# Prevent GPU Particles from entering an area, or kill them on collision

**URL:** <https://forums.unrealengine.com/t/prevent-gpu-particles-from-entering-an-area-or-kill-them-on-collision/466252>\
**Category:** FX\
**Tags:** collision-detection, gpu-particles, unreal-engine, Physics, Collision, question\
**Created:** [June 4, 2020, 5:20pm UTC](https://forums.unrealengine.com/t/prevent-gpu-particles-from-entering-an-area-or-kill-them-on-collision/466252 "2020-06-04T17:20:37Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![KeyC0de](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/keyc0de/32/1099072_2.png) [@KeyC0de](https://forums.unrealengine.com/u/KeyC0de)\
**Post date:** [June 4, 2020, 5:20pm UTC](https://forums.unrealengine.com/t/prevent-gpu-particles-from-entering-an-area-or-kill-them-on-collision/466252/1 "2020-06-04T17:20:37Z")

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I’m trying to make gpu particles be killed when colliding with a surface, mostly for rain/snow occlusion effects. However, I am unsuccessful. Is there a way to do that, without using distance fields, or will I have to resort to using CPU particles? Is there maybe another way to simulate collision, by preventing prevent particles from entering an area (say using a predefined volume placed indoors)?

I’m talking about Cascade particles, as I don’t know about Niagara.

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**Author:** ![Nino\_Mancuso](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Nino\_Mancuso](https://forums.unrealengine.com/u/Nino_Mancuso)\
**Post date:** [August 13, 2020, 9:39pm UTC](https://forums.unrealengine.com/t/prevent-gpu-particles-from-entering-an-area-or-kill-them-on-collision/466252/2 "2020-08-13T21:39:45Z")

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No reply on this yet? Trying to solve a similar problem myself

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**Author:** ![KeyC0de](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/keyc0de/32/1099072_2.png) [@KeyC0de](https://forums.unrealengine.com/u/KeyC0de)\
**Post date:** [October 9, 2020, 6:27pm UTC](https://forums.unrealengine.com/t/prevent-gpu-particles-from-entering-an-area-or-kill-them-on-collision/466252/3 "2020-10-09T18:27:39Z")

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yup no reply unfortunately