I tried building AI directly inside the Character Blueprint. It worked for simple tests. But once behavior became complex, everything got messy.
This post is part of my daily learning journey in game development.
I’m sharing what I learn each day — the basics, the confusion, and the real progress — from the perspective of a beginner.
On Day 79 of my game development journey, I explored how AI systems are structured in Unreal Engine.
What I Used to Think
At first, I thought everything should live inside the Character Blueprint.
Movement, detection, and attack logic — all in one place.
But as soon as I added more behaviors, the Blueprint became difficult to manage. That’s when I started using Unreal’s built-in AI framework.
What I Realized
Unreal separates AI into multiple systems, each with a clear role.
- Character Blueprint → the physical body in the world
- AI Controller → the brain that controls the character
- Behavior Tree → the decision-making system
- Blackboard → memory storage for important data
- AI Perception → senses that detect the environment
Each system handles a different responsibility.
Why This Matters
When the AI sees or hears something, AI Perception detects it. The AI Controller receives that information.
Important values like the detected player or location are stored in the Blackboard. The Behavior Tree reads those values and decides what action to perform.
Example flow:
AI Perception → AI Controller → Blackboard → Behavior Tree
This structure keeps the system organized and scalable.
Practical Fix
- Create an AI Character Blueprint
- Create a separate AI Controller
- Assign the controller to the character
- Create a Behavior Tree and Blackboard
- Add keys like Target Actor or Target Location
- Add AI Perception with senses like Sight and Hearing
One Lesson for Beginners
- Character Blueprint represents the body
- AI Controller handles commands and control logic
- Behavior Tree organizes decision making
- Blackboard stores important AI data
- AI Perception gathers information from the world
Separating these responsibilities makes AI systems easier to expand as the game grows.
Slow progress — but I’m building a strong foundation.
If you’re also learning game development, what was the first thing that confused you when you started?
See you in the next post 🎮🚀
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