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Unity models import mess up lighting

I am trying to import some assets from Unity (Horror Mansion Pack) and all goes well until I build the lighting. After that I get the results in the screenshots.

Any idea why this happens and how to fix it?alt text

Product Version: UE 4.18
capture.png (777.3 kB)
capture2.png (649.5 kB)
02.png (1.1 MB)
capture3.png (850.0 kB)
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asked Mar 03 '18 at 01:51 AM in Using UE4

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avatar image GIGA-Money Mar 03 '18 at 04:13 AM

Well, did you ever run these through a DCC program (Maya,max,blender)? looks like the light map on the UV is messed up. https://docs.unrealengine.com/latest/INT/Engine/Content/SpeedTree/ComputingLightmapUVs/ look in to this topic more.

avatar image Enraged91 Mar 04 '18 at 12:43 AM

No I'm not too familiar with those programs. The author told me before hand I can use them for UE4 pretty easily without needing to modify them.

I can't seem to figure out how to reset the lightmap as the link says.

For some reason when I import them as skeletal meshes the issue goes away.

avatar image GIGA-Money Mar 05 '18 at 04:05 PM

Well that's not good, that means your static meshes will have data loaded for a skeleton and eat your frames if you let it. I fell like some problems could be solved if I where just there.

avatar image Enraged91 Mar 06 '18 at 03:52 AM

Yeah I definitely can't use them as skeletals. I was hoping that could be a clue to figure out the issue but I'm still no closer it seems.

Perhaps I could share one of the meshes with you and you could take a look?

avatar image GIGA-Money Mar 06 '18 at 03:26 PM

Sorry I'm just a one guy, wish i could help better, I'm still learning my self.

avatar image Makigirl Mar 06 '18 at 03:43 PM

I could take a look in a few hours if it's good for you...

avatar image Enraged91 Mar 07 '18 at 01:11 AM

I'd appreciate any help you could offer on this. Below is a link to one of the arches.


avatar image Makigirl Mar 07 '18 at 01:24 AM


Sadly the mesh is not "Unreal ready"! :S Although it has 2 uv channels but non of them is good for lightmap! Both of them have overlapping faces... even Unreal can't generate a usable lightmap from those! If you're familiar with a 3d software you can make your own lightmap uvs for those meshes... Like this they will only work with dynamic lighting...

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