Fast bullet ignor collision sometimes

hi, i’m making a side-scroll game so the player can shoot in 2 directions, i made everything and i made a bullet with OnTriggerEnter() function to make it destroy it self if collided with triggers , its good but sometimes the bullet just keep moving and don’t destroy it self, is there any other way to do this without OnTriggerEnter(), Maybe?

Take this script and attach to your bullet prefab. then just check the layers that you want the bullet to collide with.

pragma strict

var layerMask : LayerMask; //make sure we aren't in this layer
var skinWidth : float = 0.1; //probably doesn't need to be changed
private var minimumExtent : float;
private var partialExtent : float;
private var sqrMinimumExtent : float;
private var previousPosition : Vector3;
private var myRigidbody : Rigidbody;
//initialize values
function Awake() {
   myRigidbody = rigidbody;
   previousPosition = myRigidbody.position;
   minimumExtent = Mathf.Min(Mathf.Min(collider.bounds.extents.x, collider.bounds.extents.y), collider.bounds.extents.z);
   partialExtent = minimumExtent*(1.0 - skinWidth);
   sqrMinimumExtent = minimumExtent*minimumExtent;
}

function FixedUpdate() {
   //have we moved more than our minimum extent?
   var movementThisStep : Vector3 = myRigidbody.position - previousPosition;
   var movementSqrMagnitude : float = movementThisStep.sqrMagnitude;
   if (movementSqrMagnitude > sqrMinimumExtent) {
      var movementMagnitude : float = Mathf.Sqrt(movementSqrMagnitude);
      var hitInfo : RaycastHit;
      //check for obstructions we might have missed
      if (Physics.Raycast(previousPosition, movementThisStep, hitInfo, movementMagnitude, layerMask.value))
         myRigidbody.position = hitInfo.point - (movementThisStep/movementMagnitude)*partialExtent;
   }
   previousPosition = myRigidbody.position;
}

What this does is use raycasts to avoid passing through an object.

you should use raycasts for bullet hit detection, avoid using collisions for fast moving objects…

Did you try changing the collision detection mode ?