?/TD>
Microsoft DirectX 9.0

D3DXQuaternionInverse Function


Conjugates and renormalizes a quaternion.

Syntax

D3DXQUATERNION *D3DXQuaternionInverse(      

    D3DXQUATERNION *pOut,     CONST D3DXQUATERNION *pQ );

Parameters

pOut
[in, out] Pointer to the D3DXQUATERNION structure that is the result of the operation.
pQ
[in] Pointer to the source D3DXQUATERNION structure.

Return Value

Pointer to a D3DXQUATERNION structure that is the inverse quaternion of the quaternion.



Remarks

A unit quaternion, is defined by:
Q == (cos(theta), sin(theta) * v) where |v| = 1
The natural logarithm of Q is, ln(Q) = (0, theta * v)

The return value for this function is the same value returned in the pOut parameter. In this way, the D3DXQuaternionInverse function can be used as a parameter for another function.

Function Information

Headerd3dx9math.h
Import libraryd3dx9.lib
Minimum operating systems Windows 98

See Also

D3DXQuaternionConjugate, D3DXQuaternionNormalize


© 2002 Microsoft Corporation. All rights reserved.