UActorComponent::ClearUCSModifiedProperties

function Engine Since 4.0

#include "Components/ActorComponent.h"

Access: public Specifiers: ENGINE_API

Description

Clears the entire UCS-modified properties list for this component, resetting all property change tracking from the User Construction Script.

Caveats & Gotchas

• After calling this, all properties previously tracked as UCS-modified are considered 'clean' — subsequent archetype or instance data loads may overwrite them without the UCS-modified guard preventing it.
• This is called automatically by the engine during Blueprint compilation and component re-registration. Calling it manually can desynchronize the editor's understanding of which properties are instance-overridden.

Signature

ENGINE_API void ClearUCSModifiedProperties();

Return Type

void

Example

Reset UCS tracking before re-running construction script C++

#if WITH_EDITOR
void RerunConstructionScript(UActorComponent* Comp)
{
	Comp->ClearUCSModifiedProperties();
	// Engine will call DetermineUCSModifiedProperties after UCS re-executes
}
#endif

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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