Trouble triggering when player is in a very specific spot.

Unity Engine
1

The player controls a physics ball and for traps I would like events to start when the ball in on a very specific place.

If I use Ontrigger, it will fire on touch, and adding a delay is no solution because the player might have changed his mind and move in the opposite direction, or have a to slow/high speed fo my trap timing is off and kills the player when he is not trapped at all.

So is there a way to check if the middle of the sphere collider is in the trigger before it fires,
or perhaps like halflife2 a trigger that fires when the player (collider) is completely entered the trigger volume?

2

Make smaller triggers and larger trap effect areas or you could always make a double trigger trap… have a small inner trigger that’s disabled and a larger outter trigger. The ontrigger for the outter enables the inner and the inner does whatever you want ensuring the player is inside the trap area.

3

How’s this?

function OnTriggerStay( other : Collider ) {
  if ( /* other is the player */ ) {
    if ( Vector3.distance( other.transform.position, transform.position ) < 1 ) {
      Debug.Log("Triggered");
    }
  }
}
4

Thanks thats very helpfull.

I want to go a bit further and check the distance between position.z,
not sure how to do this.
(thisPlayer.transform.position.z - transform.position.z) < 0.1
That only works when on the positive plane side.

5

Use the absolute value of the difference for the comparison, rather than the distance itself.

Also note that if you’re relying on the object position being within some distance of a specific point, if the object is moving fast enough relative to the time step, it may ‘tunnel through’ the trigger area. That may not be a problem in your particular case, but it’s something to be aware of.

6

Thanks.

And for anyone stumbling on this topic:

if(Mathf.Abs(thisPlayer.transform.position.z - transform.position.z) < 0.1)