# Object and characters leave the trail

**URL:** <https://forums.unrealengine.com/t/object-and-characters-leave-the-trail/1812240>\
**Category:** Rendering\
**Tags:** unreal-engine, Rendering, Lighting, question\
**Created:** [April 20, 2024, 8:17am UTC](https://forums.unrealengine.com/t/object-and-characters-leave-the-trail/1812240 "2024-04-20T08:17:18Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Valdorian](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Valdorian](https://forums.unrealengine.com/u/Valdorian)\
**Post date:** [April 20, 2024, 8:17am UTC](https://forums.unrealengine.com/t/object-and-characters-leave-the-trail/1812240/1 "2024-04-20T08:17:18Z")

</div>

Hello everyone!  
If I have Lumen on, when I move objects or character is moving - there is a trail behind them.  
First of all turning the ‘Generate Mesh Distance Fields’ off in project settings helped but if moving is happening near the walls then the trail is still there. I have hardware raytracing support on.

Did anyone encountered that problem? I’ve tried changing anti-aliasing method - not working.

---

<div class="post-metadata">

**Author:** ![TheKJ](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@TheKJ](https://forums.unrealengine.com/u/TheKJ)\
**Post date:** [April 20, 2024, 9:08am UTC](https://forums.unrealengine.com/t/object-and-characters-leave-the-trail/1812240/2 "2024-04-20T09:08:19Z")

</div>

Lumen is temporal, it works by tracing(the expensive part) a fraction of pixels and rotates through the fraction over time every frame to save performance. If we trace all pixels for lighting every frame, the GPU would have a hard time remaining responsive.

It then uses TAA to smooth any noise from alternating tracing _ **directions** _ as well.  
It’s “normal”, but the [Lumen devs](https://forums.unrealengine.com/t/lumen-gi-and-reflections-feedback-thread/501108) have no solution as of now.

---

<div class="post-metadata">

**Author:** ![system](https://d3kjluh73b9h9o.cloudfront.net/original/4X/7/1/3/713c9d3f58553f0de89543d76a8a3a2779dc9fa4.png) [@system](https://forums.unrealengine.com/u/system)\
**Post date:** [May 20, 2024, 9:08am UTC](https://forums.unrealengine.com/t/object-and-characters-leave-the-trail/1812240/3 "2024-05-20T09:08:49Z")

</div>

This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.