the highest score, dispatch a response that the rule points.

• Concepts
• Criteria
• Enumeration
• Contexts
• Rules
• Reponses

Add your new custom NPC to the Response System

• Make your NPC derived from NPC_talker
• Write a new rule script for your NPC
  • See npc_xxx.txt for examples
• Include the new script in /scripts/talker/response_rules.txt