Collision without the use of Rigid Bodies

2D
1

This is what I would like to do as I merely want to use the colliders as a means of signalling a collision (or more precisely an overlap of the bounds). So I just added the Collider2Ds to the objects and nothing happens.

Some reading around suggests that there has to be at least a rigid body attached - lo and behold it works but it starts spinning and pushing the objects. IsKinematic doesn’t seem to let it work (no events fired) so I set the constraints to tell it not to move but then this helpful hint pops up…
2564981--178721--colliderconstraint.png

Now that sounds like a great idea! Why won’t it work then?

Can I do this without the rigid body? I come from a native coding background and I’m trying to get my head around Unity’s way of thinking without getting angry… I’d rather not do my own thing but push come to shove…

2

Your player or whatever should look like this

The objects should look this

Both objects should have colliders

3

Making all the colliders into Trigger colliders would only signal, not interact. Don’t have to freeze all the positions and rotations.

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4

You dont even need a Rigidbody2D if you are not going to move it around, a Collider2D is perfectly fine without a Rigidbody if you dont move it on the game (if you do its quite expensive).
So add a Collider2D of your choice to the gameObject, set it to trigger and use OnTriggerEnter2D() in order to detect the collision.

5

http://docs.unity3d.com/ScriptReference/Collider.OnTriggerEnter.html

6

Yes, but as it said:

, so no it´s not needed in the static object.

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