XMVector3ReciprocalLengthEst

Estimates the reciprocal of the length of a 3D vector.

Syntax

XMVECTOR XMVector3ReciprocalLengthEst(
         XMVECTOR V
)  

Parameters

V
Type: XMVECTOR 

3D vector.

Return value

Type: XMVECTOR 

Returns a vector, each of whose components are estimates of the reciprocal of the length of V.

Remarks

Est functions offer increased performance at the expense of reduced accuracy. Est functions are appropriate for non-critical calculations where accuracy can be sacrificed for speed. The exact amount of lost accuracy and speed increase are platform dependent.

Requirements

Header: Declared in directxmath.h.