XMQuaternionMultiply function (directxmath.h)
Computes the product of two quaternions.
Syntax
XMVECTOR XM_CALLCONV XMQuaternionMultiply(
[in] FXMVECTOR Q1,
[in] FXMVECTOR Q2
) noexcept;
Parameters
[in] Q1
First quaternion.
[in] Q2
Second quaternion.
Return value
Returns the product of two quaternions as Q2*Q1.
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 result represents the rotation Q1 followed by the rotation Q2 to be consistent with XMMatrixMulplity concatenation since this function is typically used to concatenate quaternions that represent rotations (i.e. it returns Q2*Q1).
This function computes the equivalent to the following pseudo-code:
XMVECTOR Result;
Result.x = (Q2.w * Q1.x) + (Q2.x * Q1.w) + (Q2.y * Q1.z) - (Q2.z * Q1.y);
Result.y = (Q2.w * Q1.y) - (Q2.x * Q1.z) + (Q2.y * Q1.w) + (Q2.z * Q1.x);
Result.z = (Q2.w * Q1.z) + (Q2.x * Q1.y) - (Q2.y * Q1.x) + (Q2.z * Q1.w);
Result.w = (Q2.w * Q1.w) - (Q2.x * Q1.x) - (Q2.y * Q1.y) - (Q2.z * Q1.z);
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 |