Timer with Set Timer by Function Name for repeating actions

Pattern: BeginPlay → K2_SetTimer(Self, 'MyFunction', 2.0, true) → store TimerHandle. Stop: ClearAndInvalidateTimerByHandle(TimerHandle). Prefer SetTimerByEvent over FunctionName for type safety. Delay node is simpler for one-shot but only works in Event Graph.

Timer

Schedules a function to run after a delay or on a repeating interval. Cleaner than Delay for repeating work.

SetActorTickInterval — change how often Tick fires

TickInterval=0.0 means every frame. TickInterval=0.1 means 10 times per second. Great for AI or non-critical logic that doesn't need per-frame updates.

string

string

CreateDynamicMaterialInstance — create runtime modifiable material

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

Day night cycle with directional light rotation over time

Pattern: Variables TimeOfDay(float)=12.0, DayLengthMinutes(float)=10. Tick: TimeOfDay += (DeltaSeconds/DayLengthMinutes/60)*24 → FMod(TimeOfDay, 24) → MapRangeClamped(TimeOfDay, 0, 24, 0, 360) → MakeRotator(SunPitch, 0, 0) → SetActorRotation(SunLight). Update sky SunDirection and light color/intensity based on time.

CreateDynamicMaterialInstance — create a runtime-editable material copy

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

BooleanAND — logical AND

OR=BooleanOR, NOT=Not_PreBool, XOR=BooleanXOR

Health regeneration over time with timer

Pattern: Variables RegenRate(float)=5.0, RegenDelay(float)=3.0, RegenTimerHandle. On damage received: ClearTimer(RegenTimerHandle) → SET timer(RegenDelay, RegenTick, looping=true). RegenTick function: Branch(Health < MaxHealth) → True: SET Health = FClamp(Health + RegenRate*DeltaSeconds, 0, MaxHealth). False: ClearTimer.

FMod — floating-point modulo (remainder)