D3DXQuaternionInverse

Conjugates and renormalizes a quaternion.

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 Values

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

Remarks

A unit quaternion, Q == (cos(theta), sin(theta) * v)
The inverse of Q is, Inv(Q) = Conjugate(Q)/LengthSq(Q)

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.

Requirements

  Header: Declared in D3dx8math.h.
  Import Library: Use D3dx8.lib.

See Also

D3DXQuaternionConjugate, D3DXQuaternionNormalize