32bit vs 64bit editor Lightmapping problems

Hello,

Sorry to double post this but I would like to get as much opinions as possible.

I’ve posted a questions on Answers here:
http://answers.unity3d.com/questions/1042272/32bit-system-lightmapping-issue.html

Basically what I’m seeing is some sort of “limitation” to the maximum number of lightmaps a 32bit editor can conceivably have active for any given scene.

Within an exterior map, which will be a small town in near future, I currently have around 40 instances of houses and some 50-something instances of Walls surrounding the city, which is considerable amount of “surface” area to light bake.

Up until recently (adding in walls), complete lightbake of the map used up some 12 lightmaps of 1024x1024 size, and everything appeared OK as far as I can see.

Adding in new surface and tweaking some other settings now upped the map count to 22, and it appears that beyond a certain number, Lightmap baking simply crashes a 32bit system anyway, and when baked on more powerful system and then versioned, back on 32bit sistem it produces weird looking artifacts:

How can I avoid this? What am I doing wrong?

If any additional info is needed, I’m using a 5.0.1 editor on 32bit system. Is 5.1.1. version doing anything in regards to this issue?

If it just can’t be helped, I guess I’m nuking my entire laptop and putting 64bit system on, but that’d really be the last resort, a situation I’d like to avoid currently.

Thank you in advance for thoughts/input!

UPDATE:

Apparently it’s not the number of lightmaps.

I’ve scaled nearly all objects in the scene using Scale in UV Map option in Lighting → Object window, player around with resolution and settings, and got the bake down to 3 maps from the original 22.

Problem still present:

It’s always exact same objects, broken in exact same way (I started recognising this bracket shape of light along the house’s chimney).

The only solution appears to be re-bake on slower laptop system. What causes this? :confused:

Suppose I do re-install 64-bit OS on my laptop and install 64-bit version of Unity editor up there. Would it help the problem, or would it just be a waste of time?

EDIT: As I thought, rebaking the maps locally fixes the problem:

…but it takes 1 hour and 20 minutes to do so, while a modern Core i5 (the other machine) does it in under 10 minutes.

Seriously, I’m the only one having this problem?