IEnumerator Coroutine and update issues

Questions & Answers
1

Hey guys I have been working on this procedure for over a day and I am about at the end of my sanity…

Basically I have 2 boxes, 1 is a wall and 1 is a cube. I am trying to create a tooltip that last for a few seconds and then disappears until the move leaves the object and points to it again. So far i have got the tool tip to disappear like i wanted however after numerous seconds the Coroutine starts fight with update and starts popping in and out. I read that your not supposed to start Coroutine within Update but start however i have tried both void start and IEnumerator start with zero success of the Coroutine starting (the text never fades).

I am quite new to unity and been checking out the tutorials and examples from here and various sites but at this point i am afraid i may have got myself confused or mixed up along the way and am just lost at this point. any advice or tips would be a godsend.

Here is the script I have been working with:

public GameObject textcanvas;
private int box;

// Use this for initialization
void Start()

{
textcanvas.SetActive(false);
box = LayerMask.NameToLayer(“box”);

}

// Update is called once per frame
void Update()
{
    RaycastHit hit;

    Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);

    if (Physics.Raycast(ray, out hit))
    {
        if (hit.transform.gameObject.layer == box)
        {
            StartCoroutine(fade());

            textcanvas.SetActive(true);
            print("box hit");

        }
    }
}
private IEnumerator fade()
{
    RaycastHit hit;

    Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);

    if (Physics.Raycast(ray, out hit))
    {

        if (hit.transform.gameObject.layer == box)
        {
            yield return new WaitForSeconds(3);
            {
                textcanvas.SetActive(false);
                
            }                               
        }                     
    }
}

}

2

You need to get a reference to your IEnumerator and see if it is running before calling it again like so :
(not the full code, just a guide)

IEnumerator _fade;

if (hit.transform.gameObject.layer == box)
{
         CheckFade();
         print("box hit");
 }

void CheckFade()
{
    if(_fade == null)
    {
         _fade = fade;
        textcanvas.SetActive(true);
        StartCoroutine(_fade);
    }
}

if (hit.transform.gameObject.layer == box)
{
     yield return new WaitForSeconds(3);
      {
          textcanvas.SetActive(false);
         _fade = null;           
      }                               
  }
3

instead of calling a co-routine for your delays you can try making fade a simple method

float timer = 3f;

timer -= Time.deltaTime();

if(timer <= 0)
fade();