UKismetMathLibrary::Vector4_CrossProduct3

function Engine Blueprint Since 4.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticUFUNCTIONBlueprintPure

Description

Computes the 3D cross product of the XYZ components of two Vector4 values. The resulting W component is 0.

Caveats & Gotchas

• The W component of both input vectors is ignored. The result always has W=0, making it suitable as a direction vector but not a homogeneous point.
• Cross product is anti-commutative: CrossProduct3(A, B) == -CrossProduct3(B, A). The order of operands determines the handedness of the resulting normal, which affects face culling if the result is used as a surface normal.

Signature

static UE_INL_API FVector4 Vector4_CrossProduct3(const FVector4& A, const FVector4& B)

Parameters

Name	Type	Description	Default
A	const FVector4&	First vector. Only the XYZ components are used.	—
B	const FVector4&	Second vector. Only the XYZ components are used.	—

Return Type

FVector4

Example

Compute a surface normal from two edge vectors C++

FVector4 Edge1(1.0, 0.0, 0.0, 0.0);
FVector4 Edge2(0.0, 1.0, 0.0, 0.0);
FVector4 Normal = UKismetMathLibrary::Vector4_CrossProduct3(Edge1, Edge2);
// Normal == (0, 0, 1, 0) — pointing up

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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