Unreal Engine API reference
that actually makes sense.

Community-maintained documentation for UE 5.6 C++ and Blueprint APIs. Real signatures, real caveats, real examples.

Browse by Category

Base object model, reflection system, garbage collection.

Actors, components, world management, gameplay framework.

FVector, FRotator, FTransform, TArray, TMap, TSet.

Behavior Trees, AI Controllers, Perception system.

Replication, RPCs, Online Subsystem.

Materials, render targets, post-processing, shaders.

Actor lifecycle, tick groups, BeginPlay ordering, replication timing, and common gotchas.

Local, Absolute/Window, Viewport (pixel vs scaled), Screen/Desktop, and Paint/Render spaces — with every conversion function.