OnTriggerStay Doesn't work if not moving

Questions & Answers
1

Hello,

if I instantiate a sphere with a trigger collider “inside” of a wall, it doesn’t happen what is supposed to happen.

If I instantiate the sphere outside of the wall and move it into the wall, it works.

Why, and how can I solve it?

3

I know I am way too late for this… but just in case anyone stumbles upon the same problem here’s what worked for me.

I solved it by calling the rigidbody and applying a foce of zero to it inside the void Update, that way it won’t go to sleep.

In my case was for a 2D game so it ended up looking like this:

Rigidbody2D rb;

// Update is called once per frame
    void Update()
    {
        rb.AddForce(Vector2.zero);
    }

I bet there’s better ways to do this but this one is really simple and works for a fast and easy fix.

2

Review all the conditions on the Rigidbody Sleeping page. Are your objects set up correctly with rigidbodies or static colliders? Given your description, the sphere should probably be a static collider marked Is Trigger, and the sphere should have a rigidbody.

If you instantiate one collider inside another, it will not register OnTriggerEnter messages, but it should register OnTriggerStay.