OnCollisionEnter is slow...

[smirlianos]

Hello!

I have this script attached to my bullet object that is supposed to destroy it when touching a Collider, and Instantiate a particle.

The problem is that the bullet goes so fast, that the particle Instantiate not exactly the same time when the bullet collides, but a bit later, after the bullet has changed its direction from the hit, because the OnCollisionEnter function doesn’t destroy the bullet on time…

#pragma strict
var DirtHit : GameObject;

function Start () {
rigidbody.AddRelativeForce (Vector3.forward * 1000);
yield WaitForSeconds(3);
Destroy(gameObject);
}

function OnCollisionEnter (other : Collision) {
Destroy(gameObject);
Instantiate(DirtHit, transform.position, transform.rotation);
}

It has a cube collider, if this helps…

[alexanderbrevig]

Let’s say your game runs at 60 frames per second.
If we assume that the deltaTime between each frame stays stable (best case scenario) then the bullet travels 1/60 * 1000 = 16.666 units between each frame.

I would therefore use a Raycast each tick, forward more than 16.666 units. Try 20 and see what happens.

When you detect a RaycastHit, you could use the position of that hit for the DirtHit instant.

[SubatomicHero]

In the inspector have you tried altering the collision detected to either Continuous or Continuous Dynamic from Discrete?