Why: the goal or problem

Imagine a village game where players collect coins. Each coin scores once, then disappears; the team wants one visual behavior graph reused across coin actors.

How: work toward a solution

The schematic contains a player, floor, camera, and one coin Actor. Move to item triggers an authored overlap guard: score changes from zero to one and the Actor disappears. Repeat contact cannot score again. Disable contact before moving to demonstrate a missed collection: score stays zero. Reset or reload restores everything. This is a concept simulation.

Explore a village game scene

Concept simulation

Unreal Engine

In a village game, move the player into the coin. Authored contact logic awards one point and removes it.

PIC
P: Player · I: Coin · C: Camera · ─: Floor

Score: 0 · Coin: Present

Initial level: player, floor, camera, collectible Actors

Collectible Blueprint class: mesh + collision components

  1. Overlap event
  2. Guard: item present?
  3. Score +1 → remove Actor
Execution boundary
Model: coin Actor → overlap event → consumed guard → score update.
State and responsibility
Page memory holds the modeled score. No Unreal runtime, network replication or durable game save is running.

A fictional demo within this article. Reset or reload restores its initial state.

What: the concept

Unreal Engine places Actors in levels. Components supply capabilities, while Blueprint graphs can define gameplay events and actions in reusable classes.

Keep graph responsibilities and score ownership explicit.

Source · Source 2