void Camera::onMousePassiveMotion(int x, int y) 
	{
		int middleX = (int)_winWidth  >> 1;				// This is a binary shift to get half the width
		int middleY = (int)_winHeight >> 1;				// This is a binary shift to get half the height
		float angleY = 0.0f;							// This is the direction for looking up or down
		float angleZ = 0.0f;							// This will be the value we need to rotate around the Y axis (Left and Right)
		static float currentRotX = 0.0f;
		
		// If our cursor is still in the middle, we never moved... so don't update the screen
		if( (x == middleX) && (y == middleY) ) return;
		
		// Set the mouse position to the middle of our window
		glutWarpPointer(middleX, middleY);
		
		// Get the direction the mouse moved in, but bring the number down to a reasonable amount
		angleY = (float)( (middleX - x) ) / 500.0f;		
		angleZ = (float)( (middleY - y) ) / 500.0f;		
		
		// Here we keep track of the current rotation (for up and down) so that
		// we can restrict the camera from doing a full 360 loop.
		currentRotX -= angleZ;  
		
		// If the current rotation (in radians) is greater than 1.0, we want to cap it.
		if(currentRotX > 1.0f)
			currentRotX = 1.0f;
		// Check if the rotation is below -1.0, if so we want to make sure it doesn't continue
		else if(currentRotX < -1.0f)
			currentRotX = -1.0f;
		// Otherwise, we can rotate the view around our position
		else
		{
			// To find the axis we need to rotate around for up and down
			// movements, we need to get a perpendicular vector from the
			// camera's view vector and up vector.  This will be the axis.
			Vector3f vAxis = cross(_lookAt - _position, _up);
			vAxis = normalize(vAxis);
			
			// Rotate around our perpendicular axis and along the y-axis
			RotateView(angleZ, vAxis[0], vAxis[1], vAxis[2]);
		}
		
		// Rotate around the y axis no matter what the currentRotX is
		RotateView(angleY, 0, 1, 0);
	}