Recreated a .umap and its less than 1/10th the original size?

Community Community & Industry Discussion
1

I have a small startmap as a loading environment. It’s small so the game loads up quickly. But over time as i have worked on the map it has increased in size. Last time I tested, it was 40MB. and took longer than I had hoped to load when cooked.

So… I created a blank new map, copied all the actors across, added the level blueprint code, and rebuilt all the lighting to ensure it represented the same state. Since I had instanced foliage which I was unable to duplicate, I had to manually recreate the foliage to look very similar. Luckily not much. So now it looks and works identically to the initial map.

Old map - 40MB
New map - 1.4MB

Wha?

I cant find any difference… and this is worrying for me… is there garbage building up in the umap file?
Is there any way to easily enumerate the contents of a umap and see what might be different?

I have other MUCH larger maps that would benefit from this treatment… but they have a lot of foliage… and that’s a lot of rework…

I haven’t seen any “map rebuild” or “clean” functions… thought this happened automatically.

Anyone can help?

2

Just further to this… looking back through perforce history on one of my larger maps… and the size jumps around a bit… at one point it was 280MB then it jumped down to 80MB and has been there for a while… I dont recall making any obvious reduction in map content to that extent at that stage… in fact between those two version i as actually adding stuff…?

3

It could be lightmaps from baked lighting, those really add to the map size.

4

Yup, that was my first thought, but both have been baked.