Export (0) Print
Expand All
Expand Minimize

D3DXMatrixAffineTransformation function

Builds a 3D affine transformation matrix. NULL arguments are treated as identity transformations.

Syntax


D3DXMATRIX* D3DXMatrixAffineTransformation(
  _Inout_  D3DXMATRIX *pOut,
  _In_     FLOAT Scaling,
  _In_     const D3DXVECTOR3 *pRotationCenter,
  _In_     const D3DXQUATERNION *pRotation,
  _In_     const D3DXVECTOR3 *pTranslation
);

Parameters

pOut [in, out]

Type: D3DXMATRIX*

Pointer to the D3DXMATRIX structure that is the result of the operation.

Scaling [in]

Type: FLOAT

Scaling factor.

pRotationCenter [in]

Type: const D3DXVECTOR3*

Pointer to a D3DXVECTOR3 structure, a point identifying the center of rotation. If this argument is NULL, an identity Mrc matrix is applied to the formula in Remarks.

pRotation [in]

Type: const D3DXQUATERNION*

Pointer to a D3DXQUATERNION structure that specifies the rotation. If this argument is NULL, an identity Mr matrix is applied to the formula in Remarks.

pTranslation [in]

Type: const D3DXVECTOR3*

Pointer to a D3DXVECTOR3 structure representing the translation. If this argument is NULL, an identity Mt matrix is applied to the formula in Remarks.

Return value

Type: D3DXMATRIX*

Pointer to a D3DXMATRIX structure that is an affine transformation matrix.

Remarks

This function calculates the affine transformation matrix with the following formula, with matrix concatenation evaluated in left-to-right order:

Mout = Ms * (Mrc)-1 * Mr * Mrc * Mt

where:

Mout = output matrix (pOut)

Ms = scaling matrix (Scaling)

Mrc = center of rotation matrix (pRotationCenter)

Mr = rotation matrix (pRotation)

Mt = translation matrix (pTranslation)

The return value for this function is the same value returned in the pOut parameter. In this way, the D3DXMatrixAffineTransformation function can be used as a parameter for another function.

For 2D affine transformations, use D3DXMatrixAffineTransformation2D.

Requirements

Header

D3dx9math.h

Library

D3dx9.lib

See also

D3DXMatrixTransformation
Transforms (Direct3D 9)

 

 

Community Additions

ADD
Show:
© 2014 Microsoft