Estimates the length of a 4D vector.
XMVECTOR XM_CALLCONV XMVector4LengthEst( FXMVECTOR V );
Returns a vector, each of whose components are estimates of the length of V.
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.
|Header||directxmath.h (include DirectXMath.h)|