How to replicate the Photopia talking system

I know this is an Inform 7 area but TADS 3 with Adv3Lite provides numerous options for interaction between the PC and the NPC.

Here is a listing from the index of Eric Eve’s Adv3Lite Manual:

Actor States
AgendaItems
Basic Ask/Tell
ActorTopicEntry
Suggesting Conversational Topics
Special Topics
Topic Groups
Conversation Nodes
Hello and Goodbye
Player Character and NPC Knowledge
Giving Orders to NPCs
String Tags and Object Tags
NPC-Initiated Conversation

TADS 3 with Adv3Lite is well worth consideration.

PS. Even if you don’t use TADS, the techniques may be transferable to other development systems.

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