Sorry for the delay.
- To have some notable and easily quantifyable distance between the two datapoints when adding a new value. You don’t need to actually use powers of two for your own presets.
- Once you’ve created/selected your preset and checked the settings you want to use, just hit apply while the level you want to change the lightmaps for is loaded. Once you’ve got a preset and settings set up the way you want, you could basically just hit apply in every level you want to use the same settings for.
- They’re basically there to tell AutoLightmapUEr what meshes have already been changed, and if you started with ignore turned on, they’re used to tell it which meshes already had their own lightmap settings and should therefor not be touched by ALM.
- Lightmap settings are normally only changed on mesh actors in a level. “Deep” edits the min lightmap resolution for all LODs to be the required lightmap setting or less instead of the 64 that’s there by default in the actual mesh sources themselves.