Static object colliding

Unity Engine
1

Hi I need to know if two static objects are colliding when the code is first ran.
I tried setting:-

Rigidbody rig = GetComponent<Rigidbody>();
rig.sleepThreshold = 0.0f;

But OnCollisionEnter or OnCollisionStay are never called.
This objects do not move in game, it’s just to check a collision on the first frame.

How do I do this? I’ve tried using a trigger, but I need the collision points that I get with colliders.
Can anyone help?

2

Sorry, but static objects can’t detect anything.

3

Static objects by definition are static and do not move so they don’t detect any collisions. They sleep and let the live non-static rigidbodies handle collisions. Maybe you’re looking for Kinematic?

The Scripting Reference have examples on how to handle collisions.

4

Thanks, I haven’t set them as ‘static’ in the editor. It was an unfortunate wording on my part, sorry.
They just start off colliding, and I wanted to detect the collision point. I’ve even tried giving them a vertical velocity, but they have to be all the same to keep them together.
I think I’m going too give up and do my own detection code, it’ll be neater anyway.

5

OnCollisionEnter() works extremely well. It doesn’t get any cleaner than that. Check out the example in the Scripting Reference.

6

Thanks, it’s not getting called though, and I have rigid bodies and velocities on everything. I guess if they start off colliding then it never calls the function. Or the Stay function.

7

Yes, I believe if they start in a collided state then you’ll have some issues from the bad initialization of the rigidbodies.

8

Yeah, I’ve seen that behaviour in other game engines. I’ve just realised I need it to work in edit mode anyway. :slight_smile: