Atlas — a fictional example

Engine/Source/Runtime/Engine/Private/Components/CharacterMovementComponent.cpp
21void UCharacterMovementComponent::PhysWalking(float deltaTime, int32 Iterations)
25    while ((deltaTime >= MIN_TICK_TIME) && (Iterations < MaxSimulationIterations))

void UCharacterMovementComponent::PerformMovement(float DeltaSeconds)
{
    SCOPE_CYCLE_COUNTER(STAT_CharacterMovementPerformMovement);

    if (!HasValidData() || UpdatedComponent->IsSimulatingPhysics())
    {
        return;
    }

    // Integrate pending root motion and velocity for the active movement mode.
    StartNewPhysics(DeltaSeconds, 0);
    UpdateComponentVelocity();
}

void UCharacterMovementComponent::PhysWalking(float deltaTime, int32 Iterations)
{
    SCOPE_CYCLE_COUNTER(STAT_CharPhysWalking);

    while ((deltaTime >= MIN_TICK_TIME) && (Iterations < MaxSimulationIterations))
    {
        Iterations++;
        const float timeTick = GetSimulationTimeStep(deltaTime, Iterations);
        deltaTime -= timeTick;

        const FVector OldLocation = UpdatedComponent->GetComponentLocation();
        FStepDownResult StepDownResult;

        // Project horizontal velocity onto the current floor plane and sweep.
        MoveAlongFloor(Velocity, timeTick, &StepDownResult);

        // Reuse the step-down floor hit when available to avoid a redundant sweep.
        if (StepDownResult.bComputedFloor)
        {
            CurrentFloor = StepDownResult.FloorResult;
        }
        else
        {
            FindFloor(UpdatedComponent->GetComponentLocation(), CurrentFloor, false);
        }

        if (!CurrentFloor.IsWalkableFloor())
        {
            SetMovementMode(MOVE_Falling);
            StartNewPhysics(deltaTime, Iterations);
            return;
        }
    }
}

void UCharacterMovementComponent::MoveAlongFloor(
    const FVector& InVelocity,
    float DeltaSeconds,
    FStepDownResult* OutStepDownResult)
{
    if (!CurrentFloor.IsWalkableFloor())
    {
        return;
    }
Paused: source breakpoint
Frames
UCharacterMovementComponent::PhysWalkingCharacterMovementComponent.cpp:35
UCharacterMovementComponent::PerformMovementCharacterMovementComponent.cpp:16
ACharacter::TickActorCharacter.cpp:12
FEngineLoop::TickLaunchEngineLoop.cpp:5000
PhysWalking
NameValueType
Locals
this0x000001f4a8c12000UCharacterMovementComponent *4
deltaTime0.0083333float
Iterations1int32
StepDownResult{bComputedFloor=true, FloorResult={...}}FStepDownResult
Registersread on request