I want to check contact between one game object (ObjA which has a box collider and a rigid body) and another game object (ObjB) which has two child game objects. The child objects of ObjB change positions slightly. I haven’t set a box collider for ObjB because I don’t need it to react to physics, I just need to tell when one object (ObjA) is in contact/touches it. How can this be done?
You will need colliders on the children, probably with the “trigger” parameter set.
Check the table at the bottom:
https
://docs.unity3d.com/Manual/CollidersOverview.html