How to display an object for just few seconds repeatedly in a scene?

Question

I am making a VR video on the working of GNSS Satellite. My scene has an Earth and a satellite which is orbiting around the Earth. I want to show signal transmission from and to the satellite with the help of arrows. But these arrows ( one pointing from satellite to earth and other pointing from earth to satellite) should be visible only for the amount of time the satellite crosses their position. How can I do that? Kindly help please

Answer 1

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Answer by Llama_w_2Ls · Jan 30, 2021 at 12:31 PM

A simpler way is using a coroutine. For example:

 public float TimeAmount;
 public GameObject arrow;
 
 void Start()
 {
      StartCoroutine(ToggleArrow(TimeAmount));
 }
 
 IEnumerator ToggleArrow(float delay)
 {
      while (true)
      {
           yield return new WaitForSeconds(delay);
           arrow.SetActive(true);
 
           yield return new WaitForSeconds(delay);
           arrow.SetActive(false);
      }
 }

@niyativirmani13

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niyativirmani13 · Feb 01, 2021 at 10:57 AM 0

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Heyy, thanks for this answer.. with this my arrow gets disappeared but how do I show it again? Suppose for now I have kept the time limit as 2 seconds. So it does go away in 2 seconds but I want it to come again and then go again and so on. It should blink

Llama_w_2Ls niyativirmani13 · Feb 01, 2021 at 11:12 AM 0

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I thought that's what my script does. It waits two seconds, sets the arrow object to active, waits two seconds, sets it to inactive, and repeats infinitely. Possibly you implemented it incorrectly?

niyativirmani13 Llama_w_2Ls · Feb 01, 2021 at 12:11 PM 0

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I dont find it implementing incorrectly.. my arrow just got disappeared after 2 seconds (which I mentioned) but it didnt re appear again

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Answer 2

Answer by MathijnG · Jan 29, 2021 at 03:45 PM

For me normally the easiest way would be to use Time.deltaTime. See here:

 float TimeAmount;
 float currentTime;
 GameObject arrow;
 
 private void Start()
 {
   currentTime = TimeAmount;
 }
 
 private void Update()
 {
   currentTime -= Time.DeltaTime;
 
   if (currentTime <= 0)
   {
     if (arrow.activeSelf)
     {
       arrow.SetActive(false);
     }
     else
     {
       arrow.SetActive(true);
     }
     currentTime = TimeAmount;
   }
 }

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niyativirmani13 · Feb 01, 2021 at 12:32 PM 0

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How do I set the time amount?

How to display an object for just few seconds repeatedly in a scene?

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