void RotateView(float angle, float x, float y, float z)
			{
				core::vector3df vNewView;

				// Get the view vector (The direction we are facing)
				core::vector3df vView = cView - cPosition;		

				// Calculate the sine and cosine of the angle once
				float cosTheta = (float)cos(angle);
				float sinTheta = (float)sin(angle);

				// Find the new x position for the new rotated point
				vNewView.x  = (cosTheta + (1 - cosTheta) * x * x)		* vView.x;
				vNewView.x += ((1 - cosTheta) * x * y - z * sinTheta)	* vView.y;
				vNewView.x += ((1 - cosTheta) * x * z + y * sinTheta)	* vView.z;

				// Find the new y position for the new rotated point
				vNewView.y  = ((1 - cosTheta) * x * y + z * sinTheta)	* vView.x;
				vNewView.y += (cosTheta + (1 - cosTheta) * y * y)		* vView.y;
				vNewView.y += ((1 - cosTheta) * y * z - x * sinTheta)	* vView.z;

				// Find the new z position for the new rotated point
				vNewView.z  = ((1 - cosTheta) * x * z - y * sinTheta)	* vView.x;
				vNewView.z += ((1 - cosTheta) * y * z + x * sinTheta)	* vView.y;
				vNewView.z += (cosTheta + (1 - cosTheta) * z * z)		* vView.z;

				// Now we just add the newly rotated vector to our position to set
				// our new rotated view of our camera.
				cView = cPosition + vNewView;
			}

camera()	{		Position.set(0.0, 0.0, 0.0);		View.set(0.0, 1.0, 0.5);		Up.set(0.0, 0.0, 1.0);	}	void SetViewByMouse()	{	  POINT mousePosition;	  int MiddleX = 800/2;	  int MiddleY = 600/2;	  vector3d MouseDirection(0, 0, 0);	  static float CurrentRotationX = 0.0;	  GetCursorPos(&mousePosition);	  if((mousePosition.x == MiddleX) && (mousePosition.y == MiddleY))		return;	  SetCursorPos(MiddleX, MiddleY);	  MouseDirection.x = (float)(MiddleX - mousePosition.x)/100.0f; 	  MouseDirection.y = (float)(MiddleY - mousePosition.y)/100.0f;	  CurrentRotationX += MouseDirection.y;	  	  // We don't want to rotate up more than one radian, so we cap it.	  if(CurrentRotationX > 1)	  {		CurrentRotationX = 1;		return;	  }	  // We don't want to rotate down more than one radian, so we cap it.	  if(CurrentRotationX < -1)	  {		CurrentRotationX = -1;		return;	  }	  else	  {		// get the axis to rotate around the x-axis. 		vector3d Axis;		// To be able to use the quaternion conjugate, the axis to		// rotate around must be normalized.		Axis = Axis.Normalize( (View - Position).Cross(Up) );		// Rotate around the y axis		RotateCamera(MouseDirection.y, Axis.x, Axis.y, Axis.z);		// Rotate around the x axis		RotateCamera(MouseDirection.x, 0, 1, 0);	  }	}	void RotateCamera(float angle, float x, float y, float z)	{		quaternion temp, quat_view, result;		temp.x = x * sin(angle/2);		temp.y = y * sin(angle/2);		temp.z = z * sin(angle/2);		temp.w = cos(angle/2);		quat_view.x = View.x;		quat_view.y = View.y;		quat_view.z = View.z;		quat_view.w = 0;		result = (temp*quat_view)*temp.Conjugate();		View.x = result.x;		View.y = result.y;		View.z = result.z;	}	void CameraLook()	{		gluLookAt(Position.x, Position.y, Position.z, View.x, View.y, View.z, Up.x, Up.y, Up.z);	}