D3DXQuaternionToAxisAngle function (D3dx9math.h)

Note

The D3DX utility library is deprecated. We recommend that you use DirectXMath instead.

Computes a quaternion's axis and angle of rotation.

Syntax

void D3DXQuaternionToAxisAngle(
  _In_    const D3DXQUATERNION *pQ,
  _Inout_       D3DXVECTOR3    *pAxis,
  _Inout_       FLOAT          *pAngle
);

Parameters

pQ [in]

Type: const D3DXQUATERNION*

Pointer to the source D3DXQUATERNION structure.

pAxis [in, out]

Type: D3DXVECTOR3*

This function returns a pointer to a D3DXVECTOR3 structure that identifies the quaternion's axis of rotation.

pAngle [in, out]

Type: FLOAT*

This function returns a pointer to a FLOAT value that identifies the quaternion's angle of rotation in radians.

Return value

No return value.

Remarks

Use D3DXQuaternionNormalize for any quaternion input that is not already normalized.

Requirements

Requirement	Value
Header	D3dx9math.h
Library	D3dx9.lib

See also

Math Functions