Interfaces

Interface System for Interactions

• Interfaces allow common functions across unrelated objects

• Example: E key pressing

  • Apple: pick up and eat
  • Door: open
  • “Same interaction (E key), different outcomes”

• Creating Interface Blueprint

• Content drawer > Blueprint > Blueprint Interface

  • Denoted as “BPI”
  • Interface is collection of defined functions

• Two main functions needed

  • LookAt function

    Outputs: verb (text), noun (text) “Verb + noun = instructions” (eat apple, open door)

  • InteractWith function

    Input: PlayerCharacter (Object Reference)

• Implementing Interfaces

• Add to objects via Class Settings

  • Interfaces section > Add BPI_Interact
  • Creates new interface section under functions

• Function types

  • Events: Cannot return information
  • Functions: Can return info (like LookAt)

• Implementation Details

• Interface symbol on nodes

  • Indicates “safe” interface call
  • No errors if interface missing

• LookAt usage

  • Returns verb/noun combo
  • Can include logic (e.g. open/close door)

• Format text setup

  • Uses curly brackets {0} {1}
  • Inserts verb and noun values

Interfaces provide a flexible way to handle different object interactions with the same input. They enable consistent player interaction while allowing unique object behaviors through a structured blueprint system.