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Question by anigmha · May 10, 2014 at 04:28 PM · collisionrigidbodyontriggerexit

Why does OnTriggerExit2D not fire when Kinematic Rigidbody Collider exits Trigger Collider?

I have two objects:

  • Object1 has BoxCollider2D with isTrigger checked.

  • Object2 has BoxCollider2D with isTrigger unchecked and RigidBody2D with isKinematic checked.

When Object2 exits Object1, why does Object1's OnTriggerExit2D not get called? According to the Collision Action Matrix below, OnTriggerExit2D should fire.

alt text

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Answer by felixpk · May 10, 2014 at 04:37 PM

Try unchecking isKinematic and instead set Gravity Scale = 0. It worked for me

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avatar image anigmha · May 11, 2014 at 01:56 PM 0
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Unchecking is$$anonymous$$inematic does indeed work, but I want it checked. Actually, what I really want is to understand why the behavior I'm seeing is not what the Collision Action $$anonymous$$atrix is telling me.

avatar image felixpk · May 11, 2014 at 11:26 PM 0
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I don't know either sorry. But what I know that in the end it doesn't really matter if you have is$$anonymous$$inemaric checked or the gravityscale set to zero, because as far as I know it brings no disatvantages with it.

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Answer by anigmha · May 12, 2014 at 12:30 PM

Apparently this is a known issue that has been marked as "by design":

Issue Tracker: RigidBody2D with Kinematic RigidBody will not cause OnTriggerEnter2D

Someone should update the documentation then.

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