VOID CMyD3DApplication::UpdateCamera()
{
	FLOAT fElapsedTime;

    if( m_fElapsedTime > 0.0f )
        fElapsedTime = m_fElapsedTime;
    else
        fElapsedTime = 0.05f;

    FLOAT fSpeed        = .9f*fElapsedTime;
    FLOAT fAngularSpeed = .5f*fElapsedTime;

    // De-accelerate the camera movement (for smooth motion)
    m_vVelocity      *= 0.9f;
	 
    // Process keyboard input
    if( m_bKey[VK_RIGHT] )   m_vVelocity.x   -= fSpeed; // Slide Right
    if( m_bKey[VK_LEFT] )    m_vVelocity.x   += fSpeed; // Slide Left
    if( m_bKey[VK_UP] )      m_vVelocity.z   -= fSpeed; // Move Forward 
    if( m_bKey[VK_DOWN] )    m_vVelocity.z   += fSpeed; // Move Backward 
	

    // Update the position vector
    D3DXVECTOR3 vT = m_vVelocity * fSpeed;
   D3DXVec3TransformNormal( &vT, &vT, &m_matView );
    m_vPosition += vT;
    if( m_vPosition.y < 1.0f )
        m_vPosition.y = 1.0f;

	    
    // Set the view matrix
      D3DXMatrixAffineTransformation( &m_matView, 1.25f, NULL, NULL, &m_vPosition );

	// When the window has focus, let the mouse adjust the camera view
    if( m_bCapture )
    {
        D3DXMATRIXA16 matCursor;
        D3DXQUATERNION qCursor = D3DUtil_GetRotationFromCursor( m_hWnd );
        D3DXMatrixRotationQuaternion( &matCursor, &qCursor );
        D3DXMatrixMultiply( &m_matView, &m_matTrackBall, &matCursor );

	
        D3DXMATRIXA16 matTrans;
        D3DXMatrixTranslation( &matTrans, 0.0f, 0.0f, 3.0f );
        D3DXMatrixMultiply( &m_matView, &m_matView, &matTrans );
	  m_pd3dDevice->SetTransform( D3DTS_VIEW,  &m_matView );
    }    
    m_pd3dDevice->SetTransform( D3DTS_VIEW,  &m_matView );
}


LRESULT CMyD3DApplication::MsgProc( HWND hWnd, UINT uMsg, WPARAM wParam,
                                    LPARAM lParam )
{
   // Record key presses
	if ( WM_KEYDOWN == uMsg )
	{
		m_bKey[wParam] = 1;
	}

	// Capture mouse when clicked
    if( WM_LBUTTONDOWN == uMsg )
    {
        D3DXMATRIXA16 matCursor;
        D3DXQUATERNION qCursor = D3DUtil_GetRotationFromCursor(m_hWnd );
        D3DXMatrixRotationQuaternion( &matCursor, &qCursor );
        D3DXMatrixTranspose( &matCursor, &matCursor );
        D3DXMatrixMultiply( &m_matTrackBall, &m_matTrackBall, &matCursor );

        SetCapture( m_hWnd );
        m_bCapture = TRUE;
        return 0;
    }
	
	if( WM_LBUTTONUP == uMsg )
    {
        D3DXMATRIXA16 matCursor;
        D3DXQUATERNION qCursor = D3DUtil_GetRotationFromCursor( m_hWnd );
        D3DXMatrixRotationQuaternion( &matCursor, &qCursor );
        D3DXMatrixMultiply( &m_matTrackBall, &m_matTrackBall, &matCursor );

        ReleaseCapture();
        m_bCapture = FALSE;
        return 0;
    }
    
	return CD3DApplication::MsgProc( hWnd, uMsg, wParam, lParam );
}