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Building lighting on static mesh cause weird shadows


When i bake my light i get very strange artifacts on my models.

I know i need second uv channel for static models, but it doesn't help.

  • I have tried changing lightmap resolution from 64 to 256 -> no change

  • I have tried building on higher quality light settings -> no change

  • Autogenerate lightmap uv and made one myself in 3dsmax -> no change

  • change the scale of the object (someone said it is too small) -> no change

Can someone please help me, this is a major problem that i need to fix before i can move on with my map. :(

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Product Version: UE 4.12
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asked Aug 03 '16 at 03:34 PM in Using UE4

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avatar image tiago.delgrossi Aug 03 '16 at 03:52 PM


I have bumped into that issue a couple of times, most often changing the lightmap resolution to a really high value deals with it, like 1024..

But, if that's not a good solution, try to break down your model.I know this seems like a terrible idea, but it might just work, as it did for me. When you have objects with many small faces, pieces, in the UV channel, like yours, you can break it down so you have more space for the UV's.

Hope it helps.

avatar image WixZ Aug 03 '16 at 05:25 PM

Thanks for the comment but i have tried that already. I have tried multiply unwrap approaches. Nothing gives a good result.

avatar image WixZ Aug 03 '16 at 05:55 PM

I would like to add that i have done a small test to completely eliminate the cause to be my unwraps as everyone keeps on repeating.

I have baked the lighting using my own uvw and one time with the autogenerated uv's from Unreal. Both uv are extremely different, meaning that if there should be artifacts, they should be very different.

Now here is the interesting find of this test, using either one of these different uv's generates EXACTLY the same artifacts.

Thus, it is NOT my unwraps. My uv's are NOT causing this!!!

But now the question is of course, then what the hell is causing this?

avatar image WixZ Aug 03 '16 at 06:36 PM

here is another prop having the same issue

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avatar image tiago.delgrossi Aug 04 '16 at 08:27 AM


We will have to wait then for some lightmap wizard to show up and teach us both how to solve it :) Sorry for not being that helpful. Cheers

avatar image WixZ Aug 06 '16 at 01:21 PM

Yeah i really need a solution for this issue. I'm stuck and i can't continue making more props if they all have the same issue.

I really hope someone can help us out. :(

avatar image WixZ Aug 10 '16 at 11:27 AM

I'm still having this issue. If someone knows something about it or has any tips that i can try it would be very helpful.

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