FVector::DotProduct

function Core Blueprint Since 1.0

#include "Math/Vector.h"

Access: public Specifiers: static

Description

Computes the dot product of two vectors: `A.X*B.X + A.Y*B.Y + A.Z*B.Z`. If both vectors are unit (normalized), the result is the cosine of the angle between them: 1.0 = same direction, 0.0 = perpendicular, -1.0 = opposite.

Signature

static double DotProduct(const FVector& A, const FVector& B)

Parameters

Name	Type	Description	Default
A	const FVector&	First vector (should be normalized for directional checks).	—
B	const FVector&	Second vector (should be normalized for directional checks).	—

Return Type

double

Caveats & Gotchas

• Inputs must be normalized for the result to equal the cosine of the angle between them.
• Can also be written as `A | B` using the operator overload.

Example

Checking if an actor is in front of another C++

FVector Forward = GetActorForwardVector(); // Already normalized
FVector ToTarget = (Target->GetActorLocation() - GetActorLocation()).GetSafeNormal();

float Dot = FVector::DotProduct(Forward, ToTarget);
// Dot > 0: target is in front
// Dot < 0: target is behind
// Dot >= 0.7f: within ~45 degrees of forward

Version History

Introduced in: 1.0

Version	Status	Notes
5.6	stable	—

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