# Velocity and EmitterTime from particle collision report random values **URL:** \ **Category:** FX\ **Tags:** unreal-engine, Physics, Collision, bug-report, question\ **Created:** [October 13, 2017, 9:49pm UTC](https://forums.unrealengine.com/t/velocity-and-emittertime-from-particle-collision-report-random-values/406976 "2017-10-13T21:49:56Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Jonas\_Molgaard](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Jonas\_Molgaard](https://forums.unrealengine.com/u/Jonas_Molgaard)\ **Post date:** [October 13, 2017, 9:49pm UTC](https://forums.unrealengine.com/t/velocity-and-emittertime-from-particle-collision-report-random-values/406976/1 "2017-10-13T21:49:56Z")
If you add a particle emitter, and add an Event Generator - Collision and Actor Collision Binding an event to that Particle Emitter “OnParticleCollide” will report very random values for Emitter Time, somtimes rising values with each collision, and sometimes falling values. Velocity will report 0,0,0 always, until the max number of collisions has been reached. Let me know if this needs a repro project, and i’ll set it up for you. ---
**Author:** ![anonymous\_user\_79b12e0f](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_79b12e0f](https://forums.unrealengine.com/u/anonymous_user_79b12e0f)\ **Post date:** [October 16, 2017, 3:45pm UTC](https://forums.unrealengine.com/t/velocity-and-emittertime-from-particle-collision-report-random-values/406976/2 "2017-10-16T15:45:56Z")
Hi Jonas\_Molgaard, I’m having trouble reproducing this issue on my end. Are you able to provide some more specific repro steps or a repro project so that we can look in to this issue? ---
**Author:** ![Jonas\_Molgaard](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Jonas\_Molgaard](https://forums.unrealengine.com/u/Jonas_Molgaard)\ **Post date:** [October 20, 2017, 11:24am UTC](https://forums.unrealengine.com/t/velocity-and-emittertime-from-particle-collision-report-random-values/406976/3 "2017-10-20T11:24:41Z")
Here you go. It prints out the velocity on collisions. You will see zero’s for the first 4 events and then something for the final collision. Try also add debug print for the Duration, and you will see strange values > **[Dropbox - File Deleted](https://www.dropbox.com/s/638gzbv7ct9leed/MyParticleCol.zip?dl=0)** > > Dropbox is a free service that lets you bring your photos, docs, and videos anywhere and share them easily. Never email yourself a file again! Also observe that sometimes the casing fall through the ground. ---
**Author:** ![anonymous\_user\_79b12e0f](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_79b12e0f](https://forums.unrealengine.com/u/anonymous_user_79b12e0f)\ **Post date:** [October 23, 2017, 5:51pm UTC](https://forums.unrealengine.com/t/velocity-and-emittertime-from-particle-collision-report-random-values/406976/4 "2017-10-23T17:51:42Z")
Hi, Thanks for providing that project, I can see what you mean and I have logged [JIRA UE-51529](https://issues.unrealengine.com/issue/UE-51529). Our developers will be investigating the issue further. Please follow that link to monitor the status of the report. ---
**Author:** ![Jonas\_Molgaard](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Jonas\_Molgaard](https://forums.unrealengine.com/u/Jonas_Molgaard)\ **Post date:** [October 27, 2017, 11:28am UTC](https://forums.unrealengine.com/t/velocity-and-emittertime-from-particle-collision-report-random-values/406976/5 "2017-10-27T11:28:44Z")
Hi @Jon X, i followed your link, and noticed that it’s marked as “Won’t fix”, which i can sort of accept, but is there any chance of an explanation for this? And what workarounds to use instead then? ---
**Author:** ![anonymous\_user\_79b12e0f](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_79b12e0f](https://forums.unrealengine.com/u/anonymous_user_79b12e0f)\ **Post date:** [October 27, 2017, 2:05pm UTC](https://forums.unrealengine.com/t/velocity-and-emittertime-from-particle-collision-report-random-values/406976/6 "2017-10-27T14:05:59Z")
With the recent release of engine version 4.18 our developers are focused on high priority crashes and blockers. Regarding a workaround, I will continue to investigate and post here if I find anything useful. ---
**Author:** ![The\_Revera\_Corporation](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@The\_Revera\_Corporation](https://forums.unrealengine.com/u/The_Revera_Corporation)\ **Post date:** [September 1, 2019, 8:36pm UTC](https://forums.unrealengine.com/t/velocity-and-emittertime-from-particle-collision-report-random-values/406976/7 "2019-09-01T20:36:35Z")
Hi, sorry to bring back this thread, but is there a documented workaround? And here it is backlogged more recently: > **[The Unreal Engine Issues and Bug Tracker](https://issues.unrealengine.com/issue/UE-45631)** > > Welcome to the Unreal Engine Issue and Bug Tracker. You can check the status of an issue and search for existing bugs. See latest bug fixes too.