Make a rigidbody collide with this rigidbody but not that one?

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For example lets say I have 2 boxes and a sphere. I want the boxes to interact and collide with eachother but ignore the sphere so the sphere just goes through. How can I do that? From script or editor or something?

Thanks

1 Answer

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Take a look at Layer-Based Collision Detection. This allows you to specify what should collide with what:

http://unity3d.com/support/documentation/Components/Layer%20Based%20Collision%20detection.html