| Microsoft DirectX 8.1 (Visual Basic) | 
Determines the product of two matrices.
D3DXMatrixMultiply( _ 
    MOut As D3DMATRIX, _ 
    M1 As D3DMATRIX, _ 
    M2 As D3DMATRIX)
If the function fails, an error is raised and Err.Number can be set to one of the following values.
| D3DERR_INVALIDCALL | 
| D3DERR_OUTOFVIDEOMEMORY | 
For information on trapping errors, see the Microsoft® Visual Basic® Error Handling topic.
The result represents the transformation M2 followed by the transformation M1 (Out = M1 * M2).