D3DXMatrixIdentity

The D3DXMatrixIdentity function creates an identity matrix.

D3DXMATRIX* D3DXMatrixIdentity(
  D3DXMATRIX* pOut
); 

Parameters

pOut

A pointer to the D3DXMATRIX structure that is the result of the operation.

Return Values

A pointer to a D3DXMATRIX structure that is the identity matrix.

Remarks

The identity matrix is a matrix in which all coefficients are 0 except the [1,1][2,2][3,3][4,4] coefficients, which are set to 1. The identity matrix is special in that when it is applied to vertices, they are unchanged. The identity matrix is used as the starting point for matrices that will modify vertex values to create rotations, translations, and any other transformations that can be represented by a 4×4 matrix.

The return value for this function is the same value returned in the pOut parameter. In this way, the D3DXMatrixIdentity function can be used as a parameter for another function.

Requirements

  Windows NT/2000: Requires Windows 2000.
  Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Version: Requires DirectX 7.0.
  Header: Declared in d3dxmath.h.
  Library: Use d3dx.lib.

See Also

D3DXMatrixIsIdentity