D3DXMatrixRotationX function (D3DX10Math.h)
Builds a matrix that rotates around the x-axis.
D3DXMATRIX* D3DXMatrixRotationX( _Inout_ D3DXMATRIX *pOut, _In_ FLOAT Angle );
pOut [in, out]
Pointer to the D3DXMATRIX structure that is the result of the operation.
Angle of rotation in radians. Angles are measured clockwise when looking along the rotation axis toward the origin.
Pointer to a D3DXMATRIX structure rotated around the x-axis.
The return value for this function is the same value returned in the pOut parameter. In this way, the D3DXMatrixRotationX function can be used as a parameter for another function.