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Question by NPS · Mar 18, 2014 at 04:13 PM · collisionignorecollision

Disable all collisions but one?

Is it possible to turn off all collisions for one object except with just one other object? I.e. I want object A to only collide with object B and nothing else in the scene.

I'm looking for something like:

 Physics.IgnoreCollision(objectA, all);
 Physics.IgnoreCollision(objectA, objectB, false);
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Answer by alibatiste · Mar 18, 2014 at 04:25 PM

you can use the layer and the "Layer collision matrix" in Edit=>projetc setting=>physics

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avatar image NPS · Mar 18, 2014 at 05:48 PM 0
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That forces me to create a special layer just for this one object, right? Not a very good solution.

avatar image alibatiste · Mar 18, 2014 at 06:31 PM 0
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you still have 30 other :D. I don't see any other solution...

avatar image NPS · Mar 18, 2014 at 06:37 PM 0
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What if I have 50 such objects? :P But thx for trying. It's possible that, once again, unity just sux. :P

avatar image Siliko NPS · Sep 30, 2020 at 04:51 PM 0
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The solution of alibatiste seems good to me

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Answer by l3mon · Sep 30, 2020 at 05:37 PM

Only Alternatice I could think of is using the OnCollisionEnter() or OnTriggerEnter() functions... You could check the game object's tag in case you don't want to go for layers, but it's similar.

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