UE5 Blueprint Best Practices

UE5 Blueprint Best Practices

Guidelines for clean, maintainable Blueprint code.

Zero Tolerance Policy

Zero warnings, zero errors - Fix all Blueprint compilation issues before committing.

Naming Conventions

Variables

Rule	Example
PascalCase	PlayerHealth, MaxAmmo
Boolean prefix b	bIsAlive, bCanJump, bHasWeapon
No abbreviations	CurrentHealthPoints not CurHP

Functions

Type	Naming	Example
Actions	Verb	FireWeapon, TakeDamage
Events	On prefix	OnDeath, OnItemPickup
Queries	Is/Has/Can	IsAlive, HasAmmo, CanFire

RPC Functions

Prefix	Direction
Server_	Client → Server
Client_	Server → Client
Multicast_	Server → All Clients

Function Guidelines

• 50-node maximum per function
• All functions must have return nodes
• Group related nodes with comment blocks
• Align wires, not nodes for readability

Graph Organization

[Comment: Input Handling]
┌─────────────────────────┐
│  Input → Validate →     │
│  Process → Output       │
└─────────────────────────┘

[Comment: Combat Logic]
┌─────────────────────────┐
│  Damage Calculation     │
│  → Apply → Notify       │
└─────────────────────────┘

Performance

Avoid	Use Instead
Complex Tick logic	Timers or events
Many Cast nodes	Interfaces or cached refs
String operations in Tick	Pre-computed values
Deep nesting (>3 levels)	Extracted functions

When to Use C++

Move to C++ when:

• Heavy per-frame calculations
• Complex math operations
• Large data structure manipulation
• Performance-critical systems
• Deep inheritance hierarchies

Best Practices Checklist

• All variables have categories assigned
• All functions have descriptions/tooltips
• Event Graph is organized with comments
• No unconnected nodes (reroute or delete)
• Consistent execution flow (left to right)
• Local variables used appropriately
• No duplicate code (use functions/macros)

Variable Categories

Organize with numbered prefixes for consistent ordering:

00|Core
01|Combat
02|Movement
03|UI
04|Audio
05|Debug

Documentation: https://dev.epicgames.com/documentation/en-us/unreal-engine/blueprint-best-practices-in-unreal-engine