Rotation

    
// Rotate camera on arrows

	float		fRotSpeed = DEG_PS * DEG * FRAMERATE_S;
	D3DXVECTOR3	v = m_pCamera->GetPos();
	D3DXVECTOR3	u = m_pCamera->GetUp();
	D3DXVECTOR3	d = m_pCamera->GetDir();

	//

	// Camera look

	//

	if( m_pSettings->bMouseInput )		// Mouse look

	{
		D3DXVECTOR3	vAxis;

		// Left and right

		D3DXMatrixRotationY( &mat, m_pMouse->XAxis() * fRotSpeed );
		D3DXVec3TransformCoord( &d, &d, &mat );
		D3DXVec3TransformCoord( &u, &u, &mat );

		// Up / down

		D3DXVec3Cross( &vAxis, &d, &u );
		D3DXVec3Normalize( &vAxis, &vAxis );
		D3DXMatrixRotationAxis( &mat, &vAxis, m_pMouse->YAxis() * -fRotSpeed );
		D3DXVec3TransformCoord( &d, &d, &mat );
		D3DXVec3TransformCoord( &u, &u, &mat );
	}
	else				// Keyboard look

	{
		// Left and right

		if( m_pKeyboard->KeyDown( DIK_LEFT, 0 ) )
		{
			D3DXMatrixRotationY( &mat, -fRotSpeed );
			D3DXVec3TransformCoord( &d, &d, &mat );
			D3DXVec3TransformCoord( &u, &u, &mat );
		}
		if( m_pKeyboard->KeyDown( DIK_RIGHT, 0 ) )
		{
			D3DXMatrixRotationY( &mat, fRotSpeed );
			D3DXVec3TransformCoord( &d, &d, &mat );
			D3DXVec3TransformCoord( &u, &u, &mat );
		}

		// Up and down

		if( m_pKeyboard->KeyDown( DIK_UP, 0 ) )
		{
			// Rotate about the axis perpendicular to the line of sight and the up vector

			D3DXVECTOR3	vAxis;
			D3DXVec3Cross( &vAxis, &(m_pCamera->GetDir()), &(m_pCamera->GetUp()) );
			D3DXVec3Normalize( &vAxis, &vAxis );

			D3DXMatrixRotationAxis( &mat, &vAxis, -fRotSpeed );
			D3DXVec3TransformCoord( &d, &d, &mat );
			D3DXVec3TransformCoord( &u, &u, &mat );
		}
		if( m_pKeyboard->KeyDown( DIK_DOWN, 0 ) )
		{
			// Rotate about the axis perpendicular to the line of sight and the up vector

			D3DXVECTOR3	vAxis;
			D3DXVec3Cross( &vAxis, &(m_pCamera->GetDir()), &(m_pCamera->GetUp()) );
			D3DXVec3Normalize( &vAxis, &vAxis );

			D3DXMatrixRotationAxis( &mat, &vAxis, fRotSpeed );
			D3DXVec3TransformCoord( &d, &d, &mat );
			D3DXVec3TransformCoord( &u, &u, &mat );
		}
	}

	//

	// Move camera

	//


	// Move forward and back

	if( m_pKeyboard->KeyDown( DIK_W, 0 ) )
	{
		D3DXVECTOR3 vec;

		// Restrain camera to x/z movement only if flag is not set

		if( !m_pSettings->bFreeMove )
		{
			vec = m_pCamera->GetDir() * MOVE_SPEED_FIXED;
			vec.y = 0.0f; //NOTE: Not doing this will introduce gimbal lock where you lose a degree of freedom

		}
		else
			vec = m_pCamera->GetDir() * MOVE_SPEED;

		v += vec;
	}
	if( m_pKeyboard->KeyDown( DIK_S, 0 ) )
	{
		D3DXVECTOR3 vec;

		// Restrain camera to x/z movement only if flag is not set

		if( !m_pSettings->bFreeMove )
		{
			vec = m_pCamera->GetDir() * MOVE_SPEED_FIXED;
			vec.y = 0.0f;  //NOTE: Not doing this will introduce gimbal lock where you lose a degree of freedom

		}
		else
			vec = m_pCamera->GetDir() * MOVE_SPEED;

		v -= vec;
	}

	// Strafe left and right

	if( m_pKeyboard->KeyDown( DIK_A, 0 ) )
	{
		// Rotate about the axis perpendicular to the line of sight and the up vector

		D3DXVECTOR3 vec;
		D3DXVECTOR3	vAxis;
		D3DXVec3Cross( &vAxis, &(m_pCamera->GetDir()), &(m_pCamera->GetUp()) );

		// Restrain camera to x/z movement only if flag is not set

		if( m_pSettings->bFreeMove )
		{
			D3DXVec3Normalize( &vAxis, &vAxis );

			vec = vAxis * MOVE_SPEED;
		}
		else
		{
			vAxis.y = 0.0f;
			D3DXVec3Normalize( &vAxis, &vAxis );

			vec = vAxis * MOVE_SPEED_FIXED;
		}

		v += vec;
	}
	if( m_pKeyboard->KeyDown( DIK_D, 0 ) )
	{
		// Rotate about the axis perpendicular to the line of sight and the up vector

		D3DXVECTOR3 vec;
		D3DXVECTOR3	vAxis;
		D3DXVec3Cross( &vAxis, &(m_pCamera->GetDir()), &(m_pCamera->GetUp()) );

		// Restrain camera to x/z movement only if flag is not set

		if( m_pSettings->bFreeMove )
		{
			D3DXVec3Normalize( &vAxis, &vAxis );

			vec = vAxis * MOVE_SPEED;
		}
		else
		{
			vAxis.y = 0.0f;
			D3DXVec3Normalize( &vAxis, &vAxis );

			vec = vAxis * MOVE_SPEED_FIXED;
		}

		v -= vec;
	}

	// Move up and down

	if( m_pKeyboard->KeyDown( DIK_NUMPAD8, 0 ) )
	{
		D3DXVECTOR3 vec;
		D3DXVec3Scale( &vec, &(m_pCamera->GetUp()), MOVE_SPEED );
		D3DXVec3Add( &v, &v, &vec );
	}
	if( m_pKeyboard->KeyDown( DIK_NUMPAD2, 0 ) )
	{
		D3DXVECTOR3 vec;
		D3DXVec3Scale( &vec, &(m_pCamera->GetUp()), MOVE_SPEED );
		D3DXVec3Subtract( &v, &v, &vec );
	}

	m_pCamera->SetPos( &v );
	
	D3DXVec3Normalize( &d, &d );
	m_pCamera->SetDir( &d );

	D3DXVec3Normalize( &u, &u );
	m_pCamera->SetUp( &u );
    

  
	m_vAt = m_vPos + m_vDir;

	//

	// Set up our view matrix. A view matrix can be defined given an eye point,

	// a point to look at, and a direction for which way is up. 

	//

	D3DXMatrixLookAtLH( &m_matView, &m_vPos, &m_vAt, &m_vUp );