unity know when gameobject presed
void Update () {
if (Input.GetMouseButtonDown(0)) {
CastRay();
}
}
void CastRay() {
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
RaycastHit2D hit = Physics2D.Raycast (ray.origin, ray.direction, Mathf.Infinity);
if (hit.collider !=null) {
Debug.Log (hit.collider.gameObject.name);
}
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