UKismetMathLibrary::Vector4_Assign

function Engine Blueprint Since 4.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticUFUNCTIONBlueprintCallable

Description

Copies all four components of InVector into A in-place. Primarily useful in Blueprint where direct assignment of struct variables requires a 'Set' node.

Caveats & Gotchas

• In C++ this is equivalent to the assignment operator (A = InVector) and offers no benefit over it. This function exists mainly to expose a mutable ref assignment to Blueprint scripting.
• Because A is passed as UPARAM(ref), Blueprint treats it as an in-out pin. The original variable at the call site is mutated; no new vector is returned.

Signature

static UE_INL_API void Vector4_Assign(UPARAM(ref) FVector4& A, const FVector4& InVector)

Parameters

Name	Type	Description	Default
A	UPARAM(ref) FVector4&	The vector variable to assign to. Passed by reference and modified in place.	—
InVector	const FVector4&	The source vector whose values are copied into A.	—

Return Type

void

Example

Reassign an existing Vector4 variable in Blueprint (C++ equivalent) C++

FVector4 MyVec(0.0, 0.0, 0.0, 0.0);
FVector4 NewValue(1.0, 2.0, 3.0, 4.0);
UKismetMathLibrary::Vector4_Assign(MyVec, NewValue);
// MyVec is now (1, 2, 3, 4)

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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