# Occlusion Fmod UE4 no work

**URL:** https://qa.fmod.com/t/occlusion-fmod-ue4-no-work/14128
**Category:** Unreal Engine
**Created:** [October 5, 2018, 10:20pm UTC](https://qa.fmod.com/t/occlusion-fmod-ue4-no-work/14128 "2018-10-05T22:20:55Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Enon813](https://avatars.discourse-cdn.com/v4/letter/e/22d042/32.png) [@Enon813](https://qa.fmod.com/u/Enon813)
#### Post date: [October 5, 2018, 10:20pm UTC](https://qa.fmod.com/t/occlusion-fmod-ue4-no-work/14128/1 "2018-10-05T22:20:55Z")

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Hello, I’m using fmod for vehicle sound, the effect that brings of occlusion for UE4 is very good all right adding the event on the map the effect works properly, but when adding an event in an actor and the actor has a collision the event does not detect the collision and does not effect the occlusion, why is this happening? .

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### Author: ![cameron-fmod](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/cameron-fmod/32/261_2.png) [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)
#### Post date: [October 9, 2018, 10:26pm UTC](https://qa.fmod.com/t/occlusion-fmod-ue4-no-work/14128/2 "2018-10-09T22:26:15Z")

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What version of FMOD and UE4 are you using?  
Have you tried using a different Trace Channel for the collision?