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XMQuaternionInverse function (directxmath.h)

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Computes the inverse of a quaternion.

Syntax

XMVECTOR XM_CALLCONV XMQuaternionInverse(
  [in] FXMVECTOR Q
) noexcept;

Parameters

[in] Q

Quaternion to invert.

Return value

Returns the inverse of Q.

Remarks

The DirectXMath quaternion functions use an XMVECTOR 4-vector to represent quaternions, where the X, Y, and Z components are the vector part and the W component is the scalar part.

The following pseudocode demonstrates the operation of the function:

XMVECTOR Result;

float LengthSq = Q.x * Q.x + Q.y * Q.y + Q.z * Q.z + Q.w * Q.w;

Result.x = -Q.x / LengthSq;
Result.y = -Q.y / LengthSq;
Result.z = -Q.z / LengthSq;
Result.w = Q.w / LengthSq;

return Result;

Platform Requirements

Microsoft Visual Studio 2010 or Microsoft Visual Studio 2012 with the Windows SDK for Windows 8. Supported for Win32 desktop apps, Windows Store apps, and Windows Phone 8 apps.

Requirements

Requirement Value
Target Platform Windows
Header directxmath.h

See also

DirectXMath Library Quaternion Functions