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Question by richtw · Apr 08, 2013 at 02:14 PM · collisiongameobjectoncollisionenter

Collision.gameObject doesn't necessarily return the GameObject whose collider we are colliding with - implementation bug or documentation bug?

The documentation states Collision.gameObject returns the GameObject whose collider we are colliding with. However, in the case that the collider is attached to a child whose parent contains the Rigidbody, Collision.gameObject actually returns the parent (i.e. the GameObject which contains the Rigidbody which is managing the collider).

Is this behaviour a bug, or is the documentation incorrect? I don't want our game to start behaving differently if this behaviour is changed in line with the documentation in a future version of Unity.

Thanks.

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avatar image Fattie · Apr 08, 2013 at 02:16 PM 1
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colliders belong to the rigidbody up the chain

you're right the doco could be even more clear - but that's true of all doco

It is staggeringly unlikely you would have found such a basic bug in easily the world's most popular, most deeply developed, most used game engine - don't you think realistically ??

avatar image richtw · Apr 08, 2013 at 02:59 PM 0
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No need to be patronising! Since the observed behaviour is at odds with the documentation, I was just hoping for some clarification from one of the Unity devs. It's frustrating when a working project breaks due to an engine update changing the behaviour of an API, as I know all too well from Unreal Engine.

To address your final point, basic bugs can and do creep into major releases, so to deem it "staggeringly unlikely" seems a little over-the-top. I was even bitten by such a bug in Unity just the other day (enabling mesh compression causing dynamic batching to stop working).

avatar image sdgd · Apr 08, 2013 at 03:47 PM 0
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I don't understand you use years of developing on 1 game than you update the engine and you don't even know what you update and what for

everything worked before I never see a reason to update a system untill it's broken ESPECIALLY WINDOWS I hate them and I format them when they break as they aren't STABLE - they never were

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