Custom Lightmap packing

Hi,
I'm looking to modify the way Unity packs each of the Renderers into the bakd lightmap (not runtime).

It seems that when executing the Lightmap bake, unity automatically uses the "Scale In lightmap" property to modify the LightmapScaleOffset property, and then does a packing of all Renderers into as many lightmaps as needed.

1- Is it possible to make unity skip the LightmapScaleOffset generation and atlas repacking?
I want to generate a custom LightMapScaleOffset (using a custom inspector script), and force unity to use that without repacking them.
I tried modifying that variable just before baking, but unity changes its value as soon as the baking starts.
It will be of great help if there is a variable somewhere (even if had to be accessed though reflection) that disables the repacking!

2- Alternatively, is it possible to just run the repacking without doing the baking?
Ideally, I will generate the LightMapScaleOffset, but if that's not possible, its there a method to perform just the repacking.
I want to modify the "Scale In Lightmap" and do several tests to see what values are the best for each level.
Its there an exposed method that selects into which Lightmap each renderer is placed, and repacking them?

3- There used to be a property named LockAtlas that skipped the repacking.
That its now deprecated, but is there a workaround to access that same functionality?

Thanks,
Frank

 

Unless something changed really recently, I think it's no for all 3 of them (but hopefully I'm wrong).

I know I have asked for 2 many times in the past. At one point a dev said something about exposing the packing API but AFAIK that hasn't happened.

 

Been looking over the ILSpy and I guess you are right, at least I don't see any method I could call, and even the LockAtlas property its now empty.

Nonetheless, it will be great if someone from Unity could give an official answer.
Also, it will be good to know if there are plans to bring the LockAtlas property back or something similar.

 

Bump!

 

Well, it seems that no one from unity is actually reading this forum :-(
Its a shame, as a proper answer from them will actually help a lot!