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Question by gzzhongqi · Oct 06, 2016 at 11:43 PM · rigidbodyvrchild object

How to glue objects together and still getting individual collision detection?

I am just starting developing a game in VR and the effect I am trying to achieve here is similar to minicraft. I would have a bunch of cubes where I can randomly stick cubes together and take away a cube from a group of cubes. I want to be able to use the Vive controller to do this.

My current idea is that I have a parent game object which has many children objects. I want this group of objects to always move together, behaving like the parent has a rigidbody. The only problem is, if I only put the rigidbody on the parent, than I would not get individual collision detection for the children. On the other hand, I can't let the children have rigidbodies of their own as well because that breaks the physics engine. I have considered using joints as well, but I am not getting very good results. I am wondering if there is anyway of achieving what I am describing here. The number of children the parent object has would be dynamically changing in the game, so any sort of hard coding solution would not be possible. I am a new unity developer and I was really surprised that moving objects together and getting individual collision events would turn out to be so difficult.

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Answer by EpiFouloux · Oct 07, 2016 at 05:20 AM

If the Child Cubes have their own Colliders, You can access the specific collisions whit the hitpoints :

 foreach (ContactPoint contact in collision.contacts)

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