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Question by dumbat · Jun 03, 2014 at 11:27 AM · 2dcollision

OnCollisionEnter2D called once on colliding with 2 objects

I have a CircleCollider2D in a RigidBody2D, falling through the air and hitting the ground and a wall. If I hit either the ground or the wall first, OnCollisionEnter2D is called for both collisions. If I hit them simultaneously, it is called only once, for the ground. (nb it does actually bounce as expected, it's just not calling OnCollisionEnter2D as expected)

What could possibly be causing this? I thought it should be called once for each object it collides with.

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avatar image dumbat · Jun 05, 2014 at 05:41 AM 0
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NB All my gameObjects are untagged, and sit in the Default layer. None of the colliders involved are triggers. How can a rigidbody2D with circleCollider2D bounce off boxCollider2D, without a call to OnCollisionEnter2D? As it's only failing when it collides with another object simultaneously, it is likely to be related to this...

Also, I tried catching the OnCollisionEnter2D in the Wall's script, but again, it is only called if the Wall is the only object the CircleCollider2D is colliding with

avatar image Kordrann · Dec 27, 2014 at 08:44 PM 0
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Did you ever find an answer? I'm having exactly the same problem - I have a projectile bouncing across the ground, then bouncing off a wall and co$$anonymous$$g back. It triggers OnCollisionEnter2D just fine when it's hitting either the ground OR the wall, but despite the fact that physically it bounces exactly right when it hits down in the ground-wall corner (colliding with both in the same FixedUpdate), it does NOT trigger OnCollisionEnter2D for the collision with the wall.

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