AR Kit plane collisions

For some reason I cannot get collisions with ar plane anchors to occur. I have added a box collider to the debugplane prefab and am using generate planes object from the examples but any rigidbody I place goes straight through the plane object as if there are no collisions occuring.


What am I doing wrong, and how did you get collisions working for AR planes / make plane objects collidable?

EDIT: I am a professional unity developer so this is not a misunderstanding of how the physics system in unity works (such as not having rigidbodies etc etc), but I do believe it may be down to incorrect use of positions from the unity matrix ops class.

Explaining how you initially position a collidable game object, over a collidable plane anchor specifically for AR kit (any differences between this and normal placement in a non-arkit app) may help too

 

Turned out the collision plane prefab sets its y collider size to 0 when placed and running.

Made a new prefab and stopped happening.

Can lock this thread.