The following example, from a fictitious 3-D model class written in C++, uses the helper functions in the D3dutil.cpp and D3dmath.cpp files (included with the DirectX SDK) to create a world matrix that includes three rotations to orient a model and a translation to relocate it relative to its position in world space.

/*
 * For the purposes of this example, the following variables
 * assumed to be valid and initialized.
 *
 * The m_vPos variable is a D3DVECTOR that contains the model's
 * location in world coordinates.
 *
 * The m_fPitch, m_fYaw, and m_fRoll variables are D3DVALUEs that 
 * contain the model's orientation in terms of pitch, yaw, and roll
 * angles (in radians).
 */
 
D3DMATRIX C3DModel::MakeWorldMatrix(void)
{
    D3DMATRIX matWorld, // World matrix being constructed.
      matTemp,  // Temp matrix for rotations.
      matRot;   // Final rotation matrix (applied to matWorld).
 
    // Using the left-to-right order of matrix concatenation,
    // apply the translation to the object's world position
    // before applying the rotations.
    D3DUtil_SetTranslateMatrix(matWorld, m_vPos);
    D3DUtil_SetIdentityMatrix(matRot);
 
    //
    // Now, apply the orientation variables into the 
    // world matrix
    //
    if(m_fPitch || m_fYaw || m_fRoll)
    {
// Produce and combine the rotation matrices.
D3DUtil_SetRotateXMatrix(matTemp, m_fPitch);    // pitch
D3DMath_MatrixMultiply(matRot,matRot,matTemp);
D3DUtil_SetRotateYMatrix(matTemp, m_fYaw);      // yaw
D3DMath_MatrixMultiply(matRot,matRot,matTemp);
D3DUtil_SetRotateZMatrix(matTemp, m_fRoll);     // roll
D3DMath_MatrixMultiply(matRot,matRot,matTemp);
 
// Apply the rotation matrices to complete the world matrix.
D3DMath_MatrixMultiply(matWorld, matRot, matWorld);
    }
    return (matWorld);
} 

After you prepare the world transformation matrix, call the IDirect3DDevice7::SetTransform method to set it, specifying the D3DTRANSFORMSTATE_WORLD flag in the first parameter. For more information, see Setting Transformations.

The following example, from a fictitious 3-D model class, uses the functions offered by the DirectX7 class to create a world matrix that includes three rotations to orient a model and a translation to relocate it relative to its position in world space.

'
' For the purposes of this example, the following variables
' assumed to be valid and initialized.
'
'   The g_dx variable contains a valid reference to a DirectX7 object.
'
'   The m_vPos variable is a D3DVECTOR that contains the model's
'   location in world coordinates.
'
'   The m_sPitch, m_sYaw, and m_sRoll variables are Singles that
'   contain the model's orientation in terms of pitch, yaw, and roll
'   angles (in radians).
'
Public Function MakeWorldMatrix() As D3DMATRIX
    Dim matWorld As D3DMATRIX   ' World matrix to be returned.
    Dim matTemp As D3DMATRIX    ' Temp matrix to hold rotations.
    Dim matRot As D3DMATRIX     ' Temp rotation matrix.
 
    ' Modify matWorld to create a translation matrix.
    Call g_dx.IdentityMatrix(matWorld)
    matWorld.rc41 = m_vPos.x
    matWorld.rc42 = m_vPos.y
    matWorld.rc43 = m_vPos.z
    
    Call g_dx.IdentityMatrix(matRot) ' Sets up the rotation matrix
    
    '
    ' Using the left-to-right order of matrix concatenation,
    ' apply the translation to the object's world position
    ' before applying the rotations.
    '
    
    ' Produce and combine the rotation matrices.
    If (m_sPitch <> 0) Or (m_sYaw <> 0) Or (m_sRoll <> 0) Then
' First, pitch.
Call g_dx.RotateXMatrix(matTemp, m_sPitch)
Call g_dx.MatrixMultiply(matRot, matRot, matTemp)

' Then, yaw.
Call g_dx.RotateYMatrix(matTemp, m_sYaw)
Call g_dx.MatrixMultiply(matRot, matRot, matTemp)

' Finally, roll.
Call g_dx.RotateZMatrix(matTemp, m_sRoll)
Call g_dx.MatrixMultiply(matRot, matRot, matTemp)
 
' Apply the rotation matrices to the translation already in
' matWorld to complete the world matrix.
Call g_dx.MatrixMultiply(matWorld, matRot, matWorld)
    End If
    
    MakeWorldMatrix = matWorld
End Function

After you prepare the world transformation matrix, call the Direct3DDevice7.SetTransform method to set it, specifying the D3DTRANSFORMSTATE_WORLD flag in the first parameter. For more information, see Setting Transformations.