State Machine

A graph of animation states connected by transitions. Each state plays a sequence/blend; transitions fire on rule conditions.

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Create a Blueprint for a car turntable that auto-rotates and allows mouse drag to manually rotate the car

MakeRotator — construct FRotator from Roll Pitch Yaw

UKismetMathLibrary::MakeRotator. NOT MakeRot.

CreateDynamicMaterialInstance — create a runtime-editable material copy

Must call this before SetScalarParameterValue/SetVectorParameterValue. Store the result in a variable for reuse.

CreateDynamicMaterialInstance — create runtime modifiable material

UPrimitiveComponent method. Store result in variable and reuse. Create once in BeginPlay.

Pickup and collectible system with overlap trigger

Pattern: Pickup actor with SphereCollision(overlap), StaticMesh visual. OnComponentBeginOverlap → CastTo PlayerCharacter → Success: call AddScore/AddItem interface on player → PlaySoundAtLocation → SpawnEmitterAtLocation → DestroyActor(self). Set collision to OverlapOnlyPawn for performance.

Create a Blueprint for a simple elevator that moves between two floors when a button is pressed

Possess — make a Controller possess a Pawn

EnhancedInputAction — Enhanced Input system action event

K2Node_EnhancedInputAction. ActionValue type depends on InputAction (Bool, Float, Axis2D, Axis3D). Triggers: Started, Ongoing, Triggered, Completed, Canceled.