# Emissive light hidden in a multiple meshses spline **URL:** \ **Category:** Blueprint\ **Tags:** unreal-engine, question, Blueprint\ **Created:** [April 17, 2025, 1:14pm UTC](https://forums.unrealengine.com/t/emissive-light-hidden-in-a-multiple-meshses-spline/2461349 "2025-04-17T13:14:17Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![FedeDevBRS](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@FedeDevBRS](https://forums.unrealengine.com/u/FedeDevBRS)\ **Post date:** [April 17, 2025, 4:47pm UTC](https://forums.unrealengine.com/t/emissive-light-hidden-in-a-multiple-meshses-spline/2461349/2 "2025-04-17T16:47:03Z")
Hello @Seppia89, how are you? I’ve been testing what you mentioned (UE 5.4.2), and it seems that the **“Affects Indirect Lighting While Hidden”** checkbox doesn’t work properly with **Spline Mesh Components** —but it _does_ work fine with **Static Mesh Components**. A possible workaround is to **convert your splines to static meshes** , especially if your goal is just to use them for lighting and not render any actual geometry. There’s a **built-in tool** for this in the editor, and it also helps optimize by merging everything into a single mesh. Here’s a video showing how to use it: 📺 [https://www.youtube.com/watch?v=Tr8SlLqX2XM](https://www.youtube.com/watch?v=Tr8SlLqX2XM) Helpful links: 📘 Lumen & Emissive Materials: [Using the Emissive Material Input in Unreal Engine | Unreal Engine 5.5 Documentation | Epic Developer Community](https://dev.epicgames.com/documentation/en-us/unreal-engine/using-the-emissive-material-input-in-unreal-engine) 📘 About _Affects Indirect Lighting While Hidden_: [Emissive material only visible to Lumen (invisible in game)](https://forums.unrealengine.com/t/emissive-material-only-visible-to-lumen-invisible-in-game/620888?utm_source=true) Hope this info helps! Cheers 😊 --- _[View the full topic](https://forums.unrealengine.com/t/emissive-light-hidden-in-a-multiple-meshses-spline/2461349)._