how to lock lightmaps ?

Development Rendering
1

Hi,

I’m looking for that answer since ages but i can’t found a way to lock/freeze lightmaps (say to lightmass to not recompute some lightmaps)
If you have a complex scene and make a simple change, i don’t want lightmass recompute everythings because it take ages…

Said you have two rooms and a door between, if i have finish the room 1 i want to lock the lightmaps to not be recomputed when i’m working on room2, because room 1 is finished…
switching all objects from static to movable is not a solution

is there a way ? it’s very frustrating

thanks very much for helping

2

As one of Unreal Engine developers said, it is possible to turn off visible flag for objects, then those objects would not be baked and only visible objects will be baked. I will try to experiment with this today, I am suffering too from baking entire 5x5 km level.

3

its not an idea because if you hide some objects, like a roof or a wall, light come inside …
I just want to say to lightmass : “hey guys, don’t redrawn my lightmap, she’s good, job’s done ! !”

4

This is quite difficult question for me also, I hope someone from UE developers will shed the light on this question=)

5

If you rebuild lighting it will rebuild the entire scene. There isn’t a way to tell it not to rebuild only parts of the scene.

6

Oh sad news… it’s one of the first things i naturally look at about lightmaps…
It could be very nice to add a “lock lightmap for this object” flag

thank you for answer

7

oh yes…im suffering from the same workflow issue as well…especially if i only want to experiment with lightmap resolutions for some parts