Moving the cube on a surface.

Questions & Answers
1

Hello everyone. I’ve got some really hard question for me. I have a cube and some surface where it moves. And I need to move the cube anywhere on the surface by touching of the finger(the cube should follow the touch). I already have a script that makes the cube move towards the touch but when I touch the screen it falls UNDER the surface and it cannot move forward. I’m just new to Unity so I don’t have any ideas how do I do this. And also, for some reason cube always moves backwards when touching. Please help.

public GameObject cube;
public new GameObject camera;

void Update()
{
    if (Input.touchCount > 0)
    {

        Vector3 touch = (Input.GetTouch(0).position);
        if (Input.GetTouch(0).phase == TouchPhase.Stationary || Input.GetTouch(0).phase == TouchPhase.Moved)
        {
            float zDistance = cube.transform.position.z - camera.transform.position.z;
            Vector3 touchPosition = Camera.main.ScreenToWorldPoint(new Vector3(touch.x, 0, zDistance));
            transform.position = touchPosition;
        }
    }
}
2

public GameObject cube;
public new GameObject camera;
void Update()
{
if (Input.touchCount > 0)
{
Touch touch = Input.GetTouch(0);
if (touch.phase == TouchPhase.Stationary || touch.phase == TouchPhase.Moved)
{
Vector3 touchPosition = Camera.main.ScreenToWorldPoint(touch.position); //this is the world coordinate representation of your touch position. You can use this as you wish
}
}
}