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Unreal Engine — Knowledge Base

type: indexupdated: 2026-07-17unreal_version: 5.8

CoversUnreal Engine 5.8 developer core: C++ programming & the reflection system, Blueprints visual scripting, the gameplay framework, actors/components, AI (behavior trees), input, physics & collision, the rendering feature set (Nanite, Lumen, Substrate, materials), meshes/modeling, cameras/UI, content import, and the editor. A gated XL (Pro) tier adds per-item reference depth. Verified against UE 5.8, 2026-07-17.

Not coveredThe full Unreal C++ API reference (per-class docs); art/animation content pipelines beyond import; Fab/marketplace assets; platform-specific packaging & console SDKs; and non-engine tools (UEFN/Fortnite, Twinmotion).

Current as of2026-07-17 (5.8)

🤖 Agent access: /wiki/unreal/llms.txt /wiki/unreal/llms-full.txt /wiki/unreal/index.json

The developer core of Unreal Engine 5.8 for engineers and agents building UE projects: programming with C++ and the reflection system, Blueprints visual scripting, the gameplay framework, AI, input and physics, the rendering feature set (Lumen, Nanite, materials, lighting), and the content/asset pipeline. Scope is the developer surface — not art tutorials, marketplace content, or the full C++/Blueprint API reference.

Master catalog — every page appears here.

Concepts

Editor & project basics

unreal editor and projects — the editor, project & directory structure, plugins
unreal terminology and conventions — core terms, units (1 uu = 1 cm), coordinate system

Programming

programming with cpp — the gameplay class hierarchy, modules, live coding
unreal reflection system — UCLASS/UPROPERTY/UFUNCTION macros & metadata specifiers
actors and components — AActor lifecycle, components, attachment, spawning
blueprints visual scripting — the Blueprint editor, graphs, variables, flow control
blueprint communication — interfaces, event dispatchers, function libraries

Gameplay

gameplay framework — GameMode/GameState, Controller, Pawn, PlayerState, GameInstance
input system — input mappings and the player controller's role
physics and collision — collision queries, traces, Chaos physics
ai behavior trees — Behavior Trees, EQS, StateTree, AI debugging
cameras and ui — cameras, view targets, UMG/HUD

Rendering

lumen global illumination — dynamic global illumination & reflections
nanite virtualized geometry — virtualized micropolygon geometry
materials and substrate — the material graph, PBR inputs, Substrate
lighting and shadows — lighting, Virtual Shadow Maps, the Path Tracer

Content

content import pipeline — Interchange, FBX/glTF/USD/Alembic/Datasmith
meshes and modeling — static & skeletal meshes, Modeling Mode, geometry scripting

Entities

unreal engine — the engine as a platform
unreal editor — the editor application

Syntheses

blueprints vs cpp — Blueprints vs C++: which to use
rendering feature map — Lumen vs Nanite vs Path Tracer vs Substrate
choosing gameplay systems — GameMode/Pawn/Controller & AI system choices

XL edition (Pro)

Deeper per-item reference is available to Pro subscribers under this wiki's XL edition (not listed above): the full UPROPERTY/UFUNCTION/UCLASS reflection specifier tables, the C++ core types (FString/FName/FText, UObject & memory), the module/build system (.Build.cs, UHT, CLI args), Enhanced Input, gameplay tags & GAS, data assets/tables/registries, asset management, and networking & replication — 17 pages. Subscribe at /pro.

Statistics

Total pages: 23
Concepts: 18
Entities: 2
Summaries: 0
Syntheses: 3