Question by Essexrookie · Sep 07, 2019 at 02:32 PM · c#camera 2d

How to move object side to side of screen width

Hello, I looked up a solution to move an object side to side horizontally.

 public float delta = 1.5f;
 public float speed = 2.0f;
 private Vector3 startPos;

 void Start()
 {
     startPos = transform.position;
 }

 void Update()
 {
     Vector3 v = startPos;
     v.x += delta * Mathf.Sin(Time.time * speed);
     transform.position = v;
 }

but instead of having a value "delta" I would rather it just move from the left side of the camera to the right side of the camera back & forth matter the size. How to accomplish this?

0 Show 2

DCordoba · Sep 08, 2019 at 10:01 AM 1

hello, would I suggest a complete different approximation of the solution?

    public float speed = 2.0f;

    bool back = false; //check if movement is backwards or forwards
    Vector3 destination; //objective Position, the position that current instance want to reach, on camera space (viewed from the camera)
    Vector3 Space3dDestination;

     private Vector3 startPos;

     void Start()
     {
            startPos = transform.position;
     }

     void Update()
     {
          //construct the destination, you can calculate y and z on start to optimize
          //same pos of startpoint on y axis
          destination.y = Camera.main.WorldToScreenPoint(transform.position).y;
          //z is always the distance between camera and the point
         destination.z = Vector3.Distance(Camera.main.transform.position, startPos);
          //x depends where is this instance going
         if(back)
                  destination.x = Camera.main.pixelWidth; //move left
          else
                destination.x = 0f; //move right

          //point on 3d Space 
         Space3dDestination = cam.ScreenToWorldPoint(destination);

          //move transform
          transform.position = Vector3.MoveTowards(transform.position, Space3dDestination, (Time.deltaTime * speed));

           //check if is close to destination, and change movement
           if((transform.position - Space3dDestination).sqrMagnitude < .1f){
                  back = !back;

    }