Gameplay Effect

Duration

Duration stuff is mostly done in FActiveGameplayEffectsContainer::ApplyGameplayEffectSpec. The container will register a delegate to UAbilitySystemComponent::CheckDurationExpired for the calculated duration (this only calls FActiveGameplayEffectsContainer::CheckDuration in 5.6).

Execution

See FActiveGameplayEffectsContainer::ExecuteActiveEffectsFrom.

Periodic execution

See UAbilitySystemComponent::ExecutePeriodicEffect and FActiveGameplayEffectsContainer::ExecutePeriodicGameplayEffect.

Stacking

When calling UAbilitySystemComponent::ApplyGameplayEffectSpecToTarget or UAbilitySystemComponent::ApplyGameplayEffectSpecToSelf it will eventually call FActiveGameplayEffectsContainer::ApplyGameplayEffectSpec which will try to find a stackable effect with FActiveGameplayEffectsContainer::FindStackableActiveGameplayEffect.

This means that the returned FActiveGameplayEffectHandle will be pointing to the already applied GE if it was stacked, otherwise its a “new” handle pointing to a “new” active GE.

Warning

The new GE Spec you passed to ApplyGameplayEffectSpecToSelf will override the previous GE spec of the already active GE.

Miscs

See UGameplayEffectCreationMenu to add custom menu entries in the Content Browser for your gameplay effects.