# Why particles are shaking?

**URL:** <https://forums.unrealengine.com/t/why-particles-are-shaking/2657459>\
**Category:** Blueprint\
**Tags:** particle-systems, unreal-engine, question\
**Created:** [September 17, 2025, 8:10am UTC](https://forums.unrealengine.com/t/why-particles-are-shaking/2657459 "2025-09-17T08:10:14Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![zucchini\_ue](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@zucchini\_ue](https://forums.unrealengine.com/u/zucchini_ue)\
**Post date:** [September 17, 2025, 8:10am UTC](https://forums.unrealengine.com/t/why-particles-are-shaking/2657459/1 "2025-09-17T08:10:14Z")

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![20250917-160423](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/3/a/73a273466d6298db5075bc75e4f62ee08bbcf1a3.jpeg)

 ![20250917-160706](https://d3kjluh73b9h9o.cloudfront.net/original/4X/a/8/f/a8f6bba856a5079b7cd9cc81547b35d8dd777119.jpeg)

I used neighbor grid to simulate collision between particles. But each particle had a small shake like someone was knocking the table!

Why and how to fix it?

I upload a GIF here.

![Adobe Express - CoffeBean - 虚幻编辑器 2025-09-17 16-15-24](https://d3kjluh73b9h9o.cloudfront.net/original/4X/a/7/a/a7ac69308be0f943e54b6f2bcfa2e3a207607dd6.gif)

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**Author:** ![BRGEzedeRocco](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/brgezederocco/32/1216890_2.png) [@BRGEzedeRocco](https://forums.unrealengine.com/u/BRGEzedeRocco)\
**Post date:** [September 17, 2025, 5:36pm UTC](https://forums.unrealengine.com/t/why-particles-are-shaking/2657459/2 "2025-09-17T17:36:22Z")

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Hello @zucchini_ue ,  
I found this Epic tutorial that explains particle collisions using Neighbor Grid quite well:

> **[Unreal 5.3 - Inter particle collision and neighbor grids explained |...](https://dev.epicgames.com/community/learning/tutorials/Jpoa/unreal-engine-fortnite-unreal-5-3-inter-particle-collision-and-neighbor-grids-explained)**
>
> In this video I'll show a step by step guide on how to make particles collide with each other in Niagara, using Neighbor grids and simple rigid body dyn...

At this minute (33:20) he starts talking about collisions

[![](https://d3kjluh73b9h9o.cloudfront.net/original/4X/e/4/9/e49c81c105e2ce0718fa8921bc19b8968c75bcef.jpeg "Unreal 5.3 - Inter particle collision and neighbor grids explained (FULL TUTORIAL)") ](https://www.youtube.com/watch?v=wfWy08DbmYM&t=2003)

The video shows how to set up collisions step by step, it might help you compare with your setup and see if that makes the shake disappear.

I also found this other one on YouTube:

- [Niagara Neighbor Grid Tutorial](https://www.youtube.com/watch?v=82asza6Kv24)

It goes into more detail about how the grid works and how to configure it, It’s not exactly what you’re looking for, but it’s interesting because it shows several tricks and details that help you better understand how the system behaves.

Hope it helps!