# Particle System Spawned On Hit Doesn't Have Collisions

**URL:** <https://forums.unrealengine.com/t/particle-system-spawned-on-hit-doesnt-have-collisions/297969>\
**Category:** FX\
**Tags:** unreal-engine, Collision, Blueprint, question\
**Created:** [November 2, 2014, 7:56pm UTC](https://forums.unrealengine.com/t/particle-system-spawned-on-hit-doesnt-have-collisions/297969 "2014-11-02T19:56:34Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![maljkovicdusan](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@maljkovicdusan](https://forums.unrealengine.com/u/maljkovicdusan)\
**Post date:** [November 2, 2014, 7:56pm UTC](https://forums.unrealengine.com/t/particle-system-spawned-on-hit-doesnt-have-collisions/297969/1 "2014-11-02T19:56:34Z")

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Dear all,

I have made a mesh based particle system which has collision enabled. When I drag and drop it into the scene works perfectly (collisions work). Problem occurs when I add it through blueprint on a hit event. It spawns as intended but particles do not collide with the ground as they do when I drag and drop the same particle system into the scene. Here is my blueprint setup, its pretty simple:

 ![19827-particle+emiter+on+object+destroy.jpg](https://d3kjluh73b9h9o.cloudfront.net/original/4X/8/b/1/8b15e0a0219044de8b63b0af715c190f00b19673.jpeg)

Does anyone know why this happens and how can it be fixed?

Thanks,  
Dusan

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**Author:** ![Pierdek](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Pierdek](https://forums.unrealengine.com/u/Pierdek)\
**Post date:** [November 2, 2014, 8:30pm UTC](https://forums.unrealengine.com/t/particle-system-spawned-on-hit-doesnt-have-collisions/297969/2 "2014-11-02T20:30:20Z")

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If you have access to native code you can try fix this issue with this simple change:

```
void UParticleModuleCollision::Update(FParticleEmitterInstance* Owner, int32 Offset, float DeltaTime)
//comment out this condition
//if (!Actor && Owner->GetWorld()->IsGameWorld() )
//{
//	return;
//}

```

Of course this was reported and “should” be fixed in 4.5 😉

> **[Problem with collisions on mesh particles when spawning from Destructible Mesh](https://forums.unrealengine.com/questions/64067/problem-with-collisions-on-mesh-particles-when-spa.html)**
>
> I made destructible mesh of a wall. On destruction I added a particle system of some smoke and stones. Stone are particle meshes with collisions to add more details. When I spawn particle effects on level collisions work. But when they are spawned...

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**Author:** ![maljkovicdusan](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@maljkovicdusan](https://forums.unrealengine.com/u/maljkovicdusan)\
**Post date:** [November 2, 2014, 8:56pm UTC](https://forums.unrealengine.com/t/particle-system-spawned-on-hit-doesnt-have-collisions/297969/3 "2014-11-02T20:56:37Z")

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Aren’t we using a 4.5 version at the moment?

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**Author:** ![Lovecraft\_K](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Lovecraft\_K](https://forums.unrealengine.com/u/Lovecraft_K)\
**Post date:** [November 5, 2014, 3:36pm UTC](https://forums.unrealengine.com/t/particle-system-spawned-on-hit-doesnt-have-collisions/297969/4 "2014-11-05T15:36:15Z")

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Hey maljkovicdusan -

I have alerted our Engineers to this issue (UE-5011, for reference) and we will investigate this and let you know as soon as we have a solution

Thank You -

Eric Ketchum