UKismetMathLibrary::Quat_IsFinite

function Engine Blueprint Since 4.0

#include "Kismet/KismetMathLibrary.h"

Access: public Specifiers: staticBlueprintPure

Description

Returns true if all four components (X, Y, Z, W) are finite — neither NaN nor Infinity.

Caveats & Gotchas

• A finite quaternion is not necessarily normalized; use Quat_IsNormalized separately if you also need to verify unit length.
• NaN/Inf in quaternions most often originates from dividing by a near-zero vector length (e.g. normalizing a zero vector); check the source operation rather than just filtering outputs.

Signature

static UE_INL_API bool Quat_IsFinite(const FQuat& Q)

Parameters

Name	Type	Description	Default
Q	const FQuat&	The quaternion to test.	—

Return Type

bool

Example

Guard against NaN before applying a quaternion C++

FQuat Rot = ComputeRotation();
if (UKismetMathLibrary::Quat_IsFinite(Rot))
{
    MyComponent->SetWorldRotation(Rot);
}
else
{
    UE_LOG(LogTemp, Warning, TEXT("Invalid quaternion from ComputeRotation"));
}

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

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