UE5 Optimisation: How To Find And Fix Lightmap Densities

Hey guys, in today's video I'm going to be showing you how to view the lightmap density of meshes in your scene and how to modify them to increase performance in your Unreal Engine projects and games, as well as fixing a potential crash you may get when building the lighting.

#UE5 #UnrealEngine5 #UE5Tutorial
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To access the project files and screenshots from the video, check out my Patreon above!

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♫ Outro Song: Kronicle - Chill Noons

[Pierraxl]

Just to answer everybody about lumen, this tutorial is irelevant if you use lumen. Here is a list of disabled system by lumen
- Lightmaps
- Lightmass portals
- Lightmass volume
- Ambient occlusion
- Reflection captures
- lightmap UV
- light functions
- Distance field

[TygerTwo]

I freakin love your channel, dude. Every video is clear and concise. Whenever I'm searching some UE topic to solve a problem, I'm so glad and relieved when one of your videos pops up because they are always helpful and so easy to watch/listen to. Thanks a million.

[KomodoBitGames]

I’m about to start work on optimizing my open world level so this was right on time. I’ve been doing unreal for 2 years now and I am just now learning about this

[arrowsdev]

nice, quick and right to the point, much love <3

[pixelasm]

Thanks for sharing the tip, although I wonder if there is an automated way to do this. As the engine is able to detect the lightmap densities and render each mesh accordingly it must have the info what value could be optimal per mesh. At least this could give a good start and leave fine tuning to the user for when the player is meant to interact with one or the other object more closely ...

[.st]

I think that this tutorial will help me to fix my project essue i will try when i finish some works

[PatrickTheDM]

Awesome, you just gave me a ton of work to to to Mazemerizz! (I finally named the game) Edit: Well not as bad as I thought. I only had to change a handful of lightmaps on a few levels.

[RiverFox_YT]

does this work for instanced static meshes? because they all show as black?

[apterous]

what kind of lights is the scene using?

[ProjectionistYT]

so was there ever a reason on why they decided to remove the lightmap density option from UE5?

[Ervins_from_Latvia]

I wonder, is there any way to select all 'reds' and lower the value in bulk? Some sort of 'smart filter' or something?

[PaburoVIII]

Can I use lumen and ray tracing? I broke my escene and many normal msps became pink and some models kinda broke the normals any idea how can I fix it?

[sasbando]

hi mat great video, i have a grass mesh used in grass types, is there a way i can do this in the static mesh itself as its painted onto landscape as opposed to placed in the world. i hope this made sense haha. thanks

[DeadEndGames]

Hello Mat. How do I send you my game for when you next do a video on viewers games?

[Danha]

Do you need to build lighting before you package the game or does package game button build the lighting already?

[SketchyGameDev]

So, my game is really relying on lumen, pretty much all my lighting is from emissive materials, so it’s fully dynamic. Is this a horrible mistake? 😂

[CrypticNord]

Does Density matter if you’re using moveable lighting??

[zainophrenicgaming]

Hello, Im your Big fans, can you tell me how to add more weapon, upgrade weapon system like TLOU & how to make A.I/Enemy react to sound...

& How to try the game or play the game after finish...??

[KADstudioArchitect]

I use UE 5.4.2 and I dont have this option, even shortcut (Alt + 0) doesnt work

[hendra_winata]

Does we need to do this since we are using lumen and many more new tools?