How to detect collision when Time.timeScale == 0?

Question

So I have my Time scale set to 0 while paused in my bullet hell game. When un-pausing I want to force the player to return the mouse to their previous position so they can't just teleport via pausing. I'm doing this by creating a "ghost" at the player position (player follows mouse btw), then when the player unpauses, the timescale stays one until the player returns to the ghost position.

The problem is that at timescale 0 no collisions are detected! I have this attached to the ghost object

 private void OnTriggerEnter2D(Collider2D collision)
     {
         print("collision");
         if (collision.gameObject.tag.Equals("Player"))
         {
             Time.timeScale = 1f;
             Destroy(gameObject);
             PauseMenu.Paused = false;
         }
     }

So yeah. How do I detect collisions when timescale = 0?

Answer 1

Best Answer

Answer by Ermiq · Dec 09, 2019 at 11:47 AM

As far as I know, you can't do that via collision detection.

Instead, you can use raycasting to compare the ghost position and the mouse position (raycasting works with timescale 0). For example:

 RaycastHit hitInfo;
 if (Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), hitInfo))
 {
     if (hitInfo.gameObject.tag.Equals("Ghost"))
     {
          Time.timeScale = 1f;
          Destroy(hitInfo.gameObject);
          PauseMenu.Paused = false;
      }
 }

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FaerieFire · Dec 11, 2019 at 01:23 PM 0

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Thank you! I forgot to mention that Im working in 2D, but this definitely sent me down the right path. It's all working now!

Mockarutan FaerieFire · Dec 11, 2019 at 01:42 PM 0

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While this certainly works in a lot of cases, OnTiggerEnter2D is not a RayCast.

Answer 2

Answer by Mockarutan · Dec 11, 2019 at 01:42 PM

You can drive the simulation yourself explained here: https://docs.unity3d.com/ScriptReference/Physics.Simulate.html

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How to detect collision when Time.timeScale == 0?

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