Cursor Placement
Placement would describe a few sorts of things. It would be the object placement and also the cursor placement. The first thing is the cursor placement. The object placement can be made after cursor placement. The cursor(hand) on the computer‘s screen moves following the movement of the mobile device as shown in Figure2. It can move on the 3 axes, x, y and z. To explain in detail, the cursor‘s movement on x and yaxis happens by the movement of the mobile device, but the movement on z-axis are quite differently happened by a simple type of gesture on the mobile device‘s screen. By sweeping up and down the screen
with a finger, the cursor in the virtual space goes into and comes out(along with normal vector of the screen). If you wonder if it is also possible to move the cursor by moving the mobile device by stretching the arm holding the device, the answer is yes. However, there is a reason why moving on z-axis is different from the others. The reason why sweeping gesture on the mobile device‘s screen is better is because the range of stretching human arm has a limit. To sum up the matters, the movement of the cursor on x, y-axis is happened by the movement of the mobile device, but the movement of that of z-axis is happened by simple sweeping gesture on the mobile device‘s screen. However, in fact, it is more intuitive to move the device along the direction of z-axis instead of sweeping up and down on the mobile device‘s screen. Therefore, we can suggest two options for the z-axis movement. It is possible combine the two ways. If the virtual hand is going for short distance, simply sweeping is better, but if need to go far, probably user can stretch his arm to move the virtual hand.