OnCollisionStay -> contactpoints[] missing points (when used in Update)

Unity Engine
1

Hi,
i use onCollisionStay() to copy the contactPoints into another variable which i then use in update to calculate angles and some other things.
But i always miss ‘some’ points. Atleast i’m sure i miss 1 point, but in my case it’s the most important one. When i Debug.DrawRay() from within OnCollisionStay everything is there. But when i use the collisionPoints[ ] (‘cons’ in my example) (which is just a copy of Collision.Contacts) and DrawRay() some points are missing.
Why?

Thanks.

void OnCollisionStay(Collision col) {
foreach(ContactPoint c in col) {
Debug.DrawRay(c.point, c.normal); //works
}
cons = col.contacts; //see below
}

void OnCollisionExit() {
cons = new ContactPoint[0];
}

ContactPoint[] cons = new ContactPoint[0];

void Update() {
foreach(ContactPoint c in cons) {
Debug.DrawRay(c.point, c.normal); //missing atleast one important point
}
}

typed that out of my head, a typo should not be the cause.

2

Okay, i think i know why. The documentation mentions that OnCollisionStay gets called once for every object that touches the rigidbody.
So, my next question is, how can i check if one frame has passed since the last check/call?

3

I am sure one frame will always pass between checks to OnCollisionStay, i mean what are you trying to do?

4

Maybe try using a genric list?

 List<ContactPoint> cons = new List<ContactPoint>();
    void OnCollisionStay(Collision col)
    {  
        foreach (ContactPoint c in col)
        {
            Debug.DrawRay(c.point, c.normal); //works
            if(!cons.Contains(c))
                cons.Add(c);
        }
    }

    void OnCollisionExit()
    {
        cons.Clear();
    }

    void Update()
    {
        foreach (ContactPoint c in cons)
        {
            Debug.DrawRay(c.point, c.normal); //missing atleast one important point
        }
    }