Unreal Engine 4 Lightmaps!!!

sbiswas

Hey guys, I was wondering how to create light map UVs unreal engine 4? I am totally new to game development and any help would be great! Thanks!

cromadbomber

You need to create a second UV set in your modeling software. You should use automatic mapping for those UVs in there. When you import your mesh in Unreal you should assign the second UV slot to the lightmap. Second UV slot has the index of 1 while the primary is 0.

sbiswas

cromadbomber wrote: »

You need to create a second UV set in your modeling software. You should use automatic mapping for those UVs in there. When you import your mesh in Unreal you should assign the second UV slot to the lightmap. Second UV slot has the index of 1 while the primary is 0.

Thanks for the info! Btw, I was searching for the the how-to create lightmap UVs and stumbled upon this - check this out!

Read the second line! It says light map UV generation is coming to UE4 as a feature!

ZacD

Automatic lightmap generation isn't as good as doing it by hand. I might work for some assets, but there is going to be other assets where you will have to do it by hand to get the best results.

Also knowing how light maps work can help you make better low poly models and modular models for UE4.

peanut™

Not too long ago i spent sometime learning LM in UE4 with other people. Have a look at http://www.polycount.com/forum/showthread.php?t=137718

Zepic

Lightmaps can be a pain...
Check out this tutorial, it shows you how to enable the LPV feature (still in beta btw). All realtime lighting.

https://www.youtube.com/watch?v=Oni6TG2DXnk

Quack!

As a side note, epic is currently investigating how to automate lightmap uv packing and plans to implement it into a future import settings feature. Something to keep an eye out for in their updates.

JordanW

YEP! Lightmap generation is coming in 4.5 and it's awesome! Internally we've been using it without problems. It's great to be able to crank out modular variants and not have to recreate lightmap UVs.