enum CameraType{	FPS_CAMERA,	FOLLOW_CAMERA,	ARCBALL_CAMERA,	UNKNOWN_CAMERA};class CCamera{public:	CCamera() { m_CameraType = UNKNOWN_CAMERA; }	virtual ~CCamera() {}	D3DXMATRIX SetViewMatrix(D3DXMATRIX &mat) { m_matView = mat; }	D3DXMATRIX* GetViewMatrix() { return &m_matView; }	D3DXMATRIX SetBillboardMatrix(D3DXMATRIX &mat) { m_matBillboard = mat; }	D3DXMATRIX* GetBillboardMatrix() { return &m_matBillboard; }	void SetPosition(float x, float y, float z) { m_vPosition = D3DXVECTOR3(x,y,z); }	D3DXVECTOR3 GetPosition() { return m_vPosition; }	CameraType	GetCameraType() { return m_CameraType; }	  	virtual void Update(float fElapsedTime) = 0;	virtual void Reset() = 0;protected:	D3DXMATRIX	m_matView;	D3DXMATRIX  m_matBillboard;	D3DXMATRIX	m_matOrientation;	D3DXVECTOR3 m_vPosition;	CameraType	m_CameraType;};  

  class CUserControlledCamera : public CCamera{protected:	D3DXVECTOR3 m_vVelocity;	float m_fYaw;	float m_fYawVelocity;	float m_fPitch;	float m_fPitchVelocity;	float m_fRoll;	float m_fRollVelocity;	float m_bInvertYAxis;	float m_fSpeed;	float m_fAngularSpeed;	float m_fDeceleration;	float m_fAngularDeceleration;public:	CUserControlledCamera();	virtual ~CUserControlledCamera();	void SetInvertYAxis(bool inv) { m_bInvertYAxis = inv; }	void ToggleInvertYAxis() { m_bInvertYAxis = !m_bInvertYAxis; }	void AddToYawPitchRoll(float fYaw, float fPitch, float fRoll);	void AddToVelocity(float x, float y, float z);	void Update(float fElapsedTime);	void Reset();};  

  #include "CUserControlledCamera.h"CUserControlledCamera::CUserControlledCamera(){	m_CameraType = FPS_CAMERA;	Reset();}CUserControlledCamera::~CUserControlledCamera(){}void CUserControlledCamera::Reset(){	m_vVelocity.x = 0.0f;	m_vVelocity.y = 0.0f;	m_vVelocity.z = 0.0f;	m_fYaw = 0.0f;	m_fPitch = 0.0f;	m_fRoll = 0.0f;	m_fYawVelocity = 0.0f;	m_fPitchVelocity = 0.0f;	m_fRollVelocity = 0.0f;//	m_fSpeed = 3.0f;//	m_fAngularSpeed = 1.0f;	m_fSpeed = 1.0f;//	m_fDeceleration = 0.97f;//	m_fAngularDeceleration = 0.75f;	m_fDeceleration = 0.9f;	m_fAngularDeceleration = 0.8f;	m_bInvertYAxis = false;	m_vPosition = D3DXVECTOR3(0.0f,0.0f,0.0f);	D3DXMatrixIdentity(&m_matOrientation);	D3DXMatrixIdentity(&m_matBillboard);}void CUserControlledCamera::Update(float fElapsedTime){	float fTime;  	if( fElapsedTime > 0.0f ) fTime = fElapsedTime;	else                      fTime = 0.05f;	float fSpeed        = m_fSpeed * fTime;	float fAngularSpeed = m_fSpeed * 0.3f * fTime;  	// Update the position vector	D3DXVECTOR3 vT = m_vVelocity * fSpeed;	D3DXVec3TransformNormal( &vT, &vT, &m_matOrientation );	m_vPosition += vT;	// keep the position locked in the vertical//	D3DXVECTOR3 pos = GetPosition();//	pos.y = 5.00f; //	SetPosition(pos.x,pos.y,pos.z);  	// Update the yaw-pitch-rotation vector	m_fYaw += fAngularSpeed * m_fYawVelocity;	if(m_bInvertYAxis)		m_fPitch -= fAngularSpeed * m_fPitchVelocity;	else		m_fPitch += fAngularSpeed * m_fPitchVelocity;  	// Set the view matrix	D3DXQUATERNION qR;	D3DXQuaternionRotationYawPitchRoll(&qR, m_fYaw, m_fPitch, m_fRoll);	D3DXMatrixAffineTransformation(&m_matOrientation, 1.25f, NULL, &qR, &m_vPosition );	D3DXMatrixInverse( &m_matView, NULL, &m_matOrientation );	// Decelerate the camera''s position velocity (for smooth motion)	m_vVelocity      *= m_fDeceleration;	// decelerate the abgular velocity (mouse look)	// if you raise this value too much you''ll barf	m_fYawVelocity   *= m_fAngularDeceleration;	m_fPitchVelocity *= m_fAngularDeceleration;	// update the billboard matrix	D3DXMatrixInverse( &m_matBillboard, NULL, &m_matView );	m_matBillboard._41 = 0.0f;	m_matBillboard._42 = 0.0f;	m_matBillboard._43 = 0.0f;}void CUserControlledCamera::AddToYawPitchRoll(float fYaw, float fPitch, float fRoll){	m_fPitchVelocity	+= fPitch;	m_fYawVelocity		+= fYaw;	m_fRollVelocity		+= fRoll;}void CUserControlledCamera::AddToVelocity(float x, float y, float z){	m_vVelocity += D3DXVECTOR3(x,y,z);}  

  //---------------------------------// MOUSE// mouse look with cameramx = mouse->getMouseX();my = mouse->getMouseY();camera->AddToYawPitchRoll(mx/0.8f, my/0.8f, 0.0f);//---------------------------------// KEYBOARD// keyboard arrow keys to translate cameraif(keyboard->KeyIsDown(DIK_LSHIFT)|| keyboard->KeyIsDown(DIK_RSHIFT))	cameraSpeed *= 2;if(keyboard->KeyIsDown(DIK_LCONTROL) || keyboard->KeyIsDown(DIK_RCONTROL))	cameraSpeed *= 10;		if(keyboard->KeyIsDown(DIK_LEFTARROW))		camera->AddToVelocity(-cameraSpeed,0,0);if(keyboard->KeyIsDown(DIK_RIGHTARROW))		camera->AddToVelocity(cameraSpeed,0,0);if(keyboard->KeyIsDown(DIK_UPARROW))		camera->AddToVelocity(0,0,cameraSpeed);if(keyboard->KeyIsDown(DIK_DOWNARROW))		camera->AddToVelocity(0,0,-cameraSpeed);if(keyboard->KeyIsDown(DIK_HOME))		camera->AddToVelocity(0,cameraSpeed,0);if(keyboard->KeyIsDown(DIK_END))		camera->AddToVelocity(0,-cameraSpeed,0);