Generate lightmap UVs taking forever

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So, I've finally found my problem when baking my light : my mesh had lightmap UVs all wrong.

I imported a model from Google Sketchup, a quite simple building, not very detailed either. I've tried baking the light and realized something was off : black marks over the textures here and there, really ugly stuff. After browsing hours between the whinning about Enlighten being not as good as Beast for baked lightmap, I finally found out that what I was missing was generating lightmap UVs.

I've tried doing that on a small sample project with a 20 poly SU model, evrything was fine. It took a little time to calculate the lightmap UVs and some more time to bake the light and that was it.

So I tried doing just that for my model, but the thing is that generating the lightmap UVs takes forever. It freezes Unity in the process too : I can't even open it, it's stuck loading.

I'm using : Google Sketch Up Make 2016 (free version), Unity 5.3.4f1 32 bit and I'm on Windows 7.

Bottom line is the following questions : Is this normal? Do I have to wait longer than one hour? Why are there no progress bar of what's happening? Did anyone also encounter this problem on this version of Unity? Is there a solution (possibly other than mapping the light UVs myself)?

Answer 1

Answer by ViniCassol · May 26, 2021 at 11:01 PM

Same here, in 2021 :(

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Answer 2

Answer by GuardFromUA · Jul 04, 2017 at 07:51 AM

Faced this problem too... I can't see even the progress bar, but can view new UnwrapCL process in the windows inspector. I was waiting for a loooong time and nothing happened. Did you find the solution?

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DorianF · Jul 04, 2017 at 08:23 AM 0

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Sorry, I haven't used Unity in a while now, I can't remember well.

For this problem, I think it was slow because 1 - $$anonymous$$y model was complex 2 - $$anonymous$$y PC wasn't good enough 3 - (and that might be what you are looking for) : my baking parameters were too high.

The main thing to change in the baking settings is the "baked resolution", wich defaults to 40.

Whenever you are testing, you should set it to 2~4 (and even then, it's a bit slow). The result is absolutely UGLY, but you get an idea of wich piece is properly lit and wich isn't.

Only during your final baking will you set it at 40~80, and you might want to let your computer deal with that during your sleep or something. Definitely not something you'll wait behind your computer (and you won't be able to run anything requiring your GPU).

I hope this helps.

Generate lightmap UVs taking forever

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