FVector::IsZero

function Core Since unknown

#include "Math/Vector.h"

Access: public Specifiers: const

Description

Returns true if all three components are exactly zero. Performs no floating-point tolerance — use IsNearlyZero() for practical zero checks.

Signature

bool IsZero() const

Return Type

bool

Caveats & Gotchas

• Exact zero comparison — any floating-point arithmetic on a previously-zero vector can produce a non-zero result (e.g. 0.0f + tiny_epsilon). In practice, IsNearlyZero() is almost always more appropriate.
• FVector::ZeroVector is guaranteed to be exactly (0, 0, 0), so IsZero() is reliable for detecting default-initialised or explicitly zeroed vectors.

Example

Check for a deliberately unset vector C++

// Detect that no override direction was set (explicit zero sentinel)
if (OverrideDirection.IsZero())
{
	// Fall back to actor's forward vector
	OverrideDirection = GetActorForwardVector();
}

Version History

Introduced in: unknown

Version	Status	Notes
5.6	stable	—

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