Auto-Lightmap-Adjuster

UE4 & Unity plugin to automatically adjust lightmap scale for meshes in your scene

In both Unity and Unreal, adjusting the lightmap scale of various meshes in your scene is a necessary yet always tedious process. With lightmap stitching and denoising algorithms like Optix coming in, lightmap resolutions required for good-looking lightmaps are a lot lower than they used to be, and as fast at the lightbakes are in a well-optmized game engine scene adjusting arcane numbers or resolutions to reduce noise isn't really the most productive use of one's time.

With this engine-agnostic plugin, correct lightmap resolution for your meshes is now one click away, with the package offering various resolutions depending on the engine use case.

Usage - Unity

The package installed, simply navigate to the new Tools/Adjust Lightmap Scale menu items and select your resolution:

• Mobile is good for preview renders or mobile games (duh).
• Desktop and Consoles is what's going to work best for probably most game or cutscene usecases, it's a good tradeoff between resolution and memory.
• Film & TV rendering is for real-time render stuff or cutscenes - unless you're running an RTX rig you're going to have a bad time having this in a game.

Usage - Unreal

The plugin installed, simply navigate to the new Windows/Lightmap Scale menu bar items and select your resolution:

• Performance is good for preview renders or mobile games (duh).
• Balanced is what's going to work best for probably most game or cutscene usecases, it's a good tradeoff between resolution and memory.
• Quality is for real-time render stuff or cutscenes - unless you're running an RTX rig you're going to have a bad time having this in a game.

Install process

The repository is split for the two engines: the Plugin folder's for Unreal and the Packages folder for Unity.

Unity 2019.2

This is a plugin that makes use of Unity's Package Manager feature. Just drop the com.alexismorin.autolightmapadjuster folder into your packages folder (found at the same level as the Assets folder) and it should work out-of-the-box. If you're using a pre-packman version of Unity (maybe supported, can be made to work if you're courageous), take the stuff inside the com.alexismorin.autolightmapadjuster folder and then drag it anywhere into your regular project hierarchy.

Unreal 4.22

Just drag the AutoLightmapAdjuster folder into your project's Plugins folder (create it at the same level as your content folder if you don't have one already) and open your project - things should work out by themselves.

Per usual, this was whipped up in a couple of hours on my couch - bugs beware, tweak or fork as you wish.

Bugs

• Unreal will sometimes not refresh the new lightmap sizes; just select all the static meshes in the scene and toggle on and off the override setting - that'll fix it.