2D (look at) object disappears (619335)

2D
1

I have a moving object that I want to look at the target it’s moving towards, here is my code:

void Update ()
{
    transform.LookAt( target.transform.position);
}

The problem is the object does look at the target while moving, but it disappears from the screen, but it’s there at the same time :face_with_spiral_eyes:

2

lookat is for 3d, and it is using z-axis (you can rotate your sprite at 90 on y-axis(not sure), so you cannot see them in editor).

try something here

1 Like
3

Agree with @vakabaka .

I use this code to make 2D objects face a point:

        public static void LookAt2D(this Transform transform, Vector2 target)
        {
            Vector2 current = transform.position;
            var direction = target - current;
            var angle = Mathf.Atan2(direction.y, direction.x)*Mathf.Rad2Deg;
            transform.rotation = Quaternion.AngleAxis(angle, Vector3.forward);
        }
4 Likes
4

Thank you, that works perfect. On other note, I think there are some 3D functions in unity that needs 2D versions.

5

How do I add speed to that?

6

do you mean rotate speed ? Calculate angle and rotate gameobject with needed speed. Something like this

public float rotateSpeed;

void Update()
{
Vector2 dir = enemy.transform.position - transform.position;
float angle = Vector2.Angle(transform.right, dir);
if (angle > 0.5f)
{
float rDir = Mathf.Sign(Vector2.SignedAngle(transform.right, dir));
transform.Rotate(Vector3.forward * Time.deltaTime * rDir * rotateSpeed);
}
}

last time I am using this:

Vector3 dir = target.transform.position - transform.position;
gameObject.transform.right = dir;
2 Likes
7

Just curious how does this work?

8

How do you use this? My Class name highlights in red when i add it to my script

9

I did it with the following code, note that I didn’t need the character to be rotated towards the target so a simple sprite flip was enough for me based on where the transform was compared to the target transform.

float lookAtDirection = target.position.x - transform.position.x;

if(lookAtDirection < 0 )
{
    // if sprite is looking at right flip else do nothing
    this.GetComponent<SpriteRenderer>().flipX = true;

}
else if(lookAtDirection > 0 )
{
    // if sprite is looking at right do nothing else flip
    this.GetComponent<SpriteRenderer>().flipX = false;

}